# Free SSL/TLS Tools: Checker, CSR, Decoder, Converter

> 20 free SSL/TLS tools: check certificates and chains, generate CSRs and TLS configs, decode and convert certificates. Private keys stay in your browser.

Source: https://ssl.sh/tools/
Last updated: 2026-11-10

ssl.sh has 20 free SSL/TLS tools of two kinds. Checkers connect from our server to the host you name, as a browser would, and report the certificate chain, TLS versions, HSTS, CAA records and more. Generators, decoders and converters run in your browser: keys are created with WebCrypto and pasted certificates are parsed locally.

Every check is also available from a terminal with `curl ssl.sh/example.com` and through the JSON API described in the API documentation. For daily checks, call the JSON API from a scheduled script; ssl.sh Monitor, which will do this for you and alert you before expiry, is in development.