Common usage patterns
Typical ways visitors use this tool.
- Check whether a site is returning expected security headers after a deployment or CDN change.
- Review missing or weak header coverage before hardening a web application.
- Use the result as a quick web-security baseline check before moving to deeper testing.
Tool overview
A quick summary of what this tool does on the page.
Check security headers online with this free Security Header Checker. Enter a URL, run the tool, and review CSP, HSTS, X-Frame-Options, and related header coverage instantly.
Questions answered on-page
Quick answers to common questions about using this page.
What does Security Header Checker do?
Security Header Checker fetches a target URL and evaluates the presence of common security headers such as CSP, HSTS, and related protections.
When should I use Security Header Checker?
Use it after infrastructure changes, during web-app hardening, or when you want to confirm that the live site is returning the headers you expect.
Can Security Header Checker help find missing protections?
Yes. It is useful for quickly spotting which common security headers are present, missing, or worth reviewing in more detail.
Related tools
Open the next tool in the workflow or compare similar options.
Guides and comparisons
Read supporting pages that explain the workflow, common decisions, and related usage patterns.