How to use Security Headers Checker
- Paste the text you need to check into the input box.
- Tune the Paste raw HTTP response headers control before you check.
- Watch the output update instantly while you adjust the text.
- When it looks right, Copy to save it.
About this tool
Security Headers Checker is a static, client-side tool with no backend. Security Headers Checker is a free HTTP & Header Tools utility that runs in your browser, doing its work on the input you provide without a backend.
Because it runs on your device, it is fast and private and works offline once loaded. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What is Security Headers Checker for?
Security Headers Checker runs entirely on your device: add your input using the Paste raw HTTP response headers control, and it checks it locally in real time.
Do I need an account for Security Headers Checker?
No — Security Headers Checker needs no account, sign-up or installation.
Is my input private in Security Headers Checker?
Yes — your input never leaves your device; Security Headers Checker does all the work in your browser.
Does Security Headers Checker work offline?
Once the page has loaded, Security Headers Checker keeps working with no network connection.