SSL checker: is your certificate healthy?
Check the SSL certificate on any website: who issued it, which names it covers, when it expires, whether the chain is trusted and which TLS version your server negotiates.
- Free, no sign-up
- Results in seconds
- Public data only
Three steps, a few seconds.
We connect to your server
Exactly like a browser, on port 443.
We validate the certificate
Trust chain, hostname match, expiry date, key strength and signature.
We flag what matters
Expiry within 30 days, a broken chain or an old TLS version are called out.
Why will certificates expire more often?
The CA/Browser Forum approved shorter maximum lifetimes, stepping down from 398 days to 47 days by 2029. Automated renewal is becoming essential.
What is an incomplete chain?
Your server isn't sending the intermediate certificate. Some browsers and apps will fail to connect. Install the full chain from your certificate provider.
Can you check internal servers?
This tool only checks public websites. We can review internal certificates as part of a security assessment.
More free tools.
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