SSL checker
Check your SSL certificate in seconds: expiry date, hostname coverage, chain trust, TLS version, key strength and HSTS.
What the SSL checker tests
The certificate problems that cause browser warnings and failed connections.
Expiry
Days until the certificate expires, with a warning well before it does.
Hostname and trust
Whether the certificate covers your domain and chains to a trusted authority.
Protocol and key
The negotiated TLS version, cipher, key type and size.
HSTS
Whether browsers are told to always use HTTPS.
How it works
Enter a domain
Any public domain served over HTTPS.
We open a TLS connection
The certificate and handshake details are read directly from your server.
Fix what's flagged
Each finding explains the risk and the fix.
This connects to port 443 on the domain you enter. For a deep protocol and cipher analysis, a dedicated TLS scanner goes further.
Questions
Enter the domain. The checker confirms the dates, the hostname match and that the chain leads to a trusted certificate authority.
The server is not sending the intermediate certificate. Browsers sometimes recover, but API clients and many apps fail. Serve the full chain.
Usually an expired certificate, a hostname mismatch or an untrusted chain. The checker shows which one.
Check every security setting at once
Headers, TLS, cookies, DNS records and exposed files in one free scan.
Run free audit