Free SSL certificate checker
Paste a URL to check its SSL certificate instantly — whether it's valid, trusted by a real certificate authority, and how many days until it expires. An expired certificate throws a full-page browser warning that scares off every visitor, so it pays to know before it lapses.
What this checks
We connect to the site over TLS, read the certificate, and report three things: is it currently valid, is the chain trusted, and the days remaining until expiry. Self-signed and untrusted certificates are flagged too — they break browsers just like an expired one.
When to renew
Renew at least two weeks before expiry to leave room for validation and DNS propagation. Even with auto-renewal (Let's Encrypt), scripts fail silently — a monitor is the safety net.
Monitor it automatically
Checking by hand doesn't scale across client sites. Sitefolio watches every site's certificate and emails you before any lapse — turning a weekend emergency into a calendar note.
Frequently asked questions
How many days before expiry should I renew?
At least 14 days, to allow validation and propagation without any gap in coverage.
Does auto-renewal make this unnecessary?
No — auto-renew scripts fail more often than expected. Checking confirms the live certificate is actually valid and trusted.
Uptime, SSL, domain, performance, SEO and links — with white-label client reports.
Get started free