Calibre is the ultimate, open-source e-book library management application designed to take complete control of your digital book collection. Whether you are an avid reader or a casual e-book collector, Calibre provides a powerful, unified interface to organize, convert, sync, and read your e-books across all your devices. It is completely free, actively maintained, and supported by a global community of developers and contributors.
With support for virtually every e-book format and major e-reader devices, Calibre acts as a digital library hub. It allows you to fetch news from the web, convert it into e-book format for offline reading, and even stream your entire library to any web browser or mobile device via its built-in content server. Calibre 9.16.0 introduces significant performance improvements, enhanced PDF input handling, and new accessibility features like high-quality Kokoro text-to-speech voices.
In This Post
How to Maximize It
Calibre Metadata & Cover Art Setup
- Open Calibre and select the book you want to edit.
- Click the Edit metadata button in the toolbar or press Ctrl+Shift+M.
- Edit the title, author, tags, and series information.
- Click the Download cover button to automatically fetch a matching cover from online databases.
- Save the changes to apply them to your e-book file.
Why: Properly tagging and assigning cover art is essential for e-readers like Kindle or Kobo to display your books correctly in their library grids. It keeps your digital library visually organized and professional.
Calibre Recipe Editor for News Download
- Go to the Fetch news menu in the Calibre toolbar.
- Select a news source or click Edit recipes to customize an existing one.
- Use the built-in Recipe Editor to modify HTML/CSS selectors if a website layout has changed.
- Save the recipe and run it to generate a custom e-book newsletter.
- Send the generated e-book directly to your device or save it to your library.
Why: Many news websites block standard automated downloads. Learning to tweak recipes allows you to bypass layout changes and continue fetching your favorite blogs, newspapers, and RSS feeds as custom e-books automatically.
Calibre Conversion Settings for Kindle
- Select the e-books you want to convert in your library.
- Click the Convert books button and choose Bulk conversion.
- In the conversion dialog, set the Output format to MOBI or AZW3.
- Under Look & Feel, enable Font size and set Margin to 0 or 1 to maximize screen space.
- Check EPUB to MOBI conversion options and click OK to convert.
Why: Kindle devices perform best with AZW3 or MOBI formats. Customizing margins and font sizes during conversion ensures that the text fits perfectly on the Kindle screen without awkward line breaks or tiny fonts.
Download Calibre
File size: 200.0 MB
OS support: Windows, macOS
Windows
Download Calibre 9.17.0 for Windows – Installer (Msi)
Download Calibre 9.17.0 for Windows – Portable (Exe)
macOS
Changelog in Recent Version
- Added support for reading images in JPEG XL format.
- Added support for CSS Level 4 selectors.
- Improved MOBI/AZW3/PDB output compression speed.
- Content server and E-book viewer now honor OS prefers-reduced-motion settings.
- Fixed PDF input conversion regression.
- Fixed EPUB 3 conversion navigation markup issues.
- Improved robustness for database-backed data files and notes.
- Updated metadata sources for Amazon and Google Images using camoufox.
Important Features
- E-book Library Management: Calibre serves as a complete e-library manager, allowing you to organize, tag, and search your entire collection of e-books. You can search by title, author, or tags, and manage metadata easily.
- Format Conversion: Convert e-books between virtually all major formats, including EPUB, MOBI, AZW3, PDF, TXT, DOCX, and HTML. You can also convert PDFs, images, and raw text into e-book formats.
- E-Reader Syncing: Sync your e-book library wirelessly or via USB to popular e-reader devices, including Kindle, Kobo, PocketBook, and others. You can send books directly to your device or via email.
- Web News to E-book: Fetch news articles from thousands of online sources, blogs, and newspapers (including The New York Times, The Economist, and Reuters), and automatically convert them into an e-book for offline reading.
- Integrated E-book Viewer: Read your e-books directly within Calibre using the built-in, highly customizable e-book viewer. It supports dark mode, table of contents, search, and full-screen viewing.
- E-book Editor: Create, edit, and customize your own e-books using the built-in book editor. You can modify the HTML, CSS, and structure of EPUB files without needing external tools.
- Content Server: Calibre includes a robust content server that allows you to stream or send your entire library to any web browser or mobile device over a Wi-Fi connection, acting as a personal cloud library.
- Metadata Fetching: Easily fetch and update metadata, covers, and reviews for your books from online databases like Amazon, Goodreads, and Google Books with just a few clicks.
Technical Details
| Software Name | Calibre |
|---|---|
| Version | 9.17.0 |
| License | Open Source |
| File Size | 200.0 MB |
| OS Support | Windows, macOS |
| Language | Multi-language |
| Developer | Kovid Goyal |
| Homepage | https://calibre-ebook.com/ |
| Changelogurl | https://calibre-ebook.com/whats-new |
| Last Updated | October 25, 2026 |
How to Install
Installation Steps
- Download the appropriate installer for your operating system (Windows MSI, macOS DMG, or Linux tarball) from the official GitHub releases page.
- Double-click the downloaded installer file and follow the on-screen setup wizard. On Windows, you can choose between a standard installer or a portable version.
- Launch Calibre from your Start menu, Applications folder, or desktop shortcut. The first launch will prompt you to set up your library folder.
Compatibility: Calibre 9.16.0 is compatible with Windows 10 and 11 (64-bit), macOS 10.14 Mojave and later, and modern Linux distributions.
Questions & Answers
Is Calibre free to download and use?
Yes, Calibre is completely free and open source, licensed under the GPL. You can download it, use it for any purpose, and even modify the source code.
Do I need an internet connection to use Calibre?
Calibre is a local application that runs entirely on your computer. It does not require an internet connection to manage your library, except for specific features like fetching news from the web or syncing with cloud-based readers.
What are the system requirements for Calibre?
Calibre is compatible with Windows 10 and later (64-bit), macOS 10.14 Mojave and later, and Linux (various distributions including Ubuntu, Fedora, and Arch). It requires at least 2 GB of RAM and 150 MB of disk space.
