Free online HMAC hash generator supporting MD5, SHA1, SHA256, SHA384, and SHA512 algorithms with Hex and Base64 output.
TL;DR: Free online HMAC multi-algorithm generator supporting MD5, SHA-1, SHA-256, SHA-384, and SHA-512 with Hex and Base64 output formats. Computed locally in your browser, secret key never leaves your device.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
FAQ
Completely free, no registration required. Generate HMAC signatures directly in your browser — all computation runs locally with no usage limits.
Supports five common HMAC algorithms: MD5, SHA-1, SHA-256, SHA-384, and SHA-512. Built on Web Crypto API for fast and secure computation.
No. All HMAC computation runs locally in your browser. Neither the secret key nor the message is sent to any server, ensuring complete privacy and key security.
HMAC uses a secret key to hash a message — only someone with the same key can generate and verify the signature. It is commonly used for API signatures, webhook validation, and authentication scenarios. Regular hashing requires no key and is mainly used for data integrity checks.
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