Free network tool
SSL Checker
Verify the SSL certificate of any domain — validity, issuer, expiry and days remaining.
Live results. Public network data is never stored.
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Why use this tool
SSL/TLS certificates encrypt the connection between browsers and servers. This tool connects to a domain over HTTPS and inspects its certificate.
Check expiry dates before a renewal surprise, confirm the issuer, and see whether the certificate covers the domain (SAN).
Features
Certificate validity and issuer
Expiry date and days remaining
Subject and subject-alternative names
Full server authentication check
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How it works
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1
Enter a domain
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2
Click "Check"
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3
Review validity, issuer and expiry
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Frequently asked questions
How do I check my SSL certificate expiry?
Enter your domain here. The result shows the exact expiry date and days remaining.
Why is my certificate invalid?
It may be expired, for the wrong domain, or the chain may be incomplete. Renew and reinstall if needed.
How long do SSL certificates last?
Maximum 398 days for new certificates since 2020. Most providers issue 90-day to 1-year certs.