Kindle Display Error with EPUB - Need Help

archz2 · 08-21-2026, 10:41 AM

I compiled various blog posts into a single document using MS Word, then converted it to EPUB format using Calibre. However, when I transferred the file to my Kindle Paperwhite, I encountered an issue. Clicking on any entry in the table of contents results in an "Error: This page cannot be displayed" message.

To troubleshoot, I downloaded and installed Sigil for the first time and opened the problematic EPUB file. Sigil automatically performed some fixes upon opening. I also used the following options:
1) "Restructure EPUB to Sigil norm"
2) "Mend and prettify all HTML files"

Despite these efforts, I'm still experiencing the same problem on my Kindle device. I transfer the epub via 'send to kindle' web option on Amazon website.

Can anyone help me resolve this issue?

The epub can be downloaded from here.

https://www.dropbox.com/scl/fi/cyrfx...=q9xfbw2p&dl=0

I also tried restarting my device and opening the compilation again. Buts still no success.

JSWolf · 08-21-2026, 10:50 AM

Do you realize Kindles cannot handle ePub unless you've jailbroken and installed KOReader?

Sirtel · 08-21-2026, 11:36 AM

Quote:

Originally Posted by JSWolf

Do you realize Kindles cannot handle ePub unless you've jailbroken and installed KOReader?

They used Send to Kindle.

archz2 · 08-21-2026, 11:58 AM

Quote:

Originally Posted by Sirtel

They used Send to Kindle.

Yes. Exactly.

j.p.s · 08-21-2026, 01:44 PM

Quote:

Originally Posted by Sirtel

They used Send to Kindle.

And did a great job burying that information.

JSWolf · 08-21-2026, 01:53 PM

The problem is that almost every HTML file is too large are too large except for the cover. That's 45 HTML files that are too large. Some are way too large. They need to be split into smaller files. Use the calibre error checker in the editor to see which files are too large and to see when they are no longer too large after you split them. I don't know if Sigil's error checker checks if the HTML files are too large or not.

After the cover, the ToC is 1.1MB. The next file is 931.3KB Followed by 458.8KB, 479.5KB, and 1.8MB. Every HTML file except the cover is too large.

DNSB · 08-21-2026, 02:30 PM

One issue causing those oversized files that JSWolf is complaining about is that every image is included a base64 encoded version of the image in the alt="..." segment. Removing the content of the alt= reduced the file size from 53.5 MB to 14.0 MB.

The error that seems to be the most likely cause of your issues shows when you run epubcheck or epubveri on the ePub. There are multiple errors about the nav document not being in the order and others about fragment identifiers referenced in the nav document not being defined.

I've attached the modded ePub which produced identical error reports to the unmodified and the epubcheck and epubveri outputs. I've also included some of the lines from the epubcheck report in the spoilers.

Another potential issue is that you used webp images and I'm not certain how Amazon's conversion pipeline handles those.

Spoiler:

OEBPS/Text/nav.xhtml 157 7479 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X0dce444ea9d124e72c9ee2823 25c8c325280546" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 447 21688 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X1f64865891f7ea36eba820863 477cefcd2cbdca" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 479 23488 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X384b717af6d3020d8b32ad42c f6fd340e279674" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 489 24029 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X39aa61bc6f6f81c52b39f7cd6 1721be7f44e3c1" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 951 44071 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X3e15e724eb8f0642a1838c12c 0b933d9a0e4832" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 1485 70768 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X475013a60bed319587fea0c47 8297a5ddf2c307" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 559 27271 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X47fac2f9796165ee0aa8609d6 194814db425beb" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 1525 72851 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X4ad34d4c2ba10e30fbebdd23d 8b6fb80a473fcc" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 1115 52193 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X62c867598233c944059bbbfe2 c83d9a739ea30e" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 319 15235 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X6b440bd81eb34acde2e8532df 6e7b2f987d58a8" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 1579 75641 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X6e10f01d83b9501dea37902cc df25134c888653" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 723 35271 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X7263fd0120c386138710eeed9 ff1b4aed59c476" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 749 36519 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X7a1be41279f0d2c65110fbbaf 3492b6cb4a7a9c" is before the previous link’s target in spine order.
OEBPS/Text/nav.xhtml 235 11057 Col: 88: WARNING(NAV-011): "toc" nav must be in reading order; link target "OEBPS/Text/index_split_000.html#id_X892fe686ff6daf8770623e8d6 e651927210f01d" is before the previous link’s target in spine order.

Spoiler:

JSWolf · 08-21-2026, 05:33 PM

Both the Kindle and send-to-kindle do not handle webp images.

With this ePub, I was able to find some issues with epubveri. It's since been updated.

archz2 · Yesterday, 05:13 AM

Quote:

Originally Posted by DNSB

every image is included a base64 encoded version of the image in the alt="..." segment. Removing the content of the alt= reduced the file size from 53.5 MB to 14.0 MB.

That's a radical scaling down of filesize!! What's the process of removing content of alt? Any automated method to do it?

Quote:

Originally Posted by DNSB

The error that seems to be the most likely cause of your issues shows when you run epubcheck or epubveri on the ePub. There are multiple errors about the nav document not being in the order and others about fragment identifiers referenced in the nav document not being defined.

What is the nav document in my file? I did not change any order or anything about fragment identifiers. I don't know anything about these things. What and how did these things changed?

Quote:

Originally Posted by DNSB

Another potential issue is that you used webp images and I'm not certain how Amazon's conversion pipeline handles those.

These blog posts were saved as html, then converted to docx files (using the attached doccy combiner.py) and compiled into one single docx file. I used the script html_to_doc_converter.py (attached in this post.) I did not touch the images at all. Whatever default images were there on the original web pages, they were retained like that.

Here's the log to the conversion using default settings. Split files larger than limit was set to 500 KB

I got this error log

---------

Code:

calibre, version 9.13.0
ERROR: Conversion failed: <p><b>Failed to convert: The Unintuitive Blog Collection<p>
                Many older e-book reader devices are incapable of displaying
                EPUB files that have internal components over a certain size.
                Therefore, when converting to EPUB, calibre automatically tries
                to split up the EPUB into smaller sized pieces.  For some
                files that are large undifferentiated blocks of text, this
                splitting fails.
                <p>You can <b>work around the problem</b> by either increasing the
                maximum split size under <i>EPUB output</i> in the conversion dialog,
                or by turning on Heuristic processing, also in the conversion
                dialog. Note that if you make the maximum split size too large,
                your e-book reader may have trouble with the EPUB.
                        

Convert book 1 of 1 (The Unintuitive Blog Collection)
Conversion options changed from defaults:
  unwrap_lines: False
  enable_heuristics: True
  flow_size: 500
  markup_chapter_headings: False
  output_profile: 'generic_eink'
  renumber_headings: False
  italicize_common_cases: False
  read_metadata_from_opf: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\3i8jhtsx.opf'
  fix_indents: False
  verbose: 2
  cover: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\7r99k7r7.jpeg'
  filter_css: ',color,background-color,background'
Resolved conversion options
calibre version: 9.13.0
{'add_alt_text_to_img': False,
 'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': 'original',
 'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
            "'\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', "
            "'i')) or @class = 'chapter']",
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\7r99k7r7.jpeg',
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'docx_inline_subsup': False,
 'docx_no_cover': False,
 'docx_no_pagebreaks_between_notes': False,
 'dont_split_on_page_breaks': False,
 'duplicate_links_in_toc': False,
 'embed_all_fonts': False,
 'embed_font_family': None,
 'enable_heuristics': True,
 'epub_flatten': False,
 'epub_inline_toc': False,
 'epub_max_image_size': 'none',
 'epub_toc_at_end': False,
 'epub_version': '2',
 'expand_css': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': ',color,background-color,background',
 'fix_indents': False,
 'flow_size': 500,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x00000206144B17F0>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': False,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': False,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.GenericEink object at 0x00000206144B2CF0>,
 'page_breaks_before': '/',
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\3i8jhtsx.opf',
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': False,
 'replace_scene_breaks': '',
 'search_replace': '[]',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
 'sr2_replace': None,
 'sr2_search': None,
 'sr3_replace': None,
 'sr3_search': None,
 'start_reading_at': None,
 'subset_embedded_fonts': False,
 'tags': None,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'toc_title': None,
 'transform_css_rules': '[]',
 'transform_html_rules': '[]',
 'unsmarten_punctuation': False,
 'unwrap_lines': False,
 'use_auto_toc': False,
 'verbose': 2}
InputFormatPlugin: DOCX Input running
on C:\Users\swooshycloud\AppData\Local\Temp\calibre-8rudw8zr\ssohxcgy.docx
Converting Word markup to HTML
Converting styles to CSS
Cleaning up redundant markup generated by Word
Generating Table of Contents from headings
Parsing all content...
Parsing docx.css ...
Parsing index.html ...
*********  Heuristic processing HTML  *********
There are 882 blank lines. 0.11808809746954077 percent blank
Hard line breaks check returned False
Median line length is 591, calculated with html format
Fixing hyphenated content
Formatting scene breaks
Initial parse failed, using more forgiving parsers
Parsing index.html as HTML
Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
	Detected chapter: Artbook Download
	Detected chapter: Workbook Download
Flattening CSS and remapping font sizes...
Filtering CSS properties: , color, background-color, background
Source base font size is 11.00000pt
Removing fake margins...
Found 6456 items of level: p_1
Found 946 items of level: p_5
Found 2 items of level: div_1
Found 2 items of level: div_5
Found 2 items of level: div_6
Ignoring level div_5
Ignoring level div_6
p_1  left margin stats: Counter({'0': 5844, '24pt': 612})
p_1  right margin stats: Counter({'0': 5844, '24pt': 612})
p_5  left margin stats: Counter({'0': 946})
p_5  right margin stats: Counter({'0': 946})
div_1  left margin stats: Counter()
div_1  right margin stats: Counter()
Cleaning up manifest...
Trimming unused files from manifest...
Creating EPUB Output...
Splitting markup on page breaks and flow limits, if any...
		Splitting on page-break at id=calibre_pb_0
		Splitting on page-break at id=calibre_pb_1
	Looking for large trees in index.html...
	Found large tree #0
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[2537]
			Split tree still too large: 13884.20703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[1496]
			Split tree still too large: 8173.7548828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[736]
			Split tree still too large: 2559.84375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[496]
			Split tree still too large: 1619.3974609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[270]
			Split tree still too large: 1025.615234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[178]
			Split tree still too large: 687.90625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[113]
			Committed sub-tree #1 (230.6767578125 KB)
			Committed sub-tree #2 (457.58203125 KB)
			Committed sub-tree #3 (338.0615234375 KB)
			Split tree still too large: 594.134765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[144]
			Committed sub-tree #4 (282.1640625 KB)
			Committed sub-tree #5 (312.3232421875 KB)
			Split tree still too large: 940.798828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[150]
			Split tree still too large: 548.3720703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[105]
			Committed sub-tree #6 (480.60546875 KB)
			Committed sub-tree #7 (68.119140625 KB)
			Committed sub-tree #8 (392.779296875 KB)
			Split tree still too large: 5614.263671875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[513]
			Split tree still too large: 3927.5 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[267]
			Split tree still too large: 1107.546875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[168]
			Committed sub-tree #9 (477.796875 KB)
			Split tree still too large: 630.1025390625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[85]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[89]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[48]
			Committed sub-tree #10 (96.98828125 KB)
			Split tree still too large: 533.482421875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[52]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}hr /*/*[2]/*[41]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[24]
			Committed sub-tree #11 (131.3984375 KB)
			Committed sub-tree #12 (402.4521484375 KB)
			Split tree still too large: 2820.3056640625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[135]
			Split tree still too large: 1537.958984375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[71]
			Split tree still too large: 1226.9599609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[18]
			Committed sub-tree #13 (87.0869140625 KB)
			Split tree still too large: 1140.2255859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[53]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[28]
			Committed sub-tree #14 (89.451171875 KB)
			Split tree still too large: 1051.134765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[13]/*/*/*[2]/*
Adjusted split point to ancestor
			Committed sub-tree #15 (127.1728515625 KB)
			Split tree still too large: 924.40625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[8]
			Split tree still too large: 805.30859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[5]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[4]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[6]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[3]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[7]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[2]
			Split tree too small
		Splitting...
Traceback (most recent call last):
  File "runpy.py", line 203, in _run_module_as_main
  File "runpy.py", line 88, in _run_code
  File "site.py", line 83, in <module>
  File "site.py", line 78, in main
  File "site.py", line 50, in run_entry_point
  File "calibre\utils\ipc\worker.py", line 185, in main
  File "calibre\gui2\convert\gui_conversion.py", line 61, in gui_convert_override
  File "calibre\gui2\convert\gui_conversion.py", line 36, in gui_convert
  File "calibre\ebooks\conversion\plumber.py", line 1450, in run
  File "calibre\ebooks\conversion\plugins\epub_output.py", line 239, in convert
  File "calibre\ebooks\oeb\transforms\split.py", line 77, in __call__
  File "calibre\ebooks\oeb\transforms\split.py", line 86, in split_item
  File "calibre\ebooks\oeb\transforms\split.py", line 254, in __init__
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  [Previous line repeated 5 more times]
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  [Previous line repeated 3 more times]
  File "calibre\ebooks\oeb\transforms\split.py", line 376, in split_to_size
calibre.ebooks.oeb.transforms.split.SplitError: Could not find reasonable point at which to split: index.html Sub-tree size: 805 KB

-----------------

Then I had to choose heuristics option and then I got this error.

Code:

calibre, version 9.13.0
ERROR: Conversion failed: <p><b>Failed to convert: The Unintuitive Blog Collection<p>
                Many older e-book reader devices are incapable of displaying
                EPUB files that have internal components over a certain size.
                Therefore, when converting to EPUB, calibre automatically tries
                to split up the EPUB into smaller sized pieces.  For some
                files that are large undifferentiated blocks of text, this
                splitting fails.
                <p>You can <b>work around the problem</b> by either increasing the
                maximum split size under <i>EPUB output</i> in the conversion dialog,
                or by turning on Heuristic processing, also in the conversion
                dialog. Note that if you make the maximum split size too large,
                your e-book reader may have trouble with the EPUB.
                        

Convert book 1 of 1 (The Unintuitive Blog Collection)
Conversion options changed from defaults:
  renumber_headings: False
  filter_css: ',color,background-color,background'
  unwrap_lines: False
  enable_heuristics: True
  flow_size: 500
  output_profile: 'generic_eink'
  italicize_common_cases: False
  read_metadata_from_opf: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\mpaqgpcm.opf'
  verbose: 2
  cover: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\ou8gmdx_.jpeg'
Resolved conversion options
calibre version: 9.13.0
{'add_alt_text_to_img': False,
 'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': 'original',
 'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
            "'\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', "
            "'i')) or @class = 'chapter']",
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\ou8gmdx_.jpeg',
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'docx_inline_subsup': False,
 'docx_no_cover': False,
 'docx_no_pagebreaks_between_notes': False,
 'dont_split_on_page_breaks': False,
 'duplicate_links_in_toc': False,
 'embed_all_fonts': False,
 'embed_font_family': None,
 'enable_heuristics': True,
 'epub_flatten': False,
 'epub_inline_toc': False,
 'epub_max_image_size': 'none',
 'epub_toc_at_end': False,
 'epub_version': '2',
 'expand_css': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': ',color,background-color,background',
 'fix_indents': True,
 'flow_size': 500,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x000001789FEE17F0>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': False,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.GenericEink object at 0x000001789FEE2CF0>,
 'page_breaks_before': '/',
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\mpaqgpcm.opf',
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': False,
 'replace_scene_breaks': '',
 'search_replace': '[]',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
 'sr2_replace': None,
 'sr2_search': None,
 'sr3_replace': None,
 'sr3_search': None,
 'start_reading_at': None,
 'subset_embedded_fonts': False,
 'tags': None,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'toc_title': None,
 'transform_css_rules': '[]',
 'transform_html_rules': '[]',
 'unsmarten_punctuation': False,
 'unwrap_lines': False,
 'use_auto_toc': False,
 'verbose': 2}
InputFormatPlugin: DOCX Input running
on C:\Users\swooshycloud\AppData\Local\Temp\calibre-8rudw8zr\x4eq43_l.docx
Converting Word markup to HTML
Converting styles to CSS
Cleaning up redundant markup generated by Word
Generating Table of Contents from headings
Parsing all content...
Parsing docx.css ...
Parsing index.html ...
*********  Heuristic processing HTML  *********
There are 882 blank lines. 0.11808809746954077 percent blank
minimum chapters required are: 18
found 676 pre-existing headings
Total wordcount is: 260124, Average words per section is: 384, Marked up 676 chapters
Hard line breaks check returned False
Median line length is 591, calculated with html format
Fixing hyphenated content
Formatting scene breaks
Initial parse failed, using more forgiving parsers
Parsing index.html as HTML
Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
	Detected chapter: Artbook Download
	Detected chapter: Workbook Download
Flattening CSS and remapping font sizes...
Filtering CSS properties: , color, background, background-color
Source base font size is 11.00000pt
Removing fake margins...
Found 6456 items of level: p_1
Found 946 items of level: p_5
Found 2 items of level: div_1
Found 2 items of level: div_5
Found 2 items of level: div_6
Ignoring level div_5
Ignoring level div_6
p_1  left margin stats: Counter({'0': 5844, '24pt': 612})
p_1  right margin stats: Counter({'0': 5844, '24pt': 612})
p_5  left margin stats: Counter({'0': 946})
p_5  right margin stats: Counter({'0': 946})
div_1  left margin stats: Counter()
div_1  right margin stats: Counter()
Cleaning up manifest...
Trimming unused files from manifest...
Creating EPUB Output...
Splitting markup on page breaks and flow limits, if any...
		Splitting on page-break at id=calibre_pb_0
		Splitting on page-break at id=calibre_pb_1
	Looking for large trees in index.html...
	Found large tree #0
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[2537]
			Split tree still too large: 13884.20703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[1496]
			Split tree still too large: 8173.7548828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[736]
			Split tree still too large: 2559.84375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[496]
			Split tree still too large: 1619.3974609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[270]
			Split tree still too large: 1025.615234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[178]
			Split tree still too large: 687.90625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[113]
			Committed sub-tree #1 (230.6767578125 KB)
			Committed sub-tree #2 (457.58203125 KB)
			Committed sub-tree #3 (338.0615234375 KB)
			Split tree still too large: 594.134765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[144]
			Committed sub-tree #4 (282.1640625 KB)
			Committed sub-tree #5 (312.3232421875 KB)
			Split tree still too large: 940.798828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[150]
			Split tree still too large: 548.3720703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[105]
			Committed sub-tree #6 (480.60546875 KB)
			Committed sub-tree #7 (68.119140625 KB)
			Committed sub-tree #8 (392.779296875 KB)
			Split tree still too large: 5614.263671875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[513]
			Split tree still too large: 3927.5 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[267]
			Split tree still too large: 1107.546875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[168]
			Committed sub-tree #9 (477.796875 KB)
			Split tree still too large: 630.1025390625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[85]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[89]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[48]
			Committed sub-tree #10 (96.98828125 KB)
			Split tree still too large: 533.482421875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[52]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}hr /*/*[2]/*[41]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[24]
			Committed sub-tree #11 (131.3984375 KB)
			Committed sub-tree #12 (402.4521484375 KB)
			Split tree still too large: 2820.3056640625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[135]
			Split tree still too large: 1537.958984375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[71]
			Split tree still too large: 1226.9599609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[18]
			Committed sub-tree #13 (87.0869140625 KB)
			Split tree still too large: 1140.2255859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[53]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[28]
			Committed sub-tree #14 (89.451171875 KB)
			Split tree still too large: 1051.134765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[13]/*/*/*[2]/*
Adjusted split point to ancestor
			Committed sub-tree #15 (127.1728515625 KB)
			Split tree still too large: 924.40625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[8]
			Split tree still too large: 805.30859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[5]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[4]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[6]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[3]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[7]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[2]
			Split tree too small
		Splitting...
Traceback (most recent call last):
  File "runpy.py", line 203, in _run_module_as_main
  File "runpy.py", line 88, in _run_code
  File "site.py", line 83, in <module>
  File "site.py", line 78, in main
  File "site.py", line 50, in run_entry_point
  File "calibre\utils\ipc\worker.py", line 185, in main
  File "calibre\gui2\convert\gui_conversion.py", line 61, in gui_convert_override
  File "calibre\gui2\convert\gui_conversion.py", line 36, in gui_convert
  File "calibre\ebooks\conversion\plumber.py", line 1450, in run
  File "calibre\ebooks\conversion\plugins\epub_output.py", line 239, in convert
  File "calibre\ebooks\oeb\transforms\split.py", line 77, in __call__
  File "calibre\ebooks\oeb\transforms\split.py", line 86, in split_item
  File "calibre\ebooks\oeb\transforms\split.py", line 254, in __init__
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  [Previous line repeated 5 more times]
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  [Previous line repeated 3 more times]
  File "calibre\ebooks\oeb\transforms\split.py", line 376, in split_to_size
calibre.ebooks.oeb.transforms.split.SplitError: Could not find reasonable point at which to split: index.html Sub-tree size: 805 KB

-------------

Then i increased the split size to 700kb and got this error.

Code:

Convert book 1 of 1 (The Unintuitive Blog Collection)
Conversion options changed from defaults:
  filter_css: ',color,background-color,background'
  renumber_headings: False
  unwrap_lines: False
  enable_heuristics: True
  flow_size: 700
  output_profile: 'generic_eink'
  italicize_common_cases: False
  read_metadata_from_opf: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\sosu9gqv.opf'
  verbose: 2
  cover: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\qj5qu3x7.jpeg'
Resolved conversion options
calibre version: 9.13.0
{'add_alt_text_to_img': False,
 'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': 'original',
 'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
            "'\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', "
            "'i')) or @class = 'chapter']",
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\qj5qu3x7.jpeg',
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'docx_inline_subsup': False,
 'docx_no_cover': False,
 'docx_no_pagebreaks_between_notes': False,
 'dont_split_on_page_breaks': False,
 'duplicate_links_in_toc': False,
 'embed_all_fonts': False,
 'embed_font_family': None,
 'enable_heuristics': True,
 'epub_flatten': False,
 'epub_inline_toc': False,
 'epub_max_image_size': 'none',
 'epub_toc_at_end': False,
 'epub_version': '2',
 'expand_css': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': ',color,background-color,background',
 'fix_indents': True,
 'flow_size': 700,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x000001F7719517F0>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': False,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.GenericEink object at 0x000001F771952CF0>,
 'page_breaks_before': '/',
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\sosu9gqv.opf',
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': False,
 'replace_scene_breaks': '',
 'search_replace': '[]',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
 'sr2_replace': None,
 'sr2_search': None,
 'sr3_replace': None,
 'sr3_search': None,
 'start_reading_at': None,
 'subset_embedded_fonts': False,
 'tags': None,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'toc_title': None,
 'transform_css_rules': '[]',
 'transform_html_rules': '[]',
 'unsmarten_punctuation': False,
 'unwrap_lines': False,
 'use_auto_toc': False,
 'verbose': 2}
InputFormatPlugin: DOCX Input running
on C:\Users\swooshycloud\AppData\Local\Temp\calibre-8rudw8zr\jquvpip7.docx
Converting Word markup to HTML
Converting styles to CSS
Cleaning up redundant markup generated by Word
Generating Table of Contents from headings
Parsing all content...
Parsing docx.css ...
Parsing index.html ...
*********  Heuristic processing HTML  *********
There are 882 blank lines. 0.11808809746954077 percent blank
minimum chapters required are: 18
found 676 pre-existing headings
Total wordcount is: 260124, Average words per section is: 384, Marked up 676 chapters
Hard line breaks check returned False
Median line length is 591, calculated with html format
Fixing hyphenated content
Formatting scene breaks
Initial parse failed, using more forgiving parsers
Parsing index.html as HTML
Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
	Detected chapter: Artbook Download
	Detected chapter: Workbook Download
Flattening CSS and remapping font sizes...
Filtering CSS properties: , background-color, color, background
Source base font size is 11.00000pt
Removing fake margins...
Found 6456 items of level: p_1
Found 946 items of level: p_5
Found 2 items of level: div_1
Found 2 items of level: div_5
Found 2 items of level: div_6
Ignoring level div_5
Ignoring level div_6
p_1  left margin stats: Counter({'0': 5844, '24pt': 612})
p_1  right margin stats: Counter({'0': 5844, '24pt': 612})
p_5  left margin stats: Counter({'0': 946})
p_5  right margin stats: Counter({'0': 946})
div_1  left margin stats: Counter()
div_1  right margin stats: Counter()
Cleaning up manifest...
Trimming unused files from manifest...
Creating EPUB Output...
Splitting markup on page breaks and flow limits, if any...
		Splitting on page-break at id=calibre_pb_0
		Splitting on page-break at id=calibre_pb_1
	Looking for large trees in index.html...
	Found large tree #0
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[2537]
			Split tree still too large: 13884.20703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[1496]
			Split tree still too large: 8173.7548828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[736]
			Split tree still too large: 2559.84375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[496]
			Split tree still too large: 1619.3974609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[270]
			Split tree still too large: 1025.615234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[178]
			Committed sub-tree #1 (687.90625 KB)
			Committed sub-tree #2 (338.0615234375 KB)
			Committed sub-tree #3 (594.134765625 KB)
			Split tree still too large: 940.798828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[150]
			Committed sub-tree #4 (548.3720703125 KB)
			Committed sub-tree #5 (392.779296875 KB)
			Split tree still too large: 5614.263671875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[513]
			Split tree still too large: 3927.5 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[267]
			Split tree still too large: 1107.546875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[168]
			Committed sub-tree #6 (477.796875 KB)
			Committed sub-tree #7 (630.1025390625 KB)
			Split tree still too large: 2820.3056640625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[135]
			Split tree still too large: 1537.958984375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[71]
			Split tree still too large: 1226.9599609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[18]
			Committed sub-tree #8 (87.0869140625 KB)
			Split tree still too large: 1140.2255859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[53]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[28]
			Committed sub-tree #9 (89.451171875 KB)
			Split tree still too large: 1051.134765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[13]/*/*/*[2]/*
Adjusted split point to ancestor
			Committed sub-tree #10 (127.1728515625 KB)
			Split tree still too large: 924.40625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[8]
			Split tree still too large: 805.30859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[5]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[4]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[6]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[3]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[7]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[2]
			Split tree too small
		Splitting...
Traceback (most recent call last):
  File "runpy.py", line 203, in _run_module_as_main
  File "runpy.py", line 88, in _run_code
  File "site.py", line 83, in <module>
  File "site.py", line 78, in main
  File "site.py", line 50, in run_entry_point
  File "calibre\utils\ipc\worker.py", line 185, in main
  File "calibre\gui2\convert\gui_conversion.py", line 61, in gui_convert_override
  File "calibre\gui2\convert\gui_conversion.py", line 36, in gui_convert
  File "calibre\ebooks\conversion\plumber.py", line 1450, in run
  File "calibre\ebooks\conversion\plugins\epub_output.py", line 239, in convert
  File "calibre\ebooks\oeb\transforms\split.py", line 77, in __call__
  File "calibre\ebooks\oeb\transforms\split.py", line 86, in split_item
  File "calibre\ebooks\oeb\transforms\split.py", line 254, in __init__
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  [Previous line repeated 5 more times]
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 395, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  File "calibre\ebooks\oeb\transforms\split.py", line 383, in split_to_size
  [Previous line repeated 3 more times]
  File "calibre\ebooks\oeb\transforms\split.py", line 376, in split_to_size
calibre.ebooks.oeb.transforms.split.SplitError: Could not find reasonable point at which to split: index.html Sub-tree size: 805 KB

If I change the split size to 900kb, the conversion happens eventually. But it gives the same error in Kindle paperwhite as mentioned in the original post.

Here's the log file.

Code:

Convert book 1 of 1 (The Unintuitive Blog Collection)
Conversion options changed from defaults:
  filter_css: ',color,background-color,background'
  renumber_headings: False
  unwrap_lines: False
  enable_heuristics: True
  flow_size: 900
  output_profile: 'generic_eink'
  italicize_common_cases: False
  read_metadata_from_opf: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\wu4536m1.opf'
  verbose: 2
  cover: 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\s_u1vrny.jpeg'
Resolved conversion options
calibre version: 9.13.0
{'add_alt_text_to_img': False,
 'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': 'original',
 'chapter': "//*[((name()='h1' or name()='h2') and re:test(., "
            "'\\s*((chapter|book|section|part)\\s+)|((prolog|prologue|epilogue)(\\s+|$))', "
            "'i')) or @class = 'chapter']",
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\s_u1vrny.jpeg',
 'debug_pipeline': None,
 'dehyphenate': True,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': False,
 'docx_inline_subsup': False,
 'docx_no_cover': False,
 'docx_no_pagebreaks_between_notes': False,
 'dont_split_on_page_breaks': False,
 'duplicate_links_in_toc': False,
 'embed_all_fonts': False,
 'embed_font_family': None,
 'enable_heuristics': True,
 'epub_flatten': False,
 'epub_inline_toc': False,
 'epub_max_image_size': 'none',
 'epub_toc_at_end': False,
 'epub_version': '2',
 'expand_css': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': ',color,background-color,background',
 'fix_indents': True,
 'flow_size': 900,
 'font_size_mapping': None,
 'format_scene_breaks': True,
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x0000019504B717F0>,
 'insert_blank_line': False,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': False,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': None,
 'level2_toc': None,
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.GenericEink object at 0x0000019504B72CF0>,
 'page_breaks_before': '/',
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'C:\\Users\\swooshycloud\\AppData\\Local\\Temp\\calibre-8rudw8zr\\wu4536m1.opf',
 'remove_fake_margins': True,
 'remove_first_image': False,
 'remove_paragraph_spacing': False,
 'remove_paragraph_spacing_indent_size': 1.5,
 'renumber_headings': False,
 'replace_scene_breaks': '',
 'search_replace': '[]',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
 'sr2_replace': None,
 'sr2_search': None,
 'sr3_replace': None,
 'sr3_search': None,
 'start_reading_at': None,
 'subset_embedded_fonts': False,
 'tags': None,
 'timestamp': None,
 'title': None,
 'title_sort': None,
 'toc_filter': None,
 'toc_threshold': 6,
 'toc_title': None,
 'transform_css_rules': '[]',
 'transform_html_rules': '[]',
 'unsmarten_punctuation': False,
 'unwrap_lines': False,
 'use_auto_toc': False,
 'verbose': 2}
InputFormatPlugin: DOCX Input running
on C:\Users\swooshycloud\AppData\Local\Temp\calibre-8rudw8zr\v081ttdj.docx
Converting Word markup to HTML
Converting styles to CSS
Cleaning up redundant markup generated by Word
Generating Table of Contents from headings
Parsing all content...
Parsing docx.css ...
Parsing index.html ...
*********  Heuristic processing HTML  *********
There are 882 blank lines. 0.11808809746954077 percent blank
minimum chapters required are: 18
found 676 pre-existing headings
Total wordcount is: 260124, Average words per section is: 384, Marked up 676 chapters
Hard line breaks check returned False
Median line length is 591, calculated with html format
Fixing hyphenated content
Formatting scene breaks
Initial parse failed, using more forgiving parsers
Parsing index.html as HTML
Reading TOC from NCX...
Merging user specified metadata...
Detecting structure...
	Detected chapter: Artbook Download
	Detected chapter: Workbook Download
Flattening CSS and remapping font sizes...
Filtering CSS properties: , background-color, color, background
Source base font size is 11.00000pt
Removing fake margins...
Found 6456 items of level: p_1
Found 946 items of level: p_5
Found 2 items of level: div_1
Found 2 items of level: div_5
Found 2 items of level: div_6
Ignoring level div_6
Ignoring level div_5
p_1  left margin stats: Counter({'0': 5844, '24pt': 612})
p_1  right margin stats: Counter({'0': 5844, '24pt': 612})
p_5  left margin stats: Counter({'0': 946})
p_5  right margin stats: Counter({'0': 946})
div_1  left margin stats: Counter()
div_1  right margin stats: Counter()
Cleaning up manifest...
Trimming unused files from manifest...
Creating EPUB Output...
Splitting markup on page breaks and flow limits, if any...
		Splitting on page-break at id=calibre_pb_0
		Splitting on page-break at id=calibre_pb_1
	Looking for large trees in index.html...
	Found large tree #0
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[2537]
			Split tree still too large: 13884.20703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[1496]
			Split tree still too large: 8173.7548828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[736]
			Split tree still too large: 2559.84375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[496]
			Split tree still too large: 1619.3974609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[270]
			Split tree still too large: 1025.615234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[178]
			Committed sub-tree #1 (687.90625 KB)
			Committed sub-tree #2 (338.0615234375 KB)
			Committed sub-tree #3 (594.134765625 KB)
			Split tree still too large: 940.798828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[150]
			Committed sub-tree #4 (548.3720703125 KB)
			Committed sub-tree #5 (392.779296875 KB)
			Split tree still too large: 5614.263671875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[513]
			Split tree still too large: 3927.5 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[267]
			Split tree still too large: 1107.546875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[168]
			Committed sub-tree #6 (477.796875 KB)
			Committed sub-tree #7 (630.1025390625 KB)
			Split tree still too large: 2820.3056640625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[135]
			Split tree still too large: 1537.958984375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[71]
			Split tree still too large: 1226.9599609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[18]
			Committed sub-tree #8 (87.0869140625 KB)
			Split tree still too large: 1140.2255859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[53]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[28]
			Committed sub-tree #9 (89.451171875 KB)
			Split tree still too large: 1051.134765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[13]/*/*/*[2]/*
Adjusted split point to ancestor
			Committed sub-tree #10 (127.1728515625 KB)
			Split tree still too large: 924.40625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[8]
			Committed sub-tree #11 (805.30859375 KB)
			Committed sub-tree #12 (119.4501953125 KB)
			Committed sub-tree #13 (311.3515625 KB)
			Split tree still too large: 1282.69921875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[70]
			Split tree still too large: 1058.8212890625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[69]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[66]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}hr /*/*[2]/*[65]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[33]
			Committed sub-tree #14 (366.8203125 KB)
			Committed sub-tree #15 (692.376953125 KB)
			Committed sub-tree #16 (224.23046875 KB)
			Split tree still too large: 1687.1162109375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[151]
			Split tree still too large: 957.443359375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[96]
			Committed sub-tree #17 (538.4052734375 KB)
			Committed sub-tree #18 (419.390625 KB)
			Committed sub-tree #19 (730.025390625 KB)
			Split tree still too large: 5710.8046875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[554]
			Split tree still too large: 3505.7255859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[259]
			Split tree still too large: 1734.3662109375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[122]
			Split tree still too large: 1050.890625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[48]
			Committed sub-tree #20 (522.9970703125 KB)
			Committed sub-tree #21 (528.24609375 KB)
			Committed sub-tree #22 (683.828125 KB)
			Split tree still too large: 1771.7119140625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[133]
			Committed sub-tree #23 (434.986328125 KB)
			Split tree still too large: 1337.078125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[82]
			Committed sub-tree #24 (330.3193359375 KB)
			Split tree still too large: 1007.111328125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[55]
			Committed sub-tree #25 (119.9052734375 KB)
			Committed sub-tree #26 (887.55859375 KB)
			Split tree still too large: 2205.431640625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[182]
			Split tree still too large: 1026.169921875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[114]
			Committed sub-tree #27 (588.54296875 KB)
			Committed sub-tree #28 (437.9794921875 KB)
			Split tree still too large: 1179.6142578125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[226]
			Committed sub-tree #29 (373.1748046875 KB)
			Committed sub-tree #30 (806.7919921875 KB)
			Split tree still too large: 29425.1767578125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[900]
			Split tree still too large: 3708.244140625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[479]
			Split tree still too large: 2077.404296875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[231]
			Split tree still too large: 1231.326171875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[115]
			Committed sub-tree #31 (735.6923828125 KB)
			Committed sub-tree #32 (495.986328125 KB)
			Committed sub-tree #33 (846.4306640625 KB)
			Split tree still too large: 1631.1923828125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[238]
			Committed sub-tree #34 (885.5830078125 KB)
			Committed sub-tree #35 (745.9619140625 KB)
			Split tree still too large: 25717.28515625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[400]
			Split tree still too large: 6815.869140625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[296]
			Split tree still too large: 1297.724609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[174]
			Committed sub-tree #36 (670.0107421875 KB)
			Committed sub-tree #37 (628.06640625 KB)
			Split tree still too large: 5518.4970703125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[80]
			Split tree still too large: 1724.8837890625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[65]
			Committed sub-tree #38 (113.2236328125 KB)
			Split tree still too large: 1612.0126953125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[9]
			Committed sub-tree #39 (632.2802734375 KB)
			Split tree still too large: 980.0849609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[6]
			Committed sub-tree #40 (624.49609375 KB)
			Committed sub-tree #41 (355.94140625 KB)
			Split tree still too large: 3793.9658203125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[14]
			Split tree still too large: 2002.9443359375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[8]
			Split tree still too large: 1014.7607421875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[6]
			Committed sub-tree #42 (716.3515625 KB)
			Committed sub-tree #43 (298.76171875 KB)
			Split tree still too large: 988.5361328125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #44 (759.265625 KB)
			Committed sub-tree #45 (229.623046875 KB)
			Split tree still too large: 1791.3740234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Committed sub-tree #46 (870.06640625 KB)
			Split tree still too large: 921.66015625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #47 (605.7138671875 KB)
			Committed sub-tree #48 (316.298828125 KB)
			Split tree still too large: 18901.7685546875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[51]
			Split tree still too large: 8946.126953125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[27]
			Split tree still too large: 4890.392578125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[15]
			Split tree still too large: 2486.171875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[9]
			Split tree still too large: 1458.5830078125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #49 (812.2958984375 KB)
			Committed sub-tree #50 (646.6396484375 KB)
			Split tree still too large: 1027.94140625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #51 (679.2255859375 KB)
			Committed sub-tree #52 (349.068359375 KB)
			Split tree still too large: 2404.5732421875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Split tree still too large: 1057.86328125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #53 (652.8037109375 KB)
			Committed sub-tree #54 (405.412109375 KB)
			Split tree still too large: 1347.0625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #55 (894.5146484375 KB)
			Committed sub-tree #56 (452.900390625 KB)
			Split tree still too large: 4056.0869140625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[13]
			Split tree still too large: 2211.8583984375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Split tree still too large: 1039.91796875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #57 (667.7177734375 KB)
			Committed sub-tree #58 (372.552734375 KB)
			Split tree still too large: 1172.29296875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #59 (829.2998046875 KB)
			Committed sub-tree #60 (343.345703125 KB)
			Split tree still too large: 1844.5810546875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Split tree still too large: 928.625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #61 (615.5966796875 KB)
			Committed sub-tree #62 (313.380859375 KB)
			Split tree still too large: 916.30859375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #63 (725.3505859375 KB)
			Committed sub-tree #64 (191.310546875 KB)
			Split tree still too large: 9955.994140625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[27]
			Split tree still too large: 5009.373046875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[15]
			Split tree still too large: 2806.81640625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[9]
			Split tree still too large: 1442.2783203125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #65 (549.2646484375 KB)
			Committed sub-tree #66 (893.3662109375 KB)
			Split tree still too large: 1364.890625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Split tree still too large: 1035.4990234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[3]
			Committed sub-tree #67 (568.494140625 KB)
			Committed sub-tree #68 (467.357421875 KB)
			Committed sub-tree #69 (329.744140625 KB)
			Split tree still too large: 2202.9091796875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Split tree still too large: 1185.98046875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Split tree still too large: 909.5693359375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[3]
			Committed sub-tree #70 (575.283203125 KB)
			Committed sub-tree #71 (334.638671875 KB)
			Committed sub-tree #72 (276.763671875 KB)
			Split tree still too large: 1017.28125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #73 (687.4326171875 KB)
			Committed sub-tree #74 (330.201171875 KB)
			Split tree still too large: 4946.9736328125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[13]
			Split tree still too large: 2574.5107421875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Split tree still too large: 1205.8984375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #75 (829.2451171875 KB)
			Committed sub-tree #76 (377.005859375 KB)
			Split tree still too large: 1368.96484375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Split tree still too large: 902.4677734375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[3]
			Committed sub-tree #77 (440.166015625 KB)
			Committed sub-tree #78 (462.654296875 KB)
			Committed sub-tree #79 (466.849609375 KB)
			Split tree still too large: 2372.8154296875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[7]
			Split tree still too large: 1131.015625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Committed sub-tree #80 (747.8740234375 KB)
			Committed sub-tree #81 (383.494140625 KB)
			Split tree still too large: 1242.15234375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[5]
			Split tree still too large: 983.2607421875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[3]
			Committed sub-tree #82 (488.615234375 KB)
			Committed sub-tree #83 (494.998046875 KB)
			Committed sub-tree #84 (259.244140625 KB)
	Found large tree #1
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[595]
			Split tree still too large: 2589.6875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[383]
			Split tree still too large: 1923.904296875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[156]
			Split tree still too large: 1454.91015625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[68]
			Committed sub-tree #1 (734.4599609375 KB)
			Committed sub-tree #2 (720.802734375 KB)
			Committed sub-tree #3 (469.3466796875 KB)
			Committed sub-tree #4 (666.1357421875 KB)
			Split tree still too large: 3671.17578125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[365]
			Split tree still too large: 1884.0634765625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[120]
			Split tree still too large: 1291.6142578125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[39]
			Committed sub-tree #5 (117.8388671875 KB)
			Split tree still too large: 1174.1279296875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[49]
			Committed sub-tree #6 (663.4345703125 KB)
			Committed sub-tree #7 (511.0458984375 KB)
			Committed sub-tree #8 (592.8017578125 KB)
			Split tree still too large: 1787.46484375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[177]
			Committed sub-tree #9 (451.349609375 KB)
			Split tree still too large: 1336.4677734375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[72]
			Committed sub-tree #10 (324.103515625 KB)
			Split tree still too large: 1012.716796875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[38]
			Committed sub-tree #11 (6.560546875 KB)
			Split tree still too large: 1006.5087890625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[14]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[15]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[9]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}div /*/*[2]/*[35]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}hr /*/*[2]/*[26]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}hr /*/*[2]/*[34]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}hr /*/*[2]/*[8]
			Split tree too small
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}p /*/*[2]/*[21]/*/*/*[1]/*
Adjusted split point to ancestor
			Committed sub-tree #12 (236.5146484375 KB)
			Committed sub-tree #13 (770.4013671875 KB)
	Found large tree #2
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[1757]
			Split tree still too large: 2473.2734375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h4 /*/*[2]/*[576]
			Split tree still too large: 1571.068359375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[296]
			Split tree still too large: 942.517578125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[140]
			Committed sub-tree #1 (394.6474609375 KB)
			Committed sub-tree #2 (548.22265625 KB)
			Committed sub-tree #3 (628.9033203125 KB)
			Split tree still too large: 902.5576171875 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[710]
			Committed sub-tree #4 (483.0546875 KB)
			Committed sub-tree #5 (419.85546875 KB)
			Split tree still too large: 3972.861328125 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h2 /*/*[2]/*[840]
			Split tree still too large: 2131.22265625 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[502]
			Committed sub-tree #6 (701.490234375 KB)
			Split tree still too large: 1430.0849609375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[146]
			Committed sub-tree #7 (781.1279296875 KB)
			Committed sub-tree #8 (649.3095703125 KB)
			Split tree still too large: 1841.9912109375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h1 /*/*[2]/*[171]
			Split tree still too large: 1126.5927734375 KB
		Splitting...
			Split point: {http://www.w3.org/1999/xhtml}h3 /*/*[2]/*[97]
			Committed sub-tree #9 (309.40234375 KB)
			Committed sub-tree #10 (817.54296875 KB)
			Committed sub-tree #11 (715.7509765625 KB)
	Split into 108 parts
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EPUB output written to C:\Users\swooshycloud\AppData\Local\Temp\calibre-8rudw8zr\px_ihqdx.epub

How should I resolve this conversion now so that the resultant epub file opens properly on my Kindle Paperwhite device?

Here's the dropbox link to the docx file.
https://www.dropbox.com/scl/fi/7kboi...=f84peipf&dl=0

shamanNS · Yesterday, 10:23 AM

Why would you "flatten" source HTML into Word document if the end result needs to be HTML inside epub / zip archive? Combine the source HTML pages / files into an epub with something like EpubPress:

https://epub.press/

Since those blog posts of yours have decent number of images you would probably have to resort to self-hosting EpubPress server component to be able to increase the number of images limit and possibly even number of web pages limit.

I did that (self-host server + use JavaScript client library in NodeJS) when I "compiled" for offline reading on my Kindle Tor.com re-reading blog posts for Malazan and for Stormlight Archive.

DNSB · Yesterday, 11:18 AM

Quote:

Originally Posted by archz2

That's a radical scaling down of filesize!! What's the process of removing content of alt? Any automated method to do it?

In Sigil, I did a search and replace with Regex enabled (remove the ' around the search/replace terms).

Search: 'webp" alt="data:image/webp;base64,.*?" class='
Replace: 'webp" alt="" class='

Quote:

Originally Posted by archz2

What is the nav document in my file? I did not change any order or anything about fragment identifiers. I don't know anything about these things. What and how did these things changed?

In an ePub3, the navagation document is a HTML file. In your ebook, it is called nav.xhtml. An ePub2 uses a NCX file as the navigation document with a default name of toc.ncx. Most times, an ePub3 will have a toc.ncx for backwards compatibility. As why and how these things changed? Very likely the conversion from HTML to docx and then to ePub in calibre.

Quote:

Originally Posted by archz2

These blog posts were saved as html, then converted to docx files (using the attached doccy combiner.py) and compiled into one single docx file. I used the script html_to_doc_converter.py (attached in this post.) I did not touch the images at all. Whatever default images were there on the original web pages, they were retained like that.

Why not just stuff the HTML into a .zip file in order and then convert that to ePub. I suspect this would give a cleaner result.

Quote:

Originally Posted by archz2

How should I resolve this conversion now so that the resultant epub file opens properly on my Kindle Paperwhite device?

Here's the dropbox link to the docx file.
https://www.dropbox.com/scl/fi/7kboi...=f84peipf&dl=0

You are going to have to experiment a bit with your workflow. Either combining all the HTML files into a .zip file and let calibre do the conversion or shamanNS' suggestion as starting points.

Most of my conversions from docx to ePub have been author created documents and I have spend quite a bit of time teaching them how to use styles to ensure a decent conversion process.

DNSB · Yesterday, 02:40 PM

Babysitting this morning and since they are napping, took 30 minutes to take a look at your .docx file.

Downloaded the .docx file and opened in LibreOffice to cleanup some issues.
Imported the docx file into calibre and converted to ePub (I have calibre set to allow extremely large files so only 3 output files.
Opened the ePub with Sigil and ran epubcheck and epubveri. Way to many non-existent ID error, etc.
Combined the HTML files into 1 file and used search and replace to add a Sigil split marker (<hr class="sigil_split_marker" />) before each h1.
Split the file at the markers. This gave me 69 files.
Removed all the IDs associated with the h1-h4 tags.
Generated a new ToC which automatically put a sigil toc id for 2nd, etc. headers in a chapter.
The ToC included h1-h4 and was rather large but functional.
Regenerated the ToC using only h1. Generated a HTML ToC from that to replace the existing one.
Regenerated the ToC using the h1-h4 headers. Generated a NCX file for ePub2 users (habit)
Used calibre to convert the ePub to azw3. Close to 350MB due to the collection of images which ended up as a mix of png, jpeg and svg. Copied it to a Kindle PW4 and the ToC seems to work.
Uploaded the azw3 to Google Drive. See link below.
Need to hurry now since someone is starting their wakeup grumbling.

BOSS - python-docx.azw3

Let me know how it works for your Kindle.

Quoth · Yesterday, 03:45 PM

Copy & paste from web pages into LibreOffice Writer.
save as odt
Edit & fix styles, headings etc. Generate TOC. Make sure no heading use List styles.
No webp
All image anchors as characters.

Also Save as 2007 docx
Convert with Calibre. You might have to edit image CSS for size.

DNSB · Yesterday, 05:40 PM

That's an easier way to do it but again styles are a critical component.

I looked at but didn't bother to fix every image being in a table.

In this case, the mess was existing and I cleaned it up a bit. Took me back to the first few times I got manuscripts to be made ready for publication from authors who knew nothing about using styles with a word processor document. "You mean you don't create paragraph indents by using spaces?"

Quoth · Today, 04:41 AM

Quote:

Originally Posted by DNSB

That's an easier way to do it but again styles are a critical component.

I looked at but didn't bother to fix every image being in a table.

In this case, the mess was existing and I cleaned it up a bit. Took me back to the first few times I got manuscripts to be made ready for publication from authors who knew nothing about using styles with a word processor document. "You mean you don't create paragraph indents by using spaces?"

Yes to all those points!

Glass typewriter syndrome.

Even Epoc Office (Psion and some Nokia Communicators) has real styles -> doc LibreOffice -> odt & docx 2007 -> Calibre epub. The CSS is 1:1

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08-21-2026, 10:41 AM	#1
archz2 Connoisseur Posts: 83 Karma: 4102 Join Date: Jun 2018 Device: Kindle Paperwhite (10th gen) - 6", OnePlus 9RT - MoonReader Pro	Kindle Display Error with EPUB - Need Help I compiled various blog posts into a single document using MS Word, then converted it to EPUB format using Calibre. However, when I transferred the file to my Kindle Paperwhite, I encountered an issue. Clicking on any entry in the table of contents results in an "Error: This page cannot be displayed" message. To troubleshoot, I downloaded and installed Sigil for the first time and opened the problematic EPUB file. Sigil automatically performed some fixes upon opening. I also used the following options: 1) "Restructure EPUB to Sigil norm" 2) "Mend and prettify all HTML files" Despite these efforts, I'm still experiencing the same problem on my Kindle device. I transfer the epub via 'send to kindle' web option on Amazon website. Can anyone help me resolve this issue? The epub can be downloaded from here. https://www.dropbox.com/scl/fi/cyrfx...=q9xfbw2p&dl=0 I also tried restarting my device and opening the compilation again. Buts still no success.

08-21-2026, 10:50 AM	#2
JSWolf Resident Curmudgeon Posts: 84,619 Karma: 153744815 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Do you realize Kindles cannot handle ePub unless you've jailbroken and installed KOReader?

08-21-2026, 01:53 PM	#6
JSWolf Resident Curmudgeon Posts: 84,619 Karma: 153744815 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	The problem is that almost every HTML file is too large are too large except for the cover. That's 45 HTML files that are too large. Some are way too large. They need to be split into smaller files. Use the calibre error checker in the editor to see which files are too large and to see when they are no longer too large after you split them. I don't know if Sigil's error checker checks if the HTML files are too large or not. After the cover, the ToC is 1.1MB. The next file is 931.3KB Followed by 458.8KB, 479.5KB, and 1.8MB. Every HTML file except the cover is too large. Last edited by JSWolf; 08-21-2026 at 02:00 PM.

08-21-2026, 05:33 PM	#8
JSWolf Resident Curmudgeon Posts: 84,619 Karma: 153744815 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	Both the Kindle and send-to-kindle do not handle webp images. With this ePub, I was able to find some issues with epubveri. It's since been updated. Last edited by JSWolf; 08-21-2026 at 05:36 PM.

Yesterday, 10:23 AM	#10
shamanNS Wizard Posts: 1,206 Karma: 12360292 Join Date: Feb 2010 Location: Serbia Device: Kindle PW5, Kobo Libra 2, Kindle PW1	Why would you "flatten" source HTML into Word document if the end result needs to be HTML inside epub / zip archive? Combine the source HTML pages / files into an epub with something like EpubPress: https://epub.press/ Since those blog posts of yours have decent number of images you would probably have to resort to self-hosting EpubPress server component to be able to increase the number of images limit and possibly even number of web pages limit. I did that (self-host server + use JavaScript client library in NodeJS) when I "compiled" for offline reading on my Kindle Tor.com re-reading blog posts for Malazan and for Stormlight Archive.

Yesterday, 02:40 PM	#12
DNSB Bibliophagist Posts: 53,984 Karma: 182150291 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	Babysitting this morning and since they are napping, took 30 minutes to take a look at your .docx file. Downloaded the .docx file and opened in LibreOffice to cleanup some issues. Imported the docx file into calibre and converted to ePub (I have calibre set to allow extremely large files so only 3 output files. Opened the ePub with Sigil and ran epubcheck and epubveri. Way to many non-existent ID error, etc. Combined the HTML files into 1 file and used search and replace to add a Sigil split marker (<hr class="sigil_split_marker" />) before each h1. Split the file at the markers. This gave me 69 files. Removed all the IDs associated with the h1-h4 tags. Generated a new ToC which automatically put a sigil toc id for 2nd, etc. headers in a chapter. The ToC included h1-h4 and was rather large but functional. Regenerated the ToC using only h1. Generated a HTML ToC from that to replace the existing one. Regenerated the ToC using the h1-h4 headers. Generated a NCX file for ePub2 users (habit) Used calibre to convert the ePub to azw3. Close to 350MB due to the collection of images which ended up as a mix of png, jpeg and svg. Copied it to a Kindle PW4 and the ToC seems to work. Uploaded the azw3 to Google Drive. See link below. Need to hurry now since someone is starting their wakeup grumbling. BOSS - python-docx.azw3 Let me know how it works for your Kindle.

Yesterday, 03:45 PM	#13
Quoth Still reading Posts: 15,639 Karma: 114630515 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	Copy & paste from web pages into LibreOffice Writer. save as odt Edit & fix styles, headings etc. Generate TOC. Make sure no heading use List styles. No webp All image anchors as characters. Also Save as 2007 docx Convert with Calibre. You might have to edit image CSS for size.

Yesterday, 05:40 PM	#14
DNSB Bibliophagist Posts: 53,984 Karma: 182150291 Join Date: Jul 2010 Location: Vancouver Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos	That's an easier way to do it but again styles are a critical component. I looked at but didn't bother to fix every image being in a table. In this case, the mess was existing and I cleaned it up a bit. Took me back to the first few times I got manuscripts to be made ready for publication from authors who knew nothing about using styles with a word processor document. "You mean you don't create paragraph indents by using spaces?"