Evidence Verifier

Calculate cryptographic hashes (SHA-256, SHA-512) for files entirely in your browser. Zero data transmission. Export results as PDF.

100% Local Processing

No data uploaded. All file processing happens locally in your browser using the Web Crypto API. Your files never leave your device.

File Upload

How to Use

  1. 1Select a file: Drag and drop or click to select a file (max 10MB, JSON or TXT files supported)
  2. 2View hashes: SHA-256 and SHA-512 hashes are calculated instantly
  3. 3Copy or export: Click hash values to copy, or export results as PDF
Technical Details
Hash Algorithm
SHA-256 and SHA-512 via Web Crypto API (SubtleCrypto.digest)
File Type Detection
Magic number detection (UTF-8 BOM stripping, JSON/TXT identification)
Browser Compatibility
Chrome 37+, Firefox 34+, Safari 11+, Edge 79+
Security
CSP-compliant, zero network requests, nonce-based script loading
Evidence Verification Tool | Interactive Playgrounds | DezoDev