ZeroData Tools
Tools
JSON Formatter Format and validate JSON instantly with no uploads, no server calls, and no stored data. JSON Validator Validate JSON instantly before deploys with local processing and zero server calls. YAML Validator Validate YAML files and catch indentation errors instantly with no uploads or backend processing. Base64 Encoder Encode or decode Base64 strings instantly with zero uploads. URL Encoder Encode and decode query parameters locally for APIs, redirects, and forms. HTML Formatter Pretty-print messy markup and inspect structure without exposing page code. CSS Minifier Shrink stylesheets for production with browser-only processing and instant output. JavaScript Beautifier Reformat dense JavaScript into readable code locally for debugging.
Advertisement
Live tool

HTTP Header Analyzer

Parse and analyze HTTP response headers for security issues. Check CSP, HSTS, and more — locally in your browser.

URL EncoderHash Generator (Bcrypt/SHA)Secret Scanner
HTTP Header Analyzer
Parse and grade HTTP security headers locally. No data sent to any server.
Ctrl+Enter AnalyzeSecurity grade
Paste HTTP HeadersRaw response headers
Analysis ReportSecurity grade
ReadyBrowser only
Paste HTTP response headers to analyze security configuration.
Advertisement

HTTP Header Analyzer

HTTP security headers are your web application's first line of defense against common attacks like XSS (Cross-Site Scripting), clickjacking, MIME-type confusion, and man-in-the-middle attacks. Yet many production websites are missing critical security headers, leaving them vulnerable to attacks that could be prevented with a single line of server configuration.

This analyzer parses raw HTTP response headers and checks for the presence and configuration of 10 critical security headers: Content-Security-Policy, Strict-Transport-Security (HSTS), X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy, Cross-Origin policies, and more.

Each header is weighted by importance, and the tool produces an overall security grade from A+ (excellent) to F (critical issues). Missing headers include specific recommendations for proper values. The entire analysis runs locally in your browser.

How to Use the HTTP Header Analyzer

  1. Copy the HTTP response headers from your browser's DevTools (Network tab).
  2. Paste the raw headers into the input editor.
  3. Click Analyze Headers to run the security check.
  4. Review the grade and fix any missing security headers on your server.

HTTP Header Analyzer Examples

Before 
HTTP/1.1 200 OK
Content-Type: text/html
Strict-Transport-Security: max-age=31536000
X-Content-Type-Options: nosniff
After 
Security Grade: C (40%)
✅ HSTS — Present
✅ X-Content-Type-Options — Present
❌ Content-Security-Policy — MISSING
❌ X-Frame-Options — MISSING

Frequently Asked Questions

  • What security headers should every website have?

    At minimum: Content-Security-Policy, Strict-Transport-Security, X-Content-Type-Options, X-Frame-Options, and Referrer-Policy. These address the most common web vulnerabilities.

  • How do I get my website's HTTP headers?

    Open your browser's DevTools (F12), go to the Network tab, reload the page, click on the main document request, and copy the response headers.

  • Is this tool accurate for production audits?

    This tool checks header presence and provides a weighted score. For production security audits, supplement this with tools like Mozilla Observatory or SecurityHeaders.com.

  • Are my headers uploaded to a server?

    No. All parsing and analysis happens locally in your browser using client-side JavaScript.

Related Tools

URL EncoderHash Generator (Bcrypt/SHA)Secret Scanner