TLS Certificate Checker

Check TLS/SSL certificates and protocol support for any domain with this free online tool.

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About This Tool

This TLS Checker Online tool allows you to verify the SSL/TLS certificate details and security configuration of any domain. Enter a domain name, select a port (default 443 for HTTPS), and choose which TLS protocols to check. The tool will connect to the server, retrieve the certificate, and display information such as issuer, expiration date, subject, and supported protocols. It also provides a security grade based on best practices, helping you ensure your website's TLS configuration is secure and up-to-date. No installation or API keys required—fully functional with real-time checks.

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How to Use

Enter a domain name (e.g., example.com) in the input field.
Select a port (default is 443 for HTTPS).
Choose which TLS protocol versions to check (TLS
0 to
.
Click the 'Check TLS' button to run the analysis.
View the results, including certificate details, protocol support, and security grade.
Use the 'Clear' button to reset the form and run a new check.

Frequently Asked Questions

Find Quick Answers

What does this TLS checker tool do?

It connects to a domain's server over the specified port, retrieves the SSL/TLS certificate, and checks which TLS protocols are supported. It displays detailed certificate information and a security assessment.

Do I need to provide an API key or install software?

No, this tool is fully self-contained. The backend uses PHP's built-in OpenSSL and socket functions, so no external APIs or installations are required on the user side.

Which TLS versions does the tool check?

It can check TLS 1.0, 1.1, 1.2, and 1.3. You can select which versions to test in the form before running the check.

What ports can I check besides 443?

You can enter any port number, but common ports for TLS are 443 (HTTPS), 465 (SMTPS), 993 (IMAPS), and 995 (POP3S). The tool defaults to 443.

How is the security grade calculated?

The grade is based on best practices: supporting only TLS 1.2 or higher, having a valid and non-expired certificate, and using strong encryption. Lower grades indicate outdated protocols or certificate issues.

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