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Banana Split

Split secrets into QR-code shards using Shamir's Secret Sharing
New in version 0.8.3
• FOSS camera scanner for F-Droid — no more Google ML Kit dependency
• Fix camera activating at app launch instead of only on the Restore tab
• Move fastlane metadata to repo root
Banana Split uses Shamir's Secret Sharing to split secrets into QR-code shards. Any majority of shards can reconstruct the secret — fewer reveal nothing.

How it works

1. Enter your secret (e.g., a seed phrase, private key, password).
2. Choose how many shards to create and how many are required to reconstruct.
3. Use the auto-generated passphrase or enter your own.
4. Banana Split encrypts the secret with the passphrase, then splits the ciphertext into N QR codes using Shamir's scheme.
5. Print or save the QR codes. Write the passphrase by hand on every sheet.

To reconstruct: scan a majority of QR code shards, enter the passphrase, and your secret is restored.

Features

• Offline — all cryptography happens on-device, no server communication
• Save shards as PNGs or PDF with full Unicode font support
• Camera and gallery QR scanning with multi-file import
• Custom or auto-generated passphrases
• User-selectable quorum (how many shards needed)
• 7 languages: English, Russian, Turkish, Belarusian, Georgian, Ukrainian, Polish
• Cross-platform shard compatibility with the Banana Split web app

Security

Encryption: scrypt key derivation + NaCl secretbox (XSalsa20-Poly1305).
Splitting: Shamir's Secret Sharing over GF(256).
No data collection, no analytics, no trackers.

Web App

Also available as a web app — no installation needed: https://nfcarchiver.com/banana/
Shards created in the app and web version are fully compatible.

Open Source

This app is a fork of banana_split by Parity Technologies, licensed under GPLv3.
Source code: https://github.com/mezinster/banana_split
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 0.8.3 (3) suggested Added on Apr 09, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • com.nfcarchiver.banana_split.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 27 MiB PGP Signature | Build Log

    • New in version 0.8.2
    • F-Droid preparation — metadata, screenshots, and build recipe
    • Fork attribution and source code link on About screen
    • Fix scanner state reset on "Start Over"
    • Localization fixes and fastlane metadata for all 7 languages
  • Version 0.8.2 (2) - Added on Apr 08, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.
    • record audio
      This app can record audio using the microphone while the app is in use.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • com.nfcarchiver.banana_split.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 27 MiB PGP Signature | Build Log

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