Http Security Headers Checker
Use Http Security Headers Checker on AboveTool to parse URLs, headers, DNS/WHOIS text, IPs, and certificates in your browser — free, private, no signup.
Http Security Headers Checker
audits a pasted response header block for common security headers
Runs in your browser. Live DNS/WHOIS registries are not queried unless a mode explicitly uses a public lookup API.
About Http Security Headers Checker
Http Security Headers Checker audits a pasted response header block for common security headers. It works by checks HSTS, CSP, XFO, XCTO, Referrer-Policy, Permissions-Policy, and more. Missing headers are warnings — severity depends on your threat model. Http Security Headers Checker runs free in your browser at abovetool.com — no signup, instant results.
How to use
- Enter the inputs for this network utility (two IPs, a single address, headers, PEM, and so on).
- Click Compare IPs, Lookup, Convert, or Run depending on the tool.
- Review the on-page result (including bit diffs or maps where shown), then copy or download.
Features
- Mode-specific forms for headers, URLs, IPs, DNS, and certificates
- Client-side parsers and builders — no upload required
- Copy or download results instantly
- Unique tool copy with practical tips for each utility
Frequently asked questions
What is Http Security Headers Checker for?
Http Security Headers Checker is audits a pasted response header block for common security headers.
How does Http Security Headers Checker calculate the result?
It calculates checks HSTS, CSP, XFO, XCTO, Referrer-Policy, Permissions-Policy, and more.
Any tips for using this calculator?
Missing headers are warnings — severity depends on your threat model.
Is Http Security Headers Checker free on AboveTool?
Yes. Http Security Headers Checker is free to use on abovetool.com with no account required, and results are calculated instantly in your browser.