Calibre is an open source e-book library management application that enables you to manage your e-book collection, convert e-books between different formats, synchronize with popular e-book reader devices, and read your e-books with the included viewer.
It acts as an e-library and also allows for format conversion, news feeds to e-book conversion, as well as e-book reader sync features and an integrated e-book viewer.
Calibre"s features include: library management; format conversion (all major ebook formats); syncing to e-book reader devices; fetching news from the Web and converting it into ebook form; viewing many different e-book formats, giving you access to your book collection over the internet using just a browser.
Calibre 9.3.0 changelog:
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
Improved news sources
- Financial Times
- The Asahi Shimbun
- Todoist
Calibre 9.3.1 changes:
- Version 9.3.1 fixes a regression in the previous release that caused a spurious error message to show when merging books and a regression in calibre 9.0 that broke using textures as the Cover grid background when using the system theme on Windows
Download: Calibre 9.3.1 | Portable | ~200.0 MB (Open Source)
Download: Calibre for MacOS | 323.0 MB
Download: Calibre for Linux
View: Calibre Home Page | Calibre Screenshot
