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HTTP Security Header Auditor - local response header checklist

Audit raw response headers for HSTS, CSP, cookie flags, MIME sniffing, clickjacking, referrer, and permissions policy gaps.

  • Runs locally
  • Category Developer & DevOps
  • Best for Formatting, validating, shrinking, or inspecting code-adjacent text.
Runs locally in your browser. Files are not uploaded. Text limit: 8 MB.
Output format
Headers
8
High
0
Medium
0
Issues
1

What this tool does

HTTP Security Header Auditor reviews pasted response headers or curl -I output and turns them into a browser security checklist. It checks Strict-Transport-Security, Content-Security-Policy, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, X-Frame-Options or frame-ancestors, Server and X-Powered-By disclosure, and Set-Cookie flags such as Secure, HttpOnly, and SameSite. The tool is built for release reviews, client handoff, bug bounty triage, reverse proxy changes, CDN migrations, and quick production sanity checks. It does not scan a live site or send requests. You bring the headers, it produces a Markdown, JSON, or CSV report that can be shared with security, platform, and frontend teams.

Tool details

Input
Files + Text + Numbers
The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
Output
Live result + Copy + Download
The result area focuses on usable output, with copy, download, or preview actions when supported.
Privacy
Browser-side processing
The main tool logic does not call an external API, so inputs normally stay in the current tab.
Save / share
Shareable URL state
Key settings are encoded in the URL so another person can reopen the same setup.
Performance budget
Initial JS <= 118 KB
No WASM budget is declared, keeping the tool quick to open on mobile.
Best fit
Developer & DevOps · Developer
Category and role tags drive related tools, internal links, and quick fit checks.

How to use

  1. 1. Input

    Paste or drop your content into the tool panel.

  2. 2. Process

    Click the button. All processing is local in your browser.

  3. 3. Copy / Download

    Copy the result or download to disk in one click.

How HTTP Security Header Auditor fits into your work

Use it in the small gaps between coding, reviewing, debugging, and shipping.

Developer jobs

  • Formatting, validating, shrinking, or inspecting code-adjacent text.
  • Preparing snippets for documentation, tickets, commits, or handoff.
  • Checking a small payload quickly without switching tools.

Developer checks

  • Run irreversible transforms like minify or obfuscate on a copy.
  • Keep secrets out of pasted snippets unless the tool explicitly stays local.
  • Use your normal tests or linter before shipping transformed code.

Good next steps

These links move the current task into a more complete workflow.

  1. 1 CSP Policy Auditor Inspect Content-Security-Policy directives for unsafe sources, missing fallbacks, framing gaps, object-src, base-uri, and reporting coverage. Open
  2. 2 Robots.txt Auditor Check robots.txt for user-agent groups, allow and disallow rules, sitemap declarations, crawl-delay, and unsupported directives. Open
  3. 3 HAR Performance Analyzer Upload a Chrome DevTools HAR file and get a local performance, cache, host, asset, status, and security-header report. Open

Real-world use cases

  • Review a release before production

    Paste staging or production headers and catch missing browser hardening before launch.

  • Triage security reports

    Convert a screenshot or curl output into a structured issue list for platform owners.

Common pitfalls

  • Setting cookies without SameSite and Secure after moving behind HTTPS.

  • Adding CSP once and never checking whether unsafe-inline or unsafe-eval slipped back in.

Privacy

Headers can expose infrastructure and cookie names. The auditor parses pasted text locally.

FAQ

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Made by Toolora · 100% client-side · Updated 2026-05-29