Uber-apk-signer.jar Jun 2026

: Double-check the strings assigned to --ksPass and --ksKeyPass . Typographical errors or trailing spaces will fail authentication.

Assuming you have Java installed, rename or symlink the JAR for convenience: uber-apk-signer.jar

: The tool injects cryptographic signatures into the aligned APK using a specified keystore. : Double-check the strings assigned to --ksPass and

java -jar uber-apk-signer.jar -a myapp.apk java -jar uber-apk-signer

uber-apk-signer is a single executable JAR file (typically named uber-apk-signer-<version>.jar , often aliased to uber-apk-signer.jar ) developed by Patrick Favre-Bulle. It is a that signs APK, AAB (Android App Bundle), and ZIP files using any combination of v1 (JAR signature), v2 (full APK signature), and v3 (Android 9+ signature schemes).

Furthermore, the utility future-proofs the signing process against the evolving landscape of Android security. As Android has matured, so have its signing schemes—moving from the legacy JAR signing (v1) to the more secure APK Signature Scheme v2, v3, and v4. These newer schemes offer faster verification times and stronger integrity guarantees but can be difficult to implement manually. Uber-apk-signer abstracts this complexity away from the user. It intelligently selects the appropriate signature scheme based on the target Android version, ensuring that the application meets modern security standards without requiring the developer to be an expert in cryptographic protocols.

java -jar uber-apk-signer.jar --help