If an APK fails to install after signing, ensure you haven't skipped the zipalign step, which Uber APK Signer performs by default.
The output will be a new file, typically named your-app-aligned-debugSigned.apk , saved in the same directory as the original.
https://github.com/patrick-loder/uber-apk-signer/releases/download/1.2.1/uber-apk-signer.jar
: Can sign an entire folder of APKs with a single command. How to Download and Install
Last updated: 2025. This article reflects uber-apk-signer version 1.3.0. Always check the official GitHub repository for the latest changes. download uber-apk-signer.jar
: Allocate more RAM to the process using the -Xmx flag. For example, to allocate 2 gigabytes of RAM, format your command like this: java -Xmx2g -jar uber-apk-signer.jar --apks /path/to/folder Use code with caution. Verification Fails on Android 11+ Devices
Ensure the original APK compiles successfully before passing it to the signer, and double-check your alias passwords. Conclusion
Locate the version tagged as Latest . Read the release notes to understand any new features or breaking changes. Step 4: Download the Assets
: Modern Android versions strictly enforce v2, v3, or v4 signature schemes. If your APK only uses v1 (Jar Signing), the system will reject it. If an APK fails to install after signing,
The specific password for the key alias (if different from ksPass). --onlyVerify
file, making it platform-independent as long as a Java Runtime Environment (JRE) is installed. A typical command to sign all APKs in a folder is as simple as: java -jar uber-apk-signer.jar --apks /path/to/apks Saves Time : Replaces multiple manual commands with one. : No official graphical user interface (GUI). : Built on official Google signing implementations. Java Dependency : Requires Java to be installed on the system. Batch Processing : Effortlessly handles dozens of APKs at once. Where to Download
: Java is either not installed, or your system's environmental variables are not pointing to the correct Java installation directory.
To sign an entire folder containing multiple APKs, point the tool to the directory instead of a single file: java -jar uber-apk-signer.jar --apks /path/to/apk/folder/ Use code with caution. 3. Signing with a Custom Production Keystore How to Download and Install Last updated: 2025
java -jar uber-apk-signer.jar --apks build/outputs/apk/release/ --ks ci/android.keystore --ksPass $KEYSTORE_PASS --ksAlias release --keyPass $KEY_PASS
: If no release keystore is provided, it automatically signs with a debug key, useful for developer testing. Basic Usage Examples
Elias slumped back in his chair, a laugh escaping his throat—a dry, jagged sound. It was done. The tool had bypassed his broken credentials, generated a fresh temporary key, aligned the data structures for performance, and signed the package. It was a Frankenstein build, using a temporary key, but it would install. It would run.