See whether a site’s HTTPS certificate is valid, who issued it, and when it renews.
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Frequently Asked Questions
The SSL checker displays certificate details including issuer, validity period, expiration date, days until expiry, certificate chain, and encryption details.
You can specify a custom port (default is 443). Enter the domain and port number to check SSL certificates on non-standard ports.
A certificate is valid if it's not expired, properly signed, and matches the domain. The checker verifies all these aspects.
Check your SSL certificate regularly, especially before expiration. Most certificates expire after 90 days, so checking monthly is recommended.