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XSS Protection Checker

Check pasted response headers for XSS-relevant protections — Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, and X-XSS-Protection presence, locally in your browser.

100% Local Browser Native

How to Use the XSS Protection Checker

1. Paste response headers

Raw response headers, one per line — e.g. content-security-policy: default-src 'self'.

2. Read presence checks

Each of the five protections shows present or missing with its role.

3. Add missing headers

Set them server-side (CSP with strict script-src first), then recheck.

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Frequently Asked Questions

What does it check?

Header presence only: CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, and X-XSS-Protection (deprecated but harmless). No payloads are sent.

Does passing mean I'm safe?

No — presence checks catch missing headers, not logic flaws or stored XSS. CSP with strict script-src plus context-aware output encoding is the real fix; this is a checklist.

Which input can I check?

Any response headers you paste — typically your own app's. Nothing is fetched or probed over the network.

Is my work uploaded anywhere when using XSS Protection Checker?

No — header checking runs locally in your browser, free with no signup.

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Last updated October 2026