Generate HMAC signatures with SHA-256, SHA-384 or SHA-512 using WebCrypto.
Sign messages and verify webhook payloads. Enter a secret key, choose the algorithm and get the signature in hex or Base64.
It proves that a message came from someone who knows the shared secret and that it was not modified in transit.
No. This tool runs entirely in your browser using JavaScript and WebAssembly where needed. Your files and text never leave your device.
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