Bulk Cover Fixing for KEPUB?

CirrusGear · 02-03-2026, 08:17 PM

Is there a way to bulk edit kepub files in such a way that I don't have to edit them individually? To be more clear, I have found that to make covers not stretch after being converted by Calibre I have to by hand go into editing the file by search and replacing "preserveAspectRatio='none'" with "preserveAspectRatio='xMidYMid meet'" on each titlepage.xhtml for each book.

Can I do this in bulk or do I have to do this by hand each book?

theducks · 02-04-2026, 02:03 PM

Try Polish(ing) a book. I believe that uses SVG covers.

Do a 'test' Polish (the hand broom icon) on a known NOT right book, then check the titlepage.xhtml (or the designated cover) file.
If tat does what you want

BULK MODE the next run

JSWolf · 02-04-2026, 03:35 PM

Quote:

Originally Posted by CirrusGear

Is there a way to bulk edit kepub files in such a way that I don't have to edit them individually? To be more clear, I have found that to make covers not stretch after being converted by Calibre I have to by hand go into editing the file by search and replacing "preserveAspectRatio='none'" with "preserveAspectRatio='xMidYMid meet'" on each titlepage.xhtml for each book.

Can I do this in bulk or do I have to do this by hand each book?

Use the KoboTouch driver to convert to KePub as you send to your Kobo. There is an option to in the Collections, covers, & uploads tab to Keep cover aspect ratio. You need to be using calibre 8.16.2 or 9.1.

02-03-2026, 08:17 PM	#1
CirrusGear Junior Member Posts: 1 Karma: 10 Join Date: Apr 2025 Device: Kobo Clara Colour	Bulk Cover Fixing for KEPUB? Is there a way to bulk edit kepub files in such a way that I don't have to edit them individually? To be more clear, I have found that to make covers not stretch after being converted by Calibre I have to by hand go into editing the file by search and replacing "preserveAspectRatio='none'" with "preserveAspectRatio='xMidYMid meet'" on each titlepage.xhtml for each book. Can I do this in bulk or do I have to do this by hand each book?

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02-04-2026, 02:03 PM	#2
theducks Well trained by Cats Posts: 31,492 Karma: 62503914 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Try Polish(ing) a book. I believe that uses SVG covers. Do a 'test' Polish (the hand broom icon) on a known NOT right book, then check the titlepage.xhtml (or the designated cover) file. If tat does what you want BULK MODE the next run

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