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HTTP Security Headers Checker — Free Online Tool

Audit HSTS, X-Frame, CSP, etc

Paste HTTP response headers → score security posture. HSTS, XFO, CSP, X-Content-Type, Referrer-Policy.

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Learn more

HTTP security headers checker

How to use this tool

  1. 1

    Paste HTTP response headers

  2. 2

    See security grade

Frequently Asked Questions

Must-have security headers?
HSTS, Content-Security-Policy, X-Frame-Options or CSP frame-ancestors, X-Content-Type-Options: nosniff, Referrer-Policy, Permissions-Policy.

Key Takeaways

  • HTTP Security Headers Checker is a free, browser-based seo & web tool — audit hsts, x-frame, csp, etc.
  • No signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use HTTP Security Headers Checker

  1. Open the tool: Launch HTTP Security Headers Checker on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

HTTP Security Headers Checker — Quick Facts

Price
Free — no limits, no watermarks, no paywalls
Privacy
100% browser-based — no data is sent to any server
Platform
Any modern browser on desktop, tablet, or mobile
Category
SEO & Web Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
FeatureDetails
ToolHTTP Security Headers Checker
CategorySEO & Web
Signup RequiredNo
File UploadNone — processed in browser
Mobile SupportFully responsive
CostFree forever

Why Use HTTP Security Headers Checker?

You should try HTTP Security Headers Checker for a quick, private way to audit hsts, x-frame, csp, etc. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.