AAB Signer

AAB Signer is an offline tool for signing Android packages on your device. Pick an APK or AAB, point it at your keystore, and get a signed file back. Everything runs locally and nothing leaves your device.

APK signing uses Google's apksig library and applies v1, v2, and v3 signatures in a single pass. AAB signing produces a JAR-signed bundle ready for Play Console upload.

If you do not have a keystore yet, the built-in keystore creator generates a self-signed JKS or PKCS12 with RSA, EC, or DSA keys. Fill in the certificate fields, choose your key size and validity period, and the file is saved where you choose.

The app also lets you browse every package installed on your device and view its signing certificate, including SHA-1, SHA-256, and MD5 fingerprints. The same certificate inspector works on any APK file you pick from storage.

The app does not have the internet permission and has no ads, no analytics, and no account requirement.

Features:

- Sign APK with v1 + v2 + v3 signatures

- Sign AAB for Play Console upload

- Create JKS or PKCS12 keystores with RSA, EC, or DSA keys

- Browse installed apps and their signing certificates

- Inspect any APK certificate: SHA-1, SHA-256, MD5

- Works completely offline

- Material 3 UI with dark, light, and system theme options