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Check a certificate

Enter a hostname to see what TLS certificate its server presents.

Enter a bare hostname — no https://, no port. Certline connects on port 443. Certline cannot reach hosts behind Cloudflare — see below.
Connecting to server…
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Chain completeness
Issuer
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Subject
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Subject Alternative Names (SANs)
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Valid from
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Serial number
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Fingerprint
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Chain depth
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Duration
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No accounts, no saved history. Certline answers when you ask it. Nothing is stored, nothing survives a cleared browser, and no email, alerts, or reminders are sent. Learn more about Certline