ToolsXpo
ToolsXpo

HMAC SHA-256 Generator

Generate secure Hash-based Message Authentication Codes (HMAC) using SHA-256 and a secret key.

Configuration

This tool has an API.Automate it from your code — 1 credit/call.Open in Playground

New here? Create a free account and call this tool from your code in minutes.

0 chars0 lines
1
0 chars0 lines
1
How to use HMAC GeneratorEvery option explained, a worked example, and what to check when the output looks wrong.Read the guide

Examples & Use Cases

Payload Input

{"event": "checkout.session.completed"}

HMAC Signature (Hex)

e6fa4fcd85521404c03478d10b7a8a1835334cbf70a04da288ab89a9b1c7a826

HMAC SHA-256 Signature Generator

When building secure APIs, webhooks, or payment integrations (like Stripe or GitHub webhooks), you need a way to prove that the payload was not tampered with in transit. Our HMAC Generator uses the industry-standard Hash-based Message Authentication Code algorithm with SHA-256 to create cryptographic signatures securely.

How does HMAC work?

Unlike a standard SHA-256 hash which anyone can compute, an HMAC combines the payload message with a Secret Key known only to the sender and receiver. If a malicious actor intercepts the payload and alters it, the receiving server will compute a different HMAC and reject the request.

Privacy

Your Secret Key is the literal key to your application's security. Entering it into a standard online tool is a massive risk. Our application solves this by performing the HMAC encryption entirely locally within your browser using JavaScript cryptography. The secret key never leaves your machine.

How to use HMAC SHA-256 Generator

  1. Paste or type your input into the editor on the left.
  2. Leave the defaults, or tweak them if the tool exposes options.
  3. The result appears on the right as you type.
  4. Copy the output or download it.

This tool runs in your browser. Your input is not uploaded or stored.

Use it from the API

Everything this page does is also available as a REST endpoint, so you can call HMAC SHA-256 Generator from your own code, a script or a CI pipeline.

Bash
curl "https://api.toolsxpo.com/v1/hmac-generator" \
  -H "Authorization: Bearer txp_live_YOUR_KEY"

The endpoint returns a JSON envelope ({ ok, data, meta }) and costs 1 credit per successful call. Try it in the playground or browse the full API reference.

Related tools