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Verify your TLS certificate health instantly. Check validity, expiry, chain trust, cipher strength, and overall security grade to keep your site trusted by browsers.
Transport Layer Security (TLS), formerly known as SSL, is a cryptographic protocol that encrypts data between a browser and your server. It ensures confidentiality, integrity, and authenticity — the foundation of trusted web communication.
Browsers warn users on expired, self-signed, or misconfigured certificates. This damages trust, lowers conversions, and impacts SEO rankings.
Missing intermediate certificates, weak cipher suites, outdated TLS versions (1.0/1.1), expired certificates, and misconfigured HSTS headers are the top issues we detect.
Type your domain into the SSL checker tool above.
We connect to port 443 and negotiate the highest supported TLS version.
Inspect validity, expiry, chain trust, subject, and SAN coverage.
Review your security grade and fix weak ciphers or misconfigurations.
Checks if your certificate is trusted, unexpired, and correctly issued by a recognized CA. Flags self-signed or revoked certificates that break browser trust.
Scores your TLS setup from A+ to F based on certificate trust, protocol versions, cipher strength, HSTS, and key exchange parameters.
Detects which TLS versions your server supports. Flags outdated protocols like TLS 1.0/1.1 that expose your site to known vulnerabilities.
Lists all accepted cipher suites and highlights weak or deprecated ones. Recommends modern AEAD ciphers with perfect forward secrecy.
Verifies the complete certificate chain from leaf to root CA. Missing intermediate certificates are a common cause of mobile browser warnings.
Displays days until certificate expiry. Proactive alerts prevent embarrassing downtime when certificates unexpectedly expire.
Automate certificate expiry alerts, track TLS grade trends over time, and get notified the moment a misconfiguration is introduced.