Used ZipSigner for Android?
Editors’ Review
Sign APK, ZIP, and JAR files on-device using built-in certificates or a custom keystore, then produce zip-aligned output and verify existing signatures. ZipSigner, from Ken Ellinwood, runs on Android as a compact utility that combines signing, key creation, and a file browser in one interface. Its supported keystore formats include JKS, BKS, and PKCS12, and it works without root. The app targets Android developers, ROM modders, and enthusiasts who need signing without a PC.
Replaces a desktop signing toolchain on a phone
ZipSigner combines the actions normally split between jarsigner, signapk, keytool, and zipalign into a single mobile workflow, which removes the need to move files to a computer. The tool accepts package files, applies a selected certificate or keystore, and writes a signed, aligned output. A built-in file browser presents input and output paths so the user can select flashable ZIPs or APKs from device storage.
Runs on very old and low-end Android devices
The app lists compatibility back to early Android releases, which indicates a low runtime footprint and broad device reach. Because it performs signing and alignment locally, tasks complete without network access. The developer's Java signing library powers the core operations, so the same signing code appears in other Android signing utilities and reproduces desktop signing behavior on handheld hardware.
Provides explicit key management and signature checks
The tool supports custom keystores and can create self-signed certificates, so users can manage private keys on-device rather than relying on built-in test keys. It also verifies existing signatures on files before or after signing, which gives a clear readout of what was present. Those controls give developers direct management over which key signs each package.
Suited for developers and modders, not casual users
The app puts developer-oriented controls on a phone: keystore formats, certificate selection, and manual signature verification require some knowledge of signing concepts. Enthusiasts and ROM builders gain immediate value because they can sign modified packages without a PC. Casual users who only need one-off installs may find keystore handling and certificate choices technical and will need to learn the steps.
Pros
- On-device signing for APK, ZIP and JAR files
- Supports custom keystores: JKS, BKS, PKCS12 formats
- Automatic zip-alignment of signed output files
- Can create keystores and self-signed certificates on-device
Cons
- Requires knowledge of keystore formats to use custom keys
- Android-only tool, not available for desktop workflows
- Built-in certificates are test/system keys, not for production distribution
Bottom Line
A practical on-device signer for technical users
The app is a sound option for developers and modders who need to sign and align packages on Android rather than using a PC. Expect direct control over keys and the responsibility of handling keystore formats correctly; casual users should prepare for a learning curve around certificates and verification. Recommended.
