TLS Checker
Check supported TLS versions, certificate identity, issuer, and expiration details.
Powered by Geekflare TLS Scan API
Why Use the TLS Checker Tool
Relying on outdated protocols like TLS 1.0 or 1.1 or certificate expiration will trigger severe security warnings in user browsers. You can use the Geekflare TLS Checker tool to validate a website server's TLS posture.
To maintain a strong security posture, you should disable outdated protocols SSLv2, SSLv3, TLS 1.0, and TLS 1.1 at the server level, as they are susceptible to known cryptographic attacks like POODLE and BEAST. Your server should be configured to support only TLS 1.2 and TLS 1.3.
TLS Protocol Guidance
| Protocol | Recommended State | Notes |
|---|---|---|
| TLS 1.3 | Enabled | Fastest modern TLS version with stronger defaults. |
| TLS 1.2 | Enabled | Widely supported modern baseline. |
| TLS 1.1 | Disabled | Deprecated and not recommended for public sites. |
| TLS 1.0 | Disabled | Deprecated and vulnerable to legacy attack classes. |
Certificate Checks
Review these fields after scan:
- Common Name: The primary identity listed on the certificate.
- SANs: Additional DNS names covered by the same certificate.
- Issuer: The certificate authority that issued the certificate.
- Expiry: The date after which clients may reject the HTTPS connection.
Renew certificates before they expire and keep legacy TLS disabled to reduce browser warnings, failed API clients, and avoidable security exposure.
Frequently Asked Questions
It checks which TLS protocol versions are supported by the target and returns certificate details such as the common name, Subject Alternative Names, issuer, and expiration date.
Modern sites should support TLS 1.2 and ideally TLS 1.3.
An expired TLS certificate can cause browsers and clients to reject the HTTPS connection. Renew certificates before expiry to avoid trust warnings and service interruptions.