Calibre is a free and open-source ebook management application created by Kovid Goyal and maintained by a community of contributors since 2006. It organizes large ebook collections with metadata, covers and tags; converts between formats like EPUB, MOBI, AZW3 and PDF; and syncs books directly to e-reader devices such as Kindle and Kobo. It also includes a built-in ebook viewer, an ebook editor for tweaking EPUB files, and a news-download feature that can fetch and convert web content into ebook format.
Calibre vs. Kindle's Built-In Library App
Amazon's Kindle app and device software manage books tied to your Amazon account, but they don't handle format conversion or libraries sourced from outside Amazon. Calibre fills that gap: it can take an EPUB purchased elsewhere and convert it to a Kindle-compatible format, manage metadata across your entire collection regardless of source, and works as a universal library manager rather than being tied to one retailer's ecosystem.
Calibre Features
- Library Management — organizes ebooks with covers, metadata, tags and custom columns
- Format Conversion — converts between EPUB, MOBI, AZW3, PDF and many other ebook formats
- E-Reader Sync — transfers books directly to devices like Kindle and Kobo
- Built-In Ebook Viewer — reads books directly inside Calibre
- Ebook Editor — edits EPUB and other ebook files' text, styles and structure
- News Download (Fetch News) — downloads and converts online news sources into ebook format
- Metadata Fetching — pulls cover art and book details automatically from online sources
- Content Server — hosts your library over a local network for browser or app access
How to Install Calibre on Windows, macOS or Linux
- Download the installer for your OS from the official link on this page or calibre-ebook.com.
- Run the installer (.exe on Windows, .dmg on macOS, or the Linux install script) and follow the prompts.
- Launch Calibre and choose a location for your ebook library on first run.
- Add your existing ebooks using "Add books" to build your library.
- Connect an e-reader via USB if you want to sync books directly to a device.
Is Calibre really free?
Open Source. Calibre is free and open source, released under the GPL, with no paid tier or license fee; development is supported by user donations.
How to download Calibre safely
Use the request button on this page and we will email you the current link for calibre-ebook.com — the publisher's own website — so you receive the authentic build. We do not host, mirror, patch or repackage this software in any way.
Avoid third-party "download manager" sites offering Calibre. They commonly wrap the genuine installer in their own bundler, which is how adware and browser hijackers get onto a machine that the user believed was clean.
Alternatives to Calibre
Other free office software worth comparing before you decide:
SumatraPDF
Lightweight open-source viewer for PDF, EPUB and more.
Frequently asked questions
Is Calibre completely free?
Yes, Calibre is free and open source with no premium version.
Can Calibre convert to and from Kindle formats?
Yes, it supports conversion to and from MOBI and AZW3, among many other formats, though some newer DRM-protected Kindle formats require additional tools to handle.
Does Calibre remove DRM from ebooks?
Calibre itself does not remove DRM; DRM removal typically requires separate plugins and is only legal in certain jurisdictions for content you own.
Can I use Calibre to read news as ebooks?
Yes, its "Fetch news" feature downloads articles from supported sources and converts them into an ebook you can read offline.
Does Calibre work on Linux?
Yes, Calibre has official builds for Windows, macOS and Linux.
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