KeyStoreViewer: App Signatures

Inspect app and APK signing certificates, fingerprints, and public keys.

Find the signing information you need for Android apps.

KeyStoreViewer helps developers inspect signing certificates from installed apps and APK files. View MD5, SHA-1, and SHA-256 certificate fingerprints and public key information without digging through command-line output.

KEY FEATURES
• Inspect the signing information of installed apps.
• Open an APK file to view its signing certificates.
• View MD5, SHA-1, and SHA-256 certificate fingerprints.
• View public key information, including the modulus for RSA keys.
• Copy fingerprints and public key values, or share signature details.

BUILT FOR EVERYDAY DEVELOPMENT
• Find the certificate fingerprints required by APIs and third-party SDKs.
• Retrieve signature and public key information for app registration.
• Investigate signing differences between debug and release builds.

Certificate fingerprints identify signing certificates. They are not APK file checksums, and a matching signature alone does not guarantee that an app is safe.

Author: Seiko
License: GNU General Public License v3.0 or later
Issue Tracker
Source Code
Build Metadata
Reproducibility Status

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 1.3.1 (10) suggested Added on Oct 01, 2026

arm64-v8a

This version requires Android 7.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- show notifications
  
  Allows the app to show notifications
- query all packages
  
  Allows an app to see all installed packages.
- run at startup
  
  Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
Download APK 3 MiB PGP Signature | Build Log
Version 1.2.1 (8) - Added on Sep 12, 2026

arm64-v8a

This version requires Android 7.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- view network connections
  
  Allows the app to view information about network connections such as which networks exist and are connected.
- run foreground service
  
  Allows the app to make use of foreground services.
- show notifications
  
  Allows the app to show notifications
- query all packages
  
  Allows an app to see all installed packages.
- run at startup
  
  Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
- prevent phone from sleeping
  
  Allows the app to prevent the phone from going to sleep.
Download APK 3 MiB PGP Signature | Build Log
Version 1.2.0 (7) - Added on Sep 11, 2026

arm64-v8a

This version requires Android 7.0 or newer.

It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.
Permissions
- view network connections
  
  Allows the app to view information about network connections such as which networks exist and are connected.
- run foreground service
  
  Allows the app to make use of foreground services.
- show notifications
  
  Allows the app to show notifications
- query all packages
  
  Allows an app to see all installed packages.
- run at startup
  
  Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
- prevent phone from sleeping
  
  Allows the app to prevent the phone from going to sleep.
Download APK 3 MiB PGP Signature | Build Log

Versions

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