TLS Version Checker
Test any domain's TLS configuration in seconds. Check protocol version, TLS 1.3 support, legacy protocol detection, and cipher strength.
What is TLS?
TLS (Transport Layer Security) is the protocol that encrypts data between browsers and servers. It's the successor to SSL. TLS 1.3, released in 2018, is the latest version and offers faster handshakes, stronger encryption, and removes legacy algorithms. TLS 1.2 remains acceptable, but TLS 1.0, TLS 1.1, and SSL 3.0 are deprecated and vulnerable.
Why check your TLS version?
Running outdated TLS versions exposes your site to known attacks like POODLE (SSL 3.0), BEAST (TLS 1.0), and Lucky Thirteen (TLS 1.1). PCI DSS compliance requires TLS 1.2 or higher. Modern browsers are dropping support for TLS 1.0/1.1 entirely. Upgrading to TLS 1.3 also improves page load times with its zero-round-trip handshake.
How to upgrade to TLS 1.3
Most modern web servers support TLS 1.3: Nginx 1.13+, Apache 2.4.37+, and recent versions of Caddy, Traefik, and HAProxy. Update your server software, set the minimum protocol to TLS 1.2 (ssl_protocols TLSv1.2 TLSv1.3 in Nginx), and disable weak cipher suites. Test with this tool after changes.
FAQ
Frequently asked questions
Is this TLS checker free?+
Yes, completely free. No signup or credit card required. Test any public domain's TLS configuration instantly.
What does the TLS grade mean?+
The grade reflects your TLS configuration strength. A+ means TLS 1.3 with strong ciphers and no legacy fallback. Lower grades indicate outdated protocols, weak ciphers, or configuration issues that could put your visitors at risk.
How is this different from an SSL checker?+
Our SSL checker focuses on certificate validity, expiry, and issuer. This TLS checker focuses on the protocol negotiation: which TLS version is used, whether modern ciphers are selected, and if legacy protocols are still enabled. Both are part of CQwerty Shield's full security scan.
TLS Version Checker is just the start.
CQwerty Shield checks SSL, DMARC, SPF, DNS, HTTP headers, WHOIS, breach intel, and more — with CVE/KEV cross-references on every finding.
Free full scan — no signup →