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Mozilla Observatory

Scan a website for security headers and common web hardening practices.

headersaudit
Websiteobservatory.mozilla.org
CategorySecurity
PricingFree
Card requiredNo
← ← Back to directoryGo to Mozilla Observatory ↗ ↗

ABOUT

What is Mozilla Observatory?

Mozilla Observatory is a free web security scanner that analyzes websites for security headers, HTTPS configuration, TLS settings and other hardening best practices. It produces a numerical score and actionable recommendations for each category. The tool is maintained by Mozilla and can be used without an account, making it accessible for quick security audits.

BEFORE YOU SIGN UP

What you should know

✓
Free and requires no accountAny website can be scanned instantly without registration. The results are public by default, which is useful for transparency but may be a concern for sensitive domains.
✓
Clear scoring and recommendationsThe A+ through F grading system makes security posture easy to communicate to non-technical stakeholders, with specific action items for improvement.
△
Limited to HTTP security headersObservatory focuses on headers, TLS and HTTPS configuration. It does not cover application-level vulnerabilities like XSS, SQL injection or authentication issues.
✕
Infrequent updatesThe scanner has seen slower update cycles in recent years and some checks may not reflect the latest security best practices or emerging header standards.

COMMUNITY

From the forums

Security professionals on r/netsec and r/webdev recommend Mozilla Observatory as a quick and reliable first-pass security audit tool. The scoring system and clear recommendations are appreciated for educating non-security stakeholders about web vulnerabilities. Some users note that the scanner has not been updated as frequently as before and that some checks lag behind evolving security standards like new CSP directives.

— Community sentiment · Reddit

💬Discuss on Reddit ↗

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ABOUT US

Honest, independent, no fluff.

No paid placements. Just a clear look at what this does, what it costs, and what to know before you commit.

Read more→

FAQ

Questions, answered.

Is Mozilla Observatory completely free?＋

Yes, the scanner is completely free with no account required. There are no paid tiers or usage limits for on-demand scans.

What does Mozilla Observatory check?＋

It checks HTTP security headers (CSP, HSTS, X-Frame-Options, etc.), HTTPS configuration, TLS versions, certificate validity and content security policies.

Can I use the Mozilla Observatory API?＋

Yes, Mozilla Observatory provides a public API for automated scanning, which can be integrated into CI/CD pipelines for continuous security monitoring.