HMAC Generator

Compute HMAC-SHA-1, SHA-256, SHA-384, or SHA-512 with any secret. Free, private, runs in your browser.

Message

Secret

Algorithm

Hex

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Base64

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HMAC = Hash-based Message Authentication Code. It proves both the contents and the source of a message — anyone holding the secret can verify, but cannot forge without it. Common uses: API request signing (AWS SigV4, webhooks), session tokens, and TOTP.