Free CSP Checker — Test Content Security Policy Online
Test Content-Security-Policy headers on any URL — detect unsafe-inline, wildcard sources, and XSS gaps. Free Quick Check, no signup required.
- Directive-level risk scoring
- Bypass pattern detection
- Stack-specific remediation
What This Tool Checks
- Directive-level risk scoring
- Bypass pattern detection
- Stack-specific remediation
Why It Matters
A weak Content-Security-Policy can leave room for script injection, unsafe third-party behavior, or policy bypasses that look harmless until a real exploit path appears.
Best For
Best for teams validating CSP after adding new scripts, updating tag managers, tightening browser protections, or preparing an application for stronger XSS defenses.
What To Do Next
Use the output to decide whether your next move is policy cleanup, staged report-only deployment, or stack-specific remediation on the pages that matter most.
Related Resources
Frequently Asked Questions
A CSP checker fetches the live Content-Security-Policy header from a URL and evaluates each directive for common weaknesses: unsafe-inline, wildcard sources, missing script-src, and incomplete default-src coverage that can leave XSS entry points open.