Security Tool

APK Signature Verifier Online Free — Check APK Safety

Free online APK signature verifier — check signing schemes (V1/V2/V3), certificate details, SHA fingerprints, integrity status, and security score. Verify if APK is safe to install. 100% browser-based, no uploads.

Drag & Drop APK File Here

or click to browse files

Full signature & certificate analysis

Why Verify APK Signatures?

APK signatures ensure that an app comes from its original developer and hasn't been tampered with.

  • Confirm app authenticity & developer identity
  • Detect modified, tampered, or repackaged APKs
  • Verify update compatibility with existing installs
  • Identify V1/V2/V3 signing scheme versions
  • View SHA-1 & SHA-256 certificate fingerprints
  • Check MANIFEST.MF file integrity

APK Signing Schemes

v1
JAR Signing

Original scheme, verifies each ZIP entry. Slower but widely compatible.

v2
APK Signature Scheme v2

Full-APK verification, faster install. Required since Android 7.0+.

v3
APK Signature Scheme v3

Supports key rotation. Available on Android 9.0+.

v4
APK Signature Scheme v4

Streaming install support. Android 11.0+.

Related Tools

APK Info APK Signer Guide XAPK to APK

APK Signature Verifier — Frequently Asked Questions

To verify APK signature online: (1) Go to xapktoapk.com APK Signature Verifier, (2) Drag and drop your APK file onto the upload area, (3) The tool instantly analyzes V1/V2/V3 signing schemes, certificate details, and SHA fingerprints, (4) View the security score and verification results. The entire process runs in your browser — no files are uploaded to any server.

To check if an APK is safe: (1) Use our APK Signature Verifier to check if the APK has a valid signature, (2) Look for V2 or V3 signing scheme presence, (3) Check the security score (70+ indicates a well-signed APK), (4) Compare the SHA-256 certificate fingerprint with the official developer's fingerprint, (5) Additionally, use our APK Info Extractor to review requested permissions before installing.

The APK security score is calculated based on: V1 signature (25 points), V2 signature (35 points), V3 signature (20 points), MANIFEST.MF presence (10 points), and .SF files (10 points). A score of 70+ means "Trusted", 40-69 means "Caution", and below 40 means "Untrusted". Higher V2/V3 presence indicates the APK uses modern security standards.

V1 (JAR Signing): Original scheme that verifies each ZIP entry individually. Slow but compatible with all Android versions. V2 (APK Signature Scheme): Verifies the entire APK as a whole for faster installation; required since Android 7.0 Nougat. V3: Adds key rotation support (Android 9.0 Pie). V4: Enables streaming installs (Android 11.0+). Modern APKs should have at least V1+V2 for maximum compatibility.

No. Our APK Signature Verifier processes everything 100% in your browser using JavaScript and Web Crypto API. Your APK file is never uploaded to any server. This ensures complete privacy and security of your files. The tool works offline once the page is loaded.

About APK Signature Verifier

The APK Signature Verifier at xapktoapk.com is a free online tool that checks the digital signature of any Android APK file. It analyzes signing schemes, extracts certificate details, computes SHA fingerprints, and provides a comprehensive security score — all without uploading your file to any server.

What Can You Verify?

  • Signing Schemes: V1 (JAR), V2 (APK Sig), V3 (Key Rotation), V4 (Streaming)
  • Certificate Details: RSA/DSA/ECDSA certificates with size and type info
  • SHA Fingerprints: SHA-1 and SHA-256 hashes of the APK and certificates
  • META-INF Analysis: MANIFEST.MF entries, .SF files, and certificate files
  • Security Score: 0-100 score based on signing scheme coverage
  • Exportable Reports: Copy or download verification results as JSON

Use after downloading APKs from third-party sources, after signing APKs, or to compare certificate fingerprints with official sources. Part of the xapktoapk.com suite of 10 free Android tools.