# HMAC Signature Generator

Create a keyed SHA256 or SHA512 HMAC from an exact message.

[Open this tool](https://whatson.pk/developer-hmac-calculator/)

Category: Developer & Data

An HMAC comparison requires the same message bytes, key and algorithm on both sides.

Use example keys while testing and review the chosen output representation.

## Inputs and controls

* Message
* Demo secret key. The key is sent to this WordPress server for PHP processing. Use a demo key, not a live credential.
* Algorithm: HMAC SHA256; HMAC SHA512
* Digest representation: Hexadecimal; Base64

## How to use

* Paste or enter message.

* Choose algorithm and digest representation. Enter demo secret key.

* Select Process input. Read the returned values alongside the assumptions below before copying, exporting or acting on the result.


## Why use this tool

Key redaction keeps the secret out of the displayed result and export.


## Before relying on the result

The response and exports redact the key. The plugin does not save inputs; hosting request logging is outside its control.


## Tool limitations

The response and exports redact the key. The plugin does not save inputs; hosting request logging is outside its control.

## Questions

### Is the key processed only in my browser?

No. Calculation runs on the WordPress server. Hosting request logging is outside the tool's control.

### What should I check before using HMAC Signature Generator?

Check Message, Demo secret key, Algorithm and Digest representation. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T16:58:29+00:00

This profile describes the tool. It does not execute it or supply a professional certification.