calibre 9.3.0

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Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian.

Manage, convert, sync, and more

Library management. Calibre keeps things orderly by creating single entries for books that contains multiple formats. Add tags and comments for better searchability.
Format conversion. Calibre’s robust conversion options support a wide variety of file formats.
File syncing. Calibre’s device drivers seamlessly support all the top e-readers and devices.

What’s New:

Version 9.3.0:

New features:

Windows installer: Detect running calibre processes and ask user to shutdown calibre before proceeding with installation to avoid reboots post installation
Improve Preferences->Tweaks getting rid of the need for double apply
KEPUB Output: When converting to KEPUB preserve cover aspect ratio regardless of the setting for it in the EPUB Output to match the behavior of KEPUB files from Kobo

Bug fixes:

Make the new pages column value available in save to disk/send to device templates
Hanvon N10 device driver: Fix calibre unable to put its metadata files onto the device
Amazon metadata download plugin: Fix incorrect series index from amazon.com
Fix a regression in calibre 9.0 that broke output to PDB/TCR/zTXT files
Windows: Fix calibre not exiting on quit when the wireless device driver is used in calibre 9
Fix error in page counting when using the calibredb command to add a book
Completion: When sorting completion matches in contains mode ensure matches are sorted first by distance from beginning and then sub-sorted alphabetically
Windows: Fix a regression in calibre 9 that caused tooltips to not follow the color scheme
PDF Input: Fix PDF Outline not being converted to Table of Contents in output document when using the calibre engine
ODT Input: Ensure images are extracted within container (CVE-2026-26064)
PDB Input: Ensure extracted images are within the container (CVE-2026-26065)
Fix a regression in calibre 9.0 that caused a spurious large books merge warning when merging books in the cover grid view
Windows: Fix harmless error popup if user tries to launch calibre multiple times in quick succession