Content Security Policy (CSP) Checker
Analyze your website’s Content Security Policy and check for best practices, security gaps, and recommendations.
Paste your CSP header as returned by your server’s HTTP response.
Analysis Results
Parsed Directives
Recommendations
Security Score
🔍 What this tool does?
This tool analyzes Content Security Policy (CSP) headers to help developers understand and improve their web security posture. CSP is one of the most effective defenses against XSS attacks and content injection.
⭐ Key Features
- Real-time parsing of CSP headers
- Security warnings and best-practice suggestions
- Copyable CSP audit report
- Fully responsive and mobile-friendly UI
⚙️ How to use?
- Copy your website’s Content-Security-Policy header from browser dev tools or server config
- Paste it into the input field
- Click Analyze CSP
- Read the parsed results and review any recommendations or alerts
💡 Creative Use Cases:
- Web developers securing applications
- Security researchers validating CSP usage
- DevOps teams auditing web configurations
- Training students on web security headers
✨ Tool Description
CSP Checker is a free tool that lets you analyze and improve your Content Security Policy headers. It identifies potential security risks and offers tips for optimizing your CSP implementation.
❓ FAQs
What is a Content Security Policy (CSP)?
CSP is an HTTP header that helps prevent cross-site scripting (XSS), clickjacking, and other code injection attacks by specifying which sources of content are allowed to load on a web page.
Why should I use CSP?
CSP reduces the risk of malicious content execution by whitelisting trusted sources for scripts, styles, images, and other resources, making it harder for attackers to inject harmful content.
What do unsafe-inline or * mean in CSP?
Using *'unsafe-inline' or * allows execution of inline scripts or loading from any domain, which increases XSS risk. Avoid them unless absolutely necessary.
How can I test my CSP before deploying?
Use the Content-Security-Policy-Report-Only header to monitor violations without enforcing restrictions, then adjust your policy accordingly.
Should I use report-uri or report-to?
report-to is the modern replacement for report-uri, using the Reporting API. Support is growing, but check browser compatibility before migration.
Can CSP block all XSS attacks?
While CSP significantly reduces XSS risks, especially when strict policies are used, it’s not a silver bullet. Combine it with input validation, secure coding practices, and other security layers.