Stripe Webhook Signature Verifier
Step 1 — Configure Stripe Webhook Endpoint (required once)
- Stripe webhook endpoint (receive-only):
https://stripe-webhook-verifier.downup2u.workers.dev/webhook/stripe - This endpoint receives Stripe webhooks only.
- A
verification_idis generated ONLY after Stripe successfully delivers a webhook. - Verification IDs expire in ~5 minutes.
Important
- No input is required on this page for Step 1.
- This page does NOT trigger any webhook requests.
Enter delivery verification details to get an immediate verdict.
Used once for this verification. Not stored.Technical verifier that returns a one-time cryptographic verdict for a Stripe webhook delivery using verification_id and signing secret; no event replay. This is a standalone online tool. No account required. It is an online stripe webhook signature verifier for one-delivery decisions.
This page matches search intent such as:
- "verify stripe webhook signature online"
- "stripe webhook signature invalid"
- "stripe webhook signature checker"
Verify Stripe Webhook Signature Online
This is an online Stripe webhook signature checker that returns valid or invalid (with reason) for one delivery using a verification ID and webhook signing secret.
Related failure pages: - webhook-signature-invalid - webhook-secret-mismatch - webhook-timestamp-invalid
Stripe Webhook Signature Checker
Use this stripe webhook signature checker to verify stripe webhook signature online for a single delivery reference.
Verify Stripe Webhook Signature (Online Tool)
Inputverification_id- webhook signing secret (
whsec_...)
validinvalid(with reason)
How to get a verification ID (required once)
Follow Step 1 above, then send a test event from the Stripe Dashboard.
Verification IDs expire shortly after delivery. Please proceed to Step 2 immediately after sending a test event.
Use the verification ID generated from the most recent webhook delivery to this endpoint.
Old or reused verification IDs will fail with verification_id not found.
This tool only returns a cryptographic signature verdict for a specific delivery referenced by a verification ID.
It does not replay webhook events, process event data, or validate Stripe API object schemas or business meaning.
An online stripe webhook signature verifier determines whether a specific webhook delivery was cryptographically signed by Stripe.
If Stripe webhook signature verification failed, use this page to verify Stripe webhook signature and receive a definitive Stripe signature verdict for a specific delivery.
This is a one-time verification decision bound to a single verification_id.
When to use this tool
Use this tool if Stripe webhook signature verification fails and you need a definitive verdict.
When NOT to use this tool
## When NOT to use this tool Do NOT use this tool if you are debugging application code, validating business logic, or replaying webhooks.Common failure reasons
- Verification ID expired
- Verification ID does not belong to this endpoint
- Webhook was never successfully delivered
Why this tool exists
## Why this tool exists Stripe webhook signature verification is a high-frequency failure point in real systems. Most failures are not caused by Stripe sending an invalid request, but by **intermediate handling that changes the original request bytes**. Common causes (facts only): - **Raw body not preserved**: payload is reconstructed from a parsed object, re-stringified, trimmed, normalized, or has newline differences. - **JSON parsing happens before verification**: middleware consumes/decodes the body; the bytes used for verification are not identical. - **Wrong webhook secret**: secret from another endpoint, wrong environment (test vs live), or an outdated/rotated value. - **Wrong attempt/context**: mixing data across deliveries/environments/endpoints results in a failed verification.Compatible with Stripe Webhook Signing
Compatibility notes: checks the Stripe-Signature header format, uses timestamp tolerance semantics, and matches Stripe’s official signing algorithm for webhook signatures.
What is being verified (and what is not)
Verified: Given a verification_id (generated when Stripe delivers a webhook to this tool) and your webhook signing secret (whsec_...), the tool decides whether Stripe produced a valid signature for that specific delivery.
Not verified:
- Business correctness
- Whether the event “should” occur
- Whether application code is implemented correctly
This is a one-time decision about signature validity only. It does not replay or process the event.
Webhook Secret: origin and confidentiality boundary
The webhook secret is generated in the Stripe Dashboard when a webhook endpoint is created. Each endpoint has its own fixed secret (until rotated). This tool assumes that secret is already available.
The secret is sensitive and is not intended to be exposed to third-party services. You provide it voluntarily for a single verification request, and it is used only to compute a verdict for the referenced delivery.
Why verification can fail even when the event is 100% from Stripe
Legitimate source does not imply verifiable signature. Signature verification operates on bytes, not on “equivalent JSON.” Any middle layer that changes the payload byte stream (re-encoding, newline normalization, trimming, or re-serialization) can keep the meaning but break verification.
Input: Verification ID, webhook signing secret
Output: Valid / Invalid Stripe webhook signature
Stripe Webhook Signature Verification FAQ
How do I verify a Stripe webhook signature?
Verify Stripe webhook signature by submitting the webhook delivery reference (verification_id) and the corresponding webhook signing secret (whsec_...) to obtain a definitive Stripe signature verdict for that specific delivery.
Can I use this tool without reading other pages?
Yes. This is a standalone online stripe webhook signature verifier page: you can verify stripe webhook signature online here and only use the related pages if you want context for common failure modes.
Why does signature verification fail even with the correct secret?
Most failures are caused by mixing contexts (wrong endpoint, wrong environment, or using a verification ID from a different delivery) or using the wrong signing secret. Verification is specific to one delivery and one secret.
What is a verification ID?
A verification ID identifies a specific webhook delivery that Stripe sent to this tool. Use it to request a signature verdict for that single delivery.
What does verification_id not found mean?
This indicates an expired or unknown webhook delivery reference (for example: the verification ID expired, belongs to a different endpoint/environment, or the webhook was never successfully delivered). It is not a system error.
Is the signing secret stored or cached?
No. It is used for one verification request and is not stored or cached by this page.
Does a valid signature mean the event data is safe to trust?
A valid signature confirms that the provided inputs (verification ID + secret) correspond to a valid Stripe signature for that delivery. It does not certify business correctness, expectedness of the event, or downstream handling.