APK Signer Pro

Sign Android APKs Easily & Securely

An open-source Android toolkit for signing, verifying, extracting, backing up, and managing APK packages directly on your device.

APK Signer Pro combines advanced APK signing capabilities with a modern interface built using Kotlin and Jetpack Compose.

• v1 APK Signing: Legacy JAR-based APK signing for older Android versions.
• v2 APK Signing & Verification: Full-file binary integrity protection for Android 7.0+.
• v3 APK Signing & Verification: Key rotation and cryptographic lineage support for Android 9.0+.
• v4 APK Signing: Streaming signature generation with .apk.idsig support for Android 11.0+.
• 16KB & 4KB Page Alignment: Aligns native .so libraries and resources.arsc for modern Android compatibility.
• Multi-Format Keystores: Supports JKS, PKCS12, BKS, BKS-V1, UBER, and BCFKS.
• Built-in Debug Key: Quickly sign applications using standard Android Studio debug credentials.
• Certificate Inspection: View certificate algorithm, validity, subject, issuer, and SHA-256 fingerprint.
• Persistent Credentials: Save key associations for faster signing without repeated prompts.

• APK Backup & Extraction: Back up and extract APKs from installed user and system applications.
• Split APK Support: Handle split APK packages and .apks files.
• XAPK Support: Work with XAPK packages alongside standard APK and APKS files.
• APK Management: Install, share, copy paths, and remove generated packages.
• Signing History: Keep track of previous signing operations.
• Search & Filtering: Quickly find records and installed applications.
• Organized Storage: Automatically organize signed packages and backups.

• Reactive Local Storage: SQLite persistence with Kotlin Flow.
• Secure File Handling: Uses Android's FileProvider and system sharing mechanisms.

APK Signer Pro features a modern interface designed around Material 3 Expressive principles.

• Material 3 Expressive: Modern interface built entirely with Jetpack Compose.
• Dynamic Colors: Adapts to the system wallpaper color palette.
• Light & Dark Themes: Supports system-based theme modes.
• Expressive Loading Indicators: Smooth loading indicators across different screens and actions.
• Pull-to-Refresh: Expressive swipe-to-refresh interactions.
• Collapsing Top App Bars: Smooth nested scrolling across primary screens.
• Live Logs: Colorized signing and execution logs with step indicators.
• One-Tap Log Copying: Quickly copy logs to the clipboard.
• Consistent Empty States: Clean and polished empty-state layouts.
• Responsive Layouts: Designed for a consistent experience across Android devices.
• Multi-language Support: Available in English, Chinese, Russian, Portuguese, French, Spanish, German, and Arabic.

If APK Signer Pro is useful to you, you can support its continued development by buying me a coffee.

Special thanks to the ACS Lite team for making Android development possible directly on mobile.

This project was developed using ACS Lite, allowing the entire application to be built on an Android device without a computer.

This project is licensed under the Apache 2.0 License.