Caliber is a powerful multi-platform application for reading, processing and managing e-books. It is an indispensable tool for any e-book enthusiast, offering a wide range of options for working with different formats.
The software supports importing and converting numerous formats including CBZ, CBR, CBC, CHM, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC, PDB, PML, RB, RTF, TCR, and TXT. You can then export to formats like EPUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, TCR, and TXT, making it extremely convenient for users of popular e-book readers like Nook or Amazon Kindle.
In This Post
The Winning Edge
Setting Up Your First Library
- Launch Caliber and set your library location
- Add books by importing files or downloading from sources
- Configure automatic metadata fetching in preferences
Explanation: A well-organized library saves hours of manual work and ensures your books are always properly tagged.
Optimizing Conversion Settings
- Select multiple books and click Convert books
- Choose output format (EPUB for most devices, MOBI for Kindle)
- Adjust look-and-feel settings for better readability
Explanation: Proper conversion settings ensure your e-books display correctly on any device while maintaining formatting.
Using the Content Server
- Enable the Content Server in Preferences > Sharing
- Set the port and authentication options
- Access your library from any device via web browser
Explanation: The built-in content server lets you stream your personal library to phones, tablets, and other computers without manual transfers.
Download Caliber
File size: 212 MB
OS support: Windows, Linux
Windows
Caliber 9.9.0 for Windows – x64
Caliber 9.9.0 Portable for Windows
Mac
Linux
Notable Features
- Multi-Format E-Book Conversion: Convert between dozens of e-book formats including EPUB, MOBI, PDF, and more with high quality output and customizable settings.
- Digital Library Management: Organize your entire e-book collection with powerful tagging, sorting, and metadata editing capabilities.
- Metadata Enhancement: Automatically download book information, covers, and metadata from over 150 sources to enrich your library.
- Built-in E-Book Viewer: Read books directly within the application with customizable fonts, margins, and lighting options.
- Cross-Platform Compatibility: Available for Windows, macOS, and Linux operating systems with synchronized library management.
Product Specifications
| Software Name | Caliber |
|---|---|
| Version | 9.9.0 |
| License | Free (Open Source) |
| File Size | 212 MB |
| OS Support | Windows, Linux |
| Language | Multilingual |
| Developer | Kovid Goyal |
| Homepage | https://calibre-ebook.com/ |
| Last Updated | May 29, 2026 |
How to Install
Installation Steps
- Click the download button to get the installer for your operating system
- Locate the downloaded file and double-click to run the installer
- Follow the on-screen installation wizard to complete setup
Compatibility: Compatible with Windows 7 and later versions
Problem Solving
- Issue: Installation fails → Solution: Run as administrator
Questions & Answers
Is Caliber really free to use?
Yes, caliber is completely free and open source software released under the GPLv3 license.
What file formats does Caliber support?
caliber supports over 20 input formats and can convert to EPUB, MOBI, PDF, and other popular e-book formats.
Can I sync my library across devices?
Yes, caliber includes a content server that lets you stream books to any device with a web browser.
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