HTTP Header Inspector — Free Online Tool
Paste HTTP request or response headers and get a categorized breakdown with descriptions. Recognizes Content-Type, Cache-Control, CORS headers, security headers (CSP, HSTS, X-Frame-Options), authentication headers, and more.
100% client-side. No uploads. Your data never leaves your browser.
How to use HTTP Header Inspector
- Paste HTTP headers (one per line, Name: Value format).
- Headers are parsed and grouped by category instantly.
- Read descriptions to understand what each header does.
- Use the CORS preset to quickly understand CORS configuration.
Frequently Asked Questions
How do I get HTTP headers to inspect?
In Chrome DevTools: Network tab → select a request → Headers section. Copy the raw headers and paste here.
What headers are recognized?
Content-Type, Cache-Control, Authorization, CORS headers, CSP, HSTS, Set-Cookie, User-Agent, and 20+ others with descriptions and categories.
Are custom headers supported?
Yes. Any header follows the Name: Value format. Unrecognized headers are shown with a generic description.
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