In development. RVNT is pre-release — not yet security-audited. Source code, public builds, and the iOS / App Store release aren’t available yet. See the roadmap →

HMAC Generator

Keyed HMAC: SHA-256 / 384 / 512.

Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.

Compute an HMAC over a message with a secret key using SHA-256/384/512 — the standard way to authenticate a message — entirely in your browser via Web Crypto.

…

Frequently asked questions

What is an HMAC used for?

An HMAC proves a message hasn’t been tampered with and came from someone who holds the shared secret key — used to sign API requests, webhooks, and tokens.

Is my secret key uploaded?

No. The key and message stay in your browser; the HMAC is computed locally with the native Web Crypto implementation and nothing is sent anywhere.

Related tools

Password Generator Strong, random passwords — generated locally. Hash Generator SHA-1, SHA-256, SHA-384 & SHA-512. JWT Decoder Decode a JSON Web Token, locally.

Built by a privacy company

These tools never phone home — the same principle as RVNT itself: a post-quantum, end-to-end-encrypted, peer-to-peer messenger with no servers and no tracking.

Get RVNT All tools