How this tool works
SSL/TLS tools parse certificate, CSR, key, or live handshake data with OpenSSL-compatible logic. They surface subject, issuer, SAN, validity, chain, format, and key-matching details so deployment issues are easier to isolate.
SSL / TLS
TLS Cipher / Protocol Checker
Check the negotiated TLS protocol and cipher, plus quick TLS 1.2/1.3 support tests.
Privacy note
Sensitive input is processed only for the current request and is not stored by this tool.
What is TLS Cipher / Protocol Checker for?
Checks the TLS protocol and cipher negotiated by a server, with quick TLS 1.2 and 1.3 tests. The output is organized for quick review, copying, and cross-checking with nearby tools in the SSL / TLS group.
Part of this tool group
Open nearby tools in the same group to cross-check, inspect deeper, or complete a small workflow.
Open SSL / TLS hubFrequently asked questions
When should I use TLS Cipher / Protocol Checker?
Checks the TLS protocol and cipher negotiated by a server, with quick TLS 1.2 and 1.3 tests. Use it when you need a quick, readable result before cross-checking with production data or related tools in the SSL / TLS group.
Should I verify the result before applying changes?
Yes. Treat the output as an operational aid: review the source input, compare it with authoritative systems, and test changes in the correct environment before rollout.
