CSP Policy Validator
Validate Content Security Policy headers against W3C spec and common pitfalls. Code never leaves your device — formatting and validation run locally in your browser.
How to Use the CSP Policy Validator
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Frequently Asked Questions
Which directives?
default-src, script-src, style-src, frame-ancestors, and the full set.
unsafe-inline?
Flagged wherever it appears — nonces and hashes suggested instead.
Report-only mode?
Evaluated as enforceable policy with violation paths explained.
Is my input uploaded anywhere when using CSP Policy Validator?
No — validation runs locally in your browser, free with no signup.
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Last updated October 2026