To check the SSL certificate on a .uk or .co.uk site, enter the domain above and press Check. You'll see when the certificate expires, how many days are left, who issued it, which names it covers and whether browsers trust the chain. UK certificates follow the same rules as any other, so a .co.uk site needs nothing different.
How to read the result
- Expiry date and days left: when the certificate stops being valid. After that date, browsers warn visitors before they reach the site.
- Issuer: the certificate authority that signed the certificate. It's usually the one your host or your SSL seller uses.
- Names: the domains the certificate covers. If yourshop.co.uk is listed and www.yourshop.co.uk isn't, anyone who types the www address gets a warning.
- Chain: whether browsers trust the path from your certificate up to a root they know. When it fails, a missing intermediate certificate on the server is the usual cause, and your host can add it.
How long a certificate lasts now
A short expiry is normal. Every publicly trusted certificate follows the CA/Browser Forum's Baseline Requirements, and they now cap a new certificate at 200 days. The cap falls to 100 days next, then to 47 days.
Most hosts renew certificates automatically. Check again after the renewal should have happened. If the expiry date hasn't moved, the renewal failed and your host needs to know.
From the CA/Browser Forum's Baseline Requirements, read in October 2026.
What this checker doesn't check
Each check reads one domain on port 443. It doesn't test whether the certificate has been revoked, it doesn't grade protocols or ciphers, and it doesn't look at mail servers or other ports. It reads the certificate your server sends at that moment, so after a fix on your host, press Check again to see the new one.
This sSL checker is free with no signup. SearchBlueprint, who make it, sell SEO planning for websites: which searches each page should answer.