• Picks
  • Discover
  • Alternatives
  • About

© 2026 Willet

  • Newsletter
  • About
  • FAQ
  • Terms
  • Privacy & Cookies
Join the Discord (opens in a new tab)
Kovid Goyal avatar

calibre

Desktop ebook library for reading, converting, and editing books

  • Media and downloads
  • Productivity
View on GitHub
Website

What it is

A cross-platform ebook manager that catalogs your book collection, converts between formats such as EPUB, MOBI, AZW3 and PDF, and includes a reader and a book editor. It syncs books to e-reader devices like Kindle and Kobo, fetches metadata and covers from online sources, and can turn news websites into ebooks on a schedule. Readers with large personal libraries use it to keep their books organized and readable on any device. It also includes a content server for browsing and reading the library from a web browser.

Images

Facts

Stars
26,199 GitHub stars.
26,199

Forks
2,724
Commits
54,904
Contributors
374
Language
Python
License
GPL-3.0
Last commit
Oct 20, 2026
On GitHub since
May 2013
First release
September 2014
Platforms
macOS, Windows, Linux, CLI, self-hosted
Self-hostable
Yes
Alternative to
Adobe Digital Editions, Kindle
Author
Kovid Goyal
Tags
  • document-management
  • file-conversion
  • ebooks

Last synced from GitHub on Oct 20, 2026

The 10 best overlooked open-source projects, every Monday.

Share and more

Comments

No comments yet. Start the conversation.

Similar projects

  • Readest avatar

    Readest

    An ebook reader for EPUB and PDF that syncs your place across devices

    25.5k
  • Kavita avatar

    Kavita

    A self-hosted library for comics, manga, and ebooks, read in any browser

    11.9k
  • julyX10 avatar

    Lap

    Offline desktop photo manager for very large local libraries

    4k

What people are saying

Updated Oct 21, 2026
  • Hacker NewsCalibre 5.0Sep 25, 2020 · 674 points · 268 comments (opens Hacker News in a new tab)
  • Hacker NewsCalibre 4.0Oct 4, 2019 · 552 points · 302 comments (opens Hacker News in a new tab)
  • Hacker NewsNew in Calibre 6.0Jul 11, 2022 · 446 points · 214 comments (opens Hacker News in a new tab)
  • Hacker NewsCalibre – E-Book ManagementApr 27, 2021 · 340 points · 168 comments (opens Hacker News in a new tab)
  • Hacker NewsCalibre – New in Calibre 7.0Nov 18, 2023 · 307 points · 132 comments (opens Hacker News in a new tab)
  • Hacker NewsCalibre version 1.0 releasedAug 25, 2013 · 313 points · 121 comments (opens Hacker News in a new tab)
  • Hacker NewsCalibre 8.0Mar 21, 2025 · 284 points · 146 comments (opens Hacker News in a new tab)
  • Hacker NewsCalibre 3 releasedJun 16, 2017 · 78 points · 1 comment (opens Hacker News in a new tab)
  • Hacker NewsNew in Calibre 9.0Feb 1, 2026 · 12 points · 0 comments (opens Hacker News in a new tab)
  • Bluesky“ㅤ I just read that ama has bricked some older kindles. you just rent e-books these days. we're reaping the whirlwind. I and others knew for a long time use…”May 25, 2026 · 3 likes · 1 reply (opens Bluesky in a new tab)
  • Hacker NewsCalibre 7.25 ReleasedFeb 7, 2025 · 4 points · 0 comments (opens Hacker News in a new tab)
  • Bluesky“calibre-ebook.com Calibre can help with syncing books to it/converting formats if needed. koreader.rocks Koreader is good for reading ebooks etc locally…”Sep 6, 2026 · 2 likes · 1 reply (opens Bluesky in a new tab)
  • Bluesky“calibre is an e-book manager. It can view, convert, edit and catalog It is cross platform, running on Linux, Windows and macOS.”Dec 25, 2024 · 2 likes · 1 reply (opens Bluesky in a new tab)
  • Hacker NewsCalibre 6.1Jul 25, 2022 · 3 points · 0 comments (opens Hacker News in a new tab)
  • Bluesky“I regret installing this overly feature-rich software”Jun 19, 2026 · 0 likes · 2 replies (opens Bluesky in a new tab)
  • Bluesky“Completely free, and keeps your library organized. Connects to Kindle by USB and transforms e-book formats when necessary. That's to say, you get your e-book…”May 14, 2026 · 0 likes · 2 replies (opens Bluesky in a new tab)
  • Bluesky“I have a Kobo and I've used Calibre to put books from elsewhere onto it. calibre-ebook.com”May 7, 2026 · 1 like · 1 reply (opens Bluesky in a new tab)
  • Bluesky“Calibre is a powerful open-source e-book manager to view, convert, edit & organize books in most formats. Sync with Kindle & manage large libraries easily…”Mar 17, 2026 · 2 likes · 0 replies (opens Bluesky in a new tab)
  • Hacker NewsFree Ebook ConversionSep 18, 2012 · 2 points · 0 comments (opens Hacker News in a new tab)
  • Bluesky“And if you have a bunch of ebooks and audiobooks stuck in your Kindle & Audible accounts, tools exist to liberate them. 🟣 openaudible.org (audiobooks) 🟣…”Jul 1, 2026 · 1 like · 0 replies (opens Bluesky in a new tab)