What is HMAC used for?

HMAC (Hash-based Message Authentication Code) is used to verify both data integrity and the authentication of a message using a shared secret key (e.g., GitHub and Stripe webhooks).

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Private (Runs in Browser)

Free Utility

Cryptographic Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, CRC32, and HMAC signatures in real-time directly in your browser.

UPPERCASE HexEnable HMAC Secret Key

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30 characters (30 UTF-8 bytes)Computed 100% locally in your browser

Generated Cryptographic Hashes

Cryptographic Hash Reference & Security Guide

SHA-256 & SHA-512

Standard in TLS/SSL certificates, Bitcoin blockchain, Git commit signing, and password hashing (PBKDF2/Argon2). Highly collision-resistant.

MD5 & SHA-1

Cryptographically broken due to practical collision attacks. Suitable only for legacy checksums, cache busting, and non-security integrity checks.

CRC32 Checksum

32-bit cyclic redundancy check designed to detect accidental transmission noise in Ethernet frames, ZIP archives, and PNG chunks.

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Frequently Asked Questions

No. All hashes are computed 100% locally in your browser using the native Web Cryptography API and client-side algorithms.

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