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Webhook Signature Generator
Generate an HMAC signature for a webhook payload (GitHub/Stripe-style verification).
Free · No sign-up · Updated August 2026
Signature header value
Generates an HMAC signature for a webhook payload — the same scheme GitHub (X-Hub-Signature-256), Stripe and others use to verify requests. Everything is computed in your browser.
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
What is a webhook signature?＋
An HMAC of the request body computed with a shared secret. Providers like GitHub and Stripe send it in a header so you can verify the request is genuine.
Which schemes does it support?＋
HMAC-SHA256, SHA-1 and SHA-512, in hex or Base64, with an optional 'sha256=' style prefix. Computed in your browser.