What does the SiteGuardian security scanner check?

The scanner checks SSL/TLS certificates, 6 security headers (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy), DNSSEC, email authentication (SPF, DKIM, DMARC), SMTP encryption, MTA-STS, DANE/TLSA, CAA records, and DNS exposure. Results are scored 0-100 with an A-F grade.

Is the security scanner free?

Yes, completely free. No account, no signup, no credit card needed. Enter any domain and get instant results.

How is the security score calculated?

The score is out of 100 points: Security Headers (25 pts), SSL/TLS (20 pts), Email Authentication (15 pts), DNS Security (15 pts), HTTPS Enforcement (10 pts), security.txt (5 pts), MTA-STS + TLS-RPT (5 pts), and Server Hardening (5 pts). Grade A = 90-100, B = 75-89, C = 60-74, D = 40-59, F = 0-39.

Which compliance frameworks does the scan map to?

Scan findings are mapped to GDPR, NIS2, CRA (Cyber Resilience Act), ISO 27001, SOC 2, PCI DSS, and other EU regulatory frameworks. Each finding shows which regulations it affects.

Where is the scan data processed?

All scans run from EU-hosted infrastructure in Germany. No data is transferred outside the EU. Scan results are cached temporarily and not stored permanently unless you create an account.

Free — no account needed

Free Website Security Check

Enter a domain. Get your security grade, score, and a detailed breakdown — in seconds.

We check SSL certificates, security headers, DNSSEC, email authentication, SMTP encryption, and more.

What we check

Your website is scanned across these security dimensions. Each is scored independently.

Security Headers

25 pts

HSTS, CSP, X-Frame-Options, X-Content-Type, Referrer-Policy, Permissions-Policy

SSL/TLS Certificate

20 pts

Key strength, signature algorithm, chain depth, TLS version, HTTPS redirect

Email Authentication

15 pts

SPF, DKIM key strength, DMARC policy enforcement, MTA-STS, TLS-RPT, SMTP encryption

DNS Security

15 pts

DNSSEC validation, CAA records, DANE/TLSA, DoH consistency

security.txt

5 pts

Vulnerability disclosure contact per RFC 9116

Server Privacy

5 pts

No version disclosure, no X-Powered-By, restricted CORS headers

Enter a domain

Type any URL — we handle the rest. No login, no signup, no credit card.

We scan everything

SSL, headers, DNS, email auth, SMTP encryption — checked in seconds from our EU servers.

See your grade

A-to-F grade, 0-100 score, and detailed recommendations for every finding.

One scan shows the problem. Continuous monitoring prevents it.

Start free. One monitor, SSL & domain alerts, Telegram bot — no credit card needed.

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See how your industry compares in the EU Security Benchmark →