HMAC

HMAC-SHA1/256/384/512 in hexadecimal。 Runs locally—nothing uploaded.

Hash algorithm

Secret key

Message

Output

—

Encode and decode Base64, URLs, Unicode, hashes, QR codes, and common developer data formats.

How to use & FAQ

HMAC: HMAC-SHA1/256/384/512 in hexadecimal. Keys and plaintext stay local.

For dev/test; use audited server crypto in production.

Signup required for HMAC?▾

No. Free with no account.

Secrets uploaded?▾

No.

Production passwords?▾

Use server-side libraries.

Output format?▾

Often hex or Base64—see page.

Mobile browsers?▾

Yes; heavy tasks better on desktop Wi-Fi.

Copy or download?▾

Yes—copy text or download files as supported.