Security
SSL Certificate Checker
Inspect a site’s SSL/TLS certificate — who issued it, when it expires, and whether the chain is valid.
This free tool is launching soon
What this tool checks
- The certificate’s expiry date
- Who issued the certificate
- Whether the certificate chain is complete
- Whether the certificate matches the domain
Why it matters
An expired or misconfigured certificate takes a site from working to fully blocked in browsers, with no warning in your application logs. Checking the expiry date and chain ahead of time gives you room to fix it before visitors see a security warning.
FAQ
Common questions
How early should I renew a certificate?
Most teams act around two weeks before expiry. That leaves time to renew and deploy without the warning becoming background noise.
What is a certificate chain?
A certificate is trusted through a chain of intermediate certificates up to a root authority. If a server omits an intermediate, some clients will reject the certificate even though it is valid.
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