Your security headers, graded by Mozilla
HTTP security headers protect your visitors from session theft, content injection and fraudulent framing of your pages. This tool applies Mozilla official, public and documented methodology.
Free, no account, no daily limitFree tool, no signup and no daily limit, published by LANXAS, a French artificial intelligence company. Servers are located in France and no analysis data is retained.
The headers that weigh most
| Header | What it prevents |
|---|---|
| Content-Security-Policy | Execution of third-party injected scripts on your pages. |
| Strict-Transport-Security | Downgrade of a secure connection to plain HTTP. |
| X-Content-Type-Options | A file being interpreted as a type other than declared. |
| X-Frame-Options | Your site being framed invisibly to trap your users. |
| Referrer-Policy | Leaking your internal URLs to the third-party sites you link. |
The link with SEO
Security is not a direct ranking factor, HTTPS aside. But it acts indirectly and strongly: a compromised site gets demoted or removed from the index, a browser warning drives visitors away, and content injection can turn your pages into spam pages without your knowledge.
A well-tuned content security policy also protects your structured data and tags from being altered by a third-party script, preserving how engines read your site.
Frequently asked questions
Who produces this grade?
Why does my score change between tests?
Does a low score hurt my Google ranking?
Does the tool test my certificate too?
Every tool in a single application
These tools are part of LANXAS SEO GEO, a complete application bringing together technical audit, keyword research, AI visibility, prospecting and PDF reports. Access is free.
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