hmac sha-256 generator

Online HMAC-SHA-256 generator

HMAC-SHA-256 appears in webhooks, API authentication and message validation. Here the page goes straight into the message + secret + signature flow.

Input text

HMAC secret

The secret is only used locally to calculate the HMAC signature.

Digest

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HMAC-SHA-256HMAC43 B256 bitskey-authenticated

Assinatura HMAC moderna e segura para integrações.

Text, files and secrets are processed locally. Nothing is sent to the server.

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Why use HMAC-SHA-256

HMAC combines the content with a secret key. This protects message authenticity, not only superficial integrity.
HMAC-SHA-256 is common in webhook signatures and APIs because it is simple to implement and widely supported.

HMAC-SHA-256 examples

Known vector

Input: mensagem: The quick brown fox jumps over the lazy dog segredo: key
Expected output: f7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8

Great for validating integration implementations.

Simple webhook

Input: mensagem: {"event":"ping"} segredo: demo-secret
Expected output: assine localmente com o preset da ferramenta

Useful to teach signature flows without exposing real secrets.

Full tool FAQ

Does the tool generate hashes locally?

Yes. Text, files and HMAC secrets are processed directly in the browser without any upload.

What is the difference between a hash, a checksum and HMAC?

Is MD5 still useful for anything?

When should I use SHA-256?

Are CRC32 and Adler-32 encryption?

What changes when I use HMAC?

Can I calculate a file hash without uploading the file?

Does comparison ignore uppercase, lowercase and spaces?

Can I use this generator for passwords?

Is it worth creating dedicated pages for MD5, SHA-256 and others?

Frequently asked questions

Is HMAC the same as a plain hash?

No. HMAC depends on a secret key and is used to authenticate the message.

Is the secret stored?

No. The secret is only used locally in the browser to calculate the signature.