Generate Hashes for API Request Signing

Understand HMAC signing by computing the hash of your API payload before sending signed requests.

Non é necesario iniciar sesión

Tip: SHA-256 and SHA-512 are cryptographically secure. SHA-1 is legacy and no longer recommended for security-sensitive use. All hashing runs locally in your browser — files and text are never sent anywhere.

API Signing tips

✍️

Many APIs (AWS, Stripe, Twilio) use HMAC-SHA256 to sign requests. The signature is a hash of the request body combined with your secret key.

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Use this tool to verify what your request payload's raw SHA-256 hash looks like before the HMAC layer is applied.

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If your signed request is being rejected, hash the raw payload here and compare it to what your signing implementation produces.

📋

Webhook providers like GitHub send an X-Hub-Signature-256 header. Compute the SHA-256 hash of the raw webhook body to verify it matches.

Como funciona

Entra

Enter your data into the tool above. Everything stays local to your browser.

Proceso

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Descargar

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

Por que usar o noso?

✓Completamente gratuíto, sen custos ocultos, nunca

✓Non se precisa ningunha conta, correo electrónico ou inicio de sesión

✓Os ficheiros nunca saen do teu dispositivo

✓Non hai límites de tamaño de ficheiro

✓Non hai marcas de auga en ningunha saída

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