SSL Checker
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Instantly analyze the SSL/TLS security of any website. Enter a domain and the tool connects directly to the server to fetch the live certificate - no cached results. You get the full picture: certificate validity dates with a color-coded expiry countdown, the issuing Certificate Authority, all Subject Alternative Names (SANs), the signature algorithm, and the key size. An overall security grade (A+ to F) summarizes the configuration based on certificate trust, TLS protocol support, HSTS enforcement, and HTTP redirect behavior. TLS 1.2 and TLS 1.3 support is probed independently and displayed alongside the active cipher suite and forward secrecy status. The certificate chain is visualized from the end-entity certificate through intermediates to the root CA. Security headers including HSTS (with max-age and preload), X-Frame-Options, Content-Security-Policy, and X-Content-Type-Options are checked separately. All certificate fingerprints (SHA-1 and SHA-256) are shown for manual verification. Any issues found are listed with plain-language explanations. Click Copy Report to export the full audit as formatted text.
How to Use
- 1Type or paste a domain name into the input field - you can include https:// or www. and the tool will strip them automatically (e.g. https://example.com → example.com)
- 2Click 'Check SSL' or press Enter - the tool connects to the domain's server and fetches the live certificate (takes 5–15 seconds)
- 3Read the grade badge (A+ to F) and the hero card for the issuer, trusted status, domain match, and expiry countdown
- 4Check 'Certificate Details' for the Common Name, issuing CA organization, signature algorithm, and key size
- 5Review 'Validity Period' - the color-coded 'Days Remaining' and the lifetime progress bar show how close the certificate is to expiry
- 6Inspect 'TLS Protocol Support' - TLS 1.3 and 1.2 should show Supported; TLS 1.1 and 1.0 should show Disabled
- 7Review 'Security Features' - confirm HTTP redirects to HTTPS, HSTS is enabled with a long max-age, and key security headers are present
- 8Expand 'Subject Alternative Names' to see every domain covered by the certificate - confirm your domain is listed
- 9Expand the 'Certificate Chain' to verify the full trust path from end-entity certificate to root CA
- 10Click 'Certificate Fingerprints' to reveal SHA-1 and SHA-256 fingerprints for manual verification or pinning
- 11Click 'Copy Report' to export the full SSL audit as formatted plain text - useful for sharing with your team or saving for records
Features
- Live certificate fetch - no cached data, always up-to-date
- Overall security grade A+ to F with score breakdown
- Certificate expiry countdown with color-coded urgency
- Certificate chain visualization (end-entity → intermediate → root CA)
- TLS 1.2 and TLS 1.3 protocol support detection
- Cipher suite and forward secrecy (ECDHE) detection
- HSTS, HSTS preload, and includeSubDomains checks
- HTTP → HTTPS redirect verification
- Content-Security-Policy and X-Frame-Options header checks
- Subject Alternative Names (SANs) - all covered domains listed
- SHA-1 and SHA-256 certificate fingerprints
- Signature algorithm and RSA/EC key size display
- One-click full audit report copy
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