There is no official version of Calibre for Android, but there are several ways to get your Calibre library onto your Android device. The easiest way is with the officially-sanctioned Calibre Companion app, which can sync your library wirelessly. You can then use an ebook reader app to read your synced books. You can also use the BookFusion plugin to sync your library with BookFusion, which is a free eBook Reader for Android. This guide will teach you how to get Calibre for Android.

Before you start: Ensure your Android device and computer are connected to the same wireless network. You will also need a separate eBook reader app like Moon+ Reader or FBReader if using Calibre Companion.
Warning: Calibre Companion is not a free app and costs $5.99. Ensure you download it from the official Google Play Store to avoid security risks.

How to sync Calibre books to Android

Follow these methods to transfer and read your library on your mobile device.

Method 1: Using Calibre Companion

  • Download and install Calibre Companion from the Google Play Store. It costs $5.99 and is developed by a member of the Calibre team.
  • Open Calibre Companion and tap Continue, then tap Allow to grant storage access.
  • Install a separate eBook reader app. Options include Moon+ Reader, FBReader, AlReader, or Universal Book Reader.
  • Launch Calibre on your computer.
  • Click the Connect/share button (you may need to click >> to see it) and select Start wireless device connection. Allow access through your firewall if prompted.
  • Open Calibre Companion on your Android, tap Connect, and select Wireless Device.
  • In Calibre on your computer, select the books you want to transfer. Right-click the selection and choose Send to device > Send to main memory.
  • Open Calibre Companion on your Android, tap a book, and tap Read to open it in your chosen eBook reader.

Method 2: Using BookFusion and a Plugin

  • Download and install the free BookFusion app from the Google Play Store.
  • Open the app and create an account using email, Google, Facebook, Twitter/X, or Apple.
  • Open Calibre on your computer and go to Preferences > Plugins > Get new plugins.
  • Type “BookFusion” in the filter bar, select BookFusion Cloud & Device Sync, and click Install. Restart Calibre when prompted.
  • Go back to Preferences > Plugins > User interface action and click BookFusion Plugin. Click Customize plugin.
  • Click the link next to “Visit” to open the BookFusion website. Sign in and click Create API key.
  • Copy the generated key, paste it into the API Key field in the Calibre plugin window, and click Ok and Apply.
  • Click the BookFusion icon in the Calibre toolbar. Select Sync all books or select specific books and choose Sync selected books, then click Start.
  • Open the BookFusion app on Android. Tap a synced book, tap Download, and then tap Read.

Method 3: Troubleshooting connection issues

  • Close and reopen the Calibre, Calibre Companion, or BookFusion apps.
  • Verify that your computer and Android device are on the same Wi-Fi network.
  • Check your firewall settings. Open Windows Firewall, click Allow an app or feature through Windows Firewall, and ensure the box next to Calibre is checked.
  • If BookFusion sync fails, generate a new API key in the Calibre plugin settings and update the configuration.
Pro tip: If you have a large library, sync your books in smaller batches to prevent connection timeouts or slow transfer speeds.

Accessing your Calibre library on Android allows you to carry your entire digital reading collection in your pocket without being locked into a specific ecosystem. By using tools like Calibre Companion or BookFusion, you maintain full control over your ebook files, ensuring you can read them on any device regardless of format restrictions.

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These methods also bridge the gap between powerful desktop management and mobile convenience. Whether you prefer a paid, direct sync solution or a free cloud-based approach, setting up this connection ensures you never have to leave a book behind. It enhances your reading flexibility and maximizes the utility of the Calibre software you already use.