Send "Custom metadata" to device/disk

shuvashish76 · 03-20-2025, 10:49 PM

I don't want to touch "Tags" generated by Calibre when downloading metadata, so that's the reason for my "custom_tags" metadata. Also I do have various other custom ones e.g. pages, words, edition, reading_status etc.
But when I send files to my Kobo no such custom metadata are included in .metadata.calibre file.
How do I send send them via the .metadata.calibre file so that it can be analyzed and take advantage of it on our reader e.g. KOReader ?

kovidgoyal · 03-20-2025, 11:54 PM

the metadata will be present in the actual files themselves. metadata.calibre is for calibre internal use only and you cant control what goes in it.

shuvashish76 · 03-21-2025, 01:39 AM

Yes I can use Edit book feature of Calibre and view the metadata included in content.opf of ebup/azw3.
But the (custom)metadata are written into all type of files, including pdf, zip, even DRM protected files? If yes how do I verify it?

kovidgoyal · 03-21-2025, 02:24 AM

metadata is written into every file format that supports it.

shuvashish76 · 03-21-2025, 05:07 AM

Reported for KOReader. Things are now bit clear to me. Hopefully we'll have some better standard way of handling metadata that can be read by third-party readers in future. Thanks for the info.

03-20-2025, 10:49 PM	#1
shuvashish76 Zealot Posts: 126 Karma: 665010 Join Date: Jan 2022 Location: India Device: Kobo Clara BW	Send "Custom metadata" to device/disk I don't want to touch "Tags" generated by Calibre when downloading metadata, so that's the reason for my "custom_tags" metadata. Also I do have various other custom ones e.g. pages, words, edition, reading_status etc. But when I send files to my Kobo no such custom metadata are included in .metadata.calibre file. How do I send send them via the .metadata.calibre file so that it can be analyzed and take advantage of it on our reader e.g. KOReader ?

03-21-2025, 01:39 AM	#3
shuvashish76 Zealot Posts: 126 Karma: 665010 Join Date: Jan 2022 Location: India Device: Kobo Clara BW	Yes I can use Edit book feature of Calibre and view the metadata included in content.opf of ebup/azw3. But the (custom)metadata are written into all type of files, including pdf, zip, even DRM protected files? If yes how do I verify it? Last edited by shuvashish76; 03-21-2025 at 01:58 AM.

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03-20-2025, 11:54 PM	#2
kovidgoyal creator of calibre Posts: 45,609 Karma: 28549044 Join Date: Oct 2006 Location: Mumbai, India Device: Various	the metadata will be present in the actual files themselves. metadata.calibre is for calibre internal use only and you cant control what goes in it.

03-21-2025, 02:24 AM	#4
kovidgoyal creator of calibre Posts: 45,609 Karma: 28549044 Join Date: Oct 2006 Location: Mumbai, India Device: Various	metadata is written into every file format that supports it.

03-21-2025, 05:07 AM	#5
shuvashish76 Zealot Posts: 126 Karma: 665010 Join Date: Jan 2022 Location: India Device: Kobo Clara BW	Reported for KOReader. Things are now bit clear to me. Hopefully we'll have some better standard way of handling metadata that can be read by third-party readers in future. Thanks for the info.