Webhook Signature Verifier — HMAC Validation Tool
Compute and verify HMAC webhook signatures in your browser. Supports HMAC-SHA256, SHA-512, and SHA-1 with hex or base64 encoding. Compatible with Stripe, GitHub, Twilio, and any HMAC-signed webhook.
How to Use Webhook Signature Verifier — HMAC Validation Tool
How to Use the Webhook Signature Verifier:
Choose a Mode: Select "Compute Signature" to generate an HMAC for a payload, or "Verify Signature" to check an incoming webhook against a known signature.
Select Algorithm: Choose HMAC-SHA256 (recommended, used by Stripe and GitHub), HMAC-SHA512, or HMAC-SHA1 (legacy, some older systems). For most webhooks, HMAC-SHA256 is correct.
Choose Encoding: Select Hex (most common) or Base64 depending on what your provider uses.
Enter Your Secret: Paste the webhook secret from your provider's dashboard (e.g., Stripe's "Signing Secret", GitHub's "Secret").
Paste the Raw Payload: Paste the raw webhook body exactly as received — do not parse or reformat it. JSON whitespace affects the signature.
Verify Mode: Paste the signature from the webhook header (e.g., the value of X-Hub-Signature-256 or the v1= part of Stripe-Signature). The "sha256=" prefix is stripped automatically.
Click Compute/Verify: The result shows the computed signature and whether it matches the expected value.
Provider quick reference:
- Stripe: HMAC-SHA256, hex. Header: Stripe-Signature (t=timestamp,v1=signature). Sign: timestamp.rawBody
- GitHub: HMAC-SHA256, hex. Header: X-Hub-Signature-256 (sha256=signature). Sign: rawBody
- Twilio: HMAC-SHA1, base64. Sign: URL + sorted POST params
- AWS SNS: HMAC-SHA256 via RSA signature (different mechanism)
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