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HMAC Generator

100% Free

Sign messages with HMAC-SHA1, SHA-256, or SHA-512 — hex or Base64, client-side.

100% Secure
No Sign Up
Client-Side
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Encoding
Case

Client-side only — do not paste production secrets into untrusted sites.

Signature

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<iframe
  src="https://tools.town/embed/hmac-generator/"
  width="100%"
  height="600"
  style="border:none; border-radius:12px;"
  loading="lazy"
  title="HMAC Generator">
</iframe>

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How to Use

  1. 1 Pick HMAC-SHA1/256/512
  2. 2 Enter secret and message
  3. 3 Choose hex or Base64
  4. 4 Copy the signature

Features

  • Three SHA algorithms
  • Hex + Base64
  • Web Crypto API
  • Client-side

Why it Matters

Webhook and API signing needs a multi-algo HMAC playground beyond a single SHA-256 hash tool.

★★★★★

Generate HMAC signatures for webhook and API testing. Prefer the SHA-256 Generator when you only need a plain digest.

Frequently Asked Questions

Vs SHA-256 Generator?
SHA-256 Generator focuses on digests + HMAC-SHA256. This tool adds SHA-1 and SHA-512 HMAC plus Base64.
Safe for production secrets?
Prefer local tools for production keys. This runs client-side but treat any pasted secret as exposed.
Financial advice?
N/A — cryptographic utility only.
📖

Want to learn how this works?

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Hub for decoding JWTs, comparing tokens vs sessions, diceware passphrases, and htpasswd for staging — client-side Tools.Town security utilities.

16 Aug 2026

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Sign a Webhook Payload With HM
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Sign a Webhook Payload With HMAC

Produce an HMAC-SHA256 hex signature for a webhook body and shared secret before wiring verification.

16 Aug 2026

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