SSL/TLS Test
Check a website's SSL certificate and security configuration.
Understanding SSL/TLS Security
SSL/TLS encrypts communication between your browser and websites. Without it, anyone on your network (Wi-Fi operator, ISP, attacker) can read your traffic in plain text.
Key things this test checks:
- Certificate validity — is the cert issued by a trusted CA, not expired, and matching the domain?
- Protocol versions — TLS 1.3 is best; TLS 1.2 is acceptable; anything older is insecure
- Key strength — RSA 2048+ or ECDSA 256+ bits
- DNSSEC — whether DNS responses are cryptographically verified
This test uses the SSL Labs API by Qualys, the industry standard for SSL analysis. Results may take a moment if the domain hasn't been tested recently.
FAQ
What does the SSL grade mean?
A+ is the best. A means good configuration. B means some issues. C or below means significant security weaknesses like outdated protocols or weak ciphers.
What is TLS?
TLS (Transport Layer Security) is the successor to SSL. It encrypts communication between your browser and websites. Modern sites should support TLS 1.2 and TLS 1.3.