SSL Certificate Checker
Check SSL certificate validity and expiration dates
Check a domain's SSL/TLS certificate to see its validity, expiration date, issuer, and the hostnames it covers. Catching an expiring or misconfigured certificate before it breaks HTTPS prevents the browser warnings that scare away visitors and block API clients.
How to use SSL Certificate Checker
- Enter the domain or hostname you want to check.
- Run the check to fetch the certificate details.
- Review the expiry date, issuer, and covered domains.
- Renew or reconfigure ahead of expiration if needed.
Frequently asked questions
How early should I renew before expiry?
Renew well before the expiration date (at least a couple of weeks) to allow time for issuance and deployment and to avoid any window of downtime or browser warnings.
Why does my certificate show as invalid?
Common causes include an expired certificate, a hostname mismatch, an incomplete chain, or an untrusted issuer. The check surfaces which condition applies.
Does it cover wildcard and multi-domain certs?
Yes. The check lists the hostnames a certificate is valid for, including wildcard and Subject Alternative Name entries.
Related Web & Network tools
- HTTP Status Code Lookup: Look up HTTP status codes with examples
- User Agent Parser: Parse user agent strings to extract browser and device info
- IP Address Lookup: Get location and network info for IP addresses
- DNS Lookup Tool: Check DNS records (A, MX, TXT, etc.) for any domain name
- Server Status Checker: Check server health and monitor website availability
- SEO Analyzer: Analyze and optimize your website's SEO performance