SSL Checker Online
Inspect active TLS and server root certificates client-side using Cloudflare APIs.
How to use SSL Checker
- 1Enter the domain name (e.g. example.com) you want to check.
- 2Click 'Check SSL' to retrieve the certificate details.
- 3Review the certificate's validity period, issuer, subject, and chain status.
Privacy & security
SSL certificate checks are performed via an API that queries the target domain's TLS certificate. Only the domain name you enter is shared with the API.
Only the domain you enter is sent to the SSL checking API. No other data is collected.
Frequently asked questions
What does this checker show?
Certificate validity dates, issuer (CA), subject/domain names, certificate chain status, TLS protocol version, and days until expiry.
Why does my SSL certificate show as expired?
SSL certificates have limited validity (typically 90 days for Let's Encrypt, 1-2 years for commercial CAs). They must be renewed regularly.
What is an SSL chain error?
A chain error occurs when intermediate CA certificates are missing or incorrectly installed. Browsers can't verify the certificate's trust path, causing security warnings.