SSL Certificate Checker
Check SSL certificate issuer, validity and expiry date.
How to Use the SSL Certificate Checker?
Check any website's SSL certificate: who issued it, which domains it covers and when it expires.
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Enter a domain name, such as example.com or www.example.com.
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Click the Check SSL button.
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See if the certificate is valid, trusted and matches the domain.
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Check the Days until expiry so you can renew on time.
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Review the issuer, covered domains and the full certificate chain.
Benefits of Using Our SSL Certificate Checker
Full certificate details
Issuer, validity dates, key size, protocol, fingerprint and every covered domain.
Expiry warnings
Get a clear warning when a certificate expires within 30 days.
Chain check
See the intermediate certificates that link your site to a trusted root.
Free and fast
Check any domain in seconds, no sign-up required.
Who Can Use This SSL Certificate Checker?
Website owners
Avoid scary browser warnings caused by expired certificates.
System administrators
Verify installations after renewals.
Developers
Debug HTTPS problems on new domains.
Security conscious users
Check who issued a site's certificate before entering data.
Frequently Asked Questions
Everything you need to know about the SSL Certificate Checker.
What is an SSL certificate?
An SSL certificate, technically a TLS certificate, proves a website's identity and enables encrypted HTTPS connections. It is what makes the padlock appear in your browser and keeps data like passwords and payments private in transit.
What happens when an SSL certificate expires?
Browsers show a full page security warning that tells visitors the connection is not private. Most people leave immediately, so traffic, sales and trust drop sharply until the certificate is renewed.
Why does it say the certificate does not match?
Each certificate covers specific domain names. If you visit www.example.com but the certificate only covers example.com, browsers show an error. Check the Domains covered list and reissue the certificate with all the names you use.
Are free SSL certificates safe?
Yes. Free certificates from authorities like Let's Encrypt use the same strong encryption as paid ones. Paid certificates may add extra validation of the organisation, warranties or support, but the encryption is equally secure.
How often should I check my SSL certificate?
Many certificates now last 90 days or less, so check monthly or set up automatic renewal with your host. This tool shows exactly how many days are left.