SSL / TLS certificate check

Verify certificate validity, chain trust, and expiry at a glance.

Default: 5000

How to interpret SSL findings

This checker is useful during migrations, certificate renewals, and incident response. It helps you confirm that public visitors receive a trusted chain and that hostname coverage is correct for the URL you are testing.

Validity
Shows whether the certificate is currently valid and trusted for a standard HTTPS client.
Chain trust
Flags missing or broken intermediates that often cause browser trust warnings.
SAN coverage
Confirms that the requested hostname appears in Subject Alternative Names and matches expected domains.
Pair SSL checks with Uptime Check for reachability and Headers Checker for HSTS and related header policies.

FAQ

What to review first?
Check validity, chain trust, and days until expiry before diving into issuer and SAN details.
Valid cert, untrusted chain?
That usually indicates missing intermediates or incorrect certificate chain delivery at the server or proxy layer.
When to rotate certificate?
A practical target is renewal before 30 days remaining to reduce operational risk.

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