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Is your certificate healthy?

Paste a domain. We'll fetch its TLS certificate, check the validity window, and tell you exactly what we see.

Public certificates only Port 443 Live, no caching

Live, not cached

Every check opens a fresh TLS connection. What you see is what's actually being served right now.

Validity at a glance

Days remaining, the full lifetime window, and a clear signal when something's about to break.

Whole chain

Leaf, intermediate, root — plus every SAN. Everything a browser sees, surfaced cleanly.