When should I use it?
Use HTTP Header Viewer when you need a private, upload-free browser tool for this task.
Online URL Utility
HTTP Header Viewer
Inspect status and response headers from your browser. CORS may limit visibility on some sites.
Best-effort network mode — Requests run from your browser. Many sites block CORS, so some results may show as Unverified/Blocked. No proxy server is used.
Tip: drag & drop a TXT/CSV onto this card, or use Import below.
Tool Options
Working…
Results
Results will appear here…
FreeConverter.app Guide
What does HTTP Header Viewer do?
Inspect response headers like cache-control, HSTS and CSP.
Who is it for?
Developers, marketers, students, and anyone who needs a free browser utility.
Example input
Paste text, markup, or choose a local file (processed only in this browser tab).
Example output
Instant on-device result you can copy or download — nothing leaves your device.
Browser processing100% in-browser
PrivacyLocal Processing
UploadNot required
DifficultyEasy
How It Works
Fast URL utilities that run in your browser.
1
Paste or import
Paste text/URLs or import a TXT/CSV file. Nothing is uploaded to our servers for processing logic.
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2
Process in browser
All parsing runs locally in your browser.
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3
Copy or download
Export results as TXT, CSV, or JSON instantly.
Network checks are best-effort due to browser CORS rules.
About HTTP Header Viewer
View HTTP response headers such as cache-control, content-type, HSTS, CSP and X-Frame-Options. Browser best-effort — some origins hide headers via CORS. Designed for SEO, marketing, and developer workflows with copy/export support and bulk-friendly input.
FAQs
Parsing and cleaning run in your browser. Network tools may request target websites directly from your device (CORS best-effort).
Yes. FreeConverter.app online URL tools are free to use.
No account or installation is required.
No. FreeConverter.app processes this tool locally in your browser. Your input is not uploaded to our servers.
No. HTTP Header Viewer on FreeConverter.app is free to use without creating an account.
Developers, marketers, students, and anyone who needs a free browser utility.