SHA256 Hash Generator
Generate SHA256 hashes from text instantly in your browser.
Open SHA256 Hash Generator
HMAC Generator
Generate HMAC signatures with Web Crypto and crypto-es using a secret key and payload.
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Frequently asked questions
Common questions about this tool.
HMAC (Hash-based Message Authentication Code) is a signature created from a secret key and payload using a hash algorithm like SHA-256.
A plain hash only fingerprints input data, while HMAC combines input with a secret key so only parties with that key can reproduce and verify the signature.
The tool prefers Web Crypto when the selected algorithm is supported there, and automatically falls back to crypto-es for algorithms outside Web Crypto support.
This tool supports HMAC-SHA1, HMAC-SHA256, HMAC-SHA384, and HMAC-SHA512, all generated in-browser from your provided secret and payload.
No. Signature generation runs locally in your browser. Keep production secrets private and avoid sharing real keys in screenshots or logs.