About
Test TLS is a free online scanner for TLS configuration of servers. It checks a domain name or IP address on a specified TCP port and reports TLS configuration settings, security vulnerabilities, and the server's X.509 certificate.
The service supports autodetection by TCP port and several STARTTLS modes, including FTP, Telnet, SMTP, POP3, NNTP, IMAP, LDAP, MySQL, XMPP, and PostgreSQL. It is aimed at developers and operators who need a browser-based TLS check without installing local tooling.
- TLS configuration scanning for servers
- X.509 certificate download
- TCP port selection and autodetect
- STARTTLS support for common protocols
- Security vulnerability checks
Free Tier Value
This free tier appears to be fully open and perpetual, with no usage cap, trial clock, or credit-card gate mentioned. Because it is an uncapped always-free offering, there is no defensible monthly dollar equivalent to estimate against a paid plan.
What's included in the free tier
- Access to a free online TLS server scanner for checking server TLS configuration.
- Ability to test a TLS server on any port.
- Support for entering a domain name or IP address to check TLS settings.
- Ability to use advanced protocol options, including STARTTLS for common services.
See Test TLS pricing for current limits.
