paulobrien.dev

Tools SSL checker

SSL checker

Free, no account

Check the SSL certificate on your mail server or website. You see straight away whether it's valid and how many days it has left, every detail of the certificate and its chain, and, in plain English, who renews it: whether it renews itself or has to be renewed where it was bought.

Free for everyone, up to 20 checks a day. Only the certificate the server hands out is read. Nothing is kept beyond a count for your daily allowance.

Example report

brightwell.co.uk

62
Valid62 days left. Renewed automatically by Cloudflare.
✓Expires6 Jan 2027
✓Covers this nameyes, 2 names
✓Trustedyes
✓Issued byGoogle Trust Services
✓KeyEC P-256
✓ConnectionTLS 1.3
✓Renewalautomatic

// what it checks

What you get.

Valid or not

Expiry with the days left, whether it covers the name you typed and whether browsers and mail apps trust it.

Every detail

Names covered, issuer, dates, key, signature, serial number, fingerprints and the full chain up to the trusted root.

Where to renew it

Who looks after it, from the issuer and the host: renews itself, your web host, or renew where you bought it, with the steps.

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