SHA-1, SHA-256, SHA-384, SHA-512 for text or files. HMAC signing. Hash comparison. 100% client-side — nothing leaves your browser.
Drag & drop any file here, or click to browse
Paste two hashes to check if they match. Comparison is constant-time to prevent timing attacks.
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About Cryptographic Hashing
Which algorithm should I use in 2026?
SHA-256 is the standard for most use cases — digital signatures, certificate fingerprints, git commits, file integrity. SHA-512 offers higher security margins at a small speed cost. SHA-1 is deprecated — broken for collision resistance since 2017 (SHAttered attack). Do not use SHA-1 for any security-critical application. Never use MD5 for security.
Is this tool safe for sensitive data?
Yes. All hashing uses the browser's SubtleCrypto API. No data is sent to any server — this page works fully offline after the initial load. To verify: open DevTools → Network → hash some text → confirm zero outbound requests.
What is HMAC used for?
HMAC (Hash-based Message Authentication Code) signs a message with a shared secret key. Without the key, the signature cannot be reproduced. Common uses: Stripe webhook verification, JWT signing (HS256), API request signing, and password hashing (as part of PBKDF2). Unlike a plain hash, HMAC cannot be pre-computed without the key, preventing rainbow table attacks.
Can two different inputs produce the same hash?
Theoretically yes (that's a "collision") — but SHA-256 has 2²⁵⁶ possible outputs, making deliberate collisions computationally infeasible with current hardware. SHA-1, however, was demonstrated colliding in practice in 2017. For SHA-256 and above, collision resistance is not a practical concern.