Inspect expiry, issuer, SANs, and fingerprint for an HTTPS host — client-visible certificate check, not a full SSL Labs grade.
- Free
- No signup
- Fast
- Privacy-friendly
Free · API · MCPToolYour platform
Use SSL/TLS Certificate Checker three ways
The free SSL/TLS Certificate Checker on this page works in your browser. The same workflow is available via REST API for apps and via MCP for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the security-apis module under Security Tools.
- Free in browserUse SSL/TLS Certificate Checker here — no account required.
- REST APICall from your server with
X-Api-Key. - MCP for agentsConnect Cursor or Claude to ToolYour MCP with the same key.
- 1. Get an API keySign in and open Dashboard → API Keys (works for REST and MCP).
- 2. Call or connectUse the REST API from your server, or paste the MCP URL into your agent config.
- 3. Same qualityOutput matches the free web tool across all three surfaces.
What is SSL/TLS Certificate Checker?
Before a cert expires in production, you need subject, issuer, validity window, SANs, and fingerprint for an HTTPS host. ToolYour SSL/TLS Certificate Checker connects to the host, reads the peer certificate, and reports days remaining with pass/warn/fail findings. Scope is client-visible certificate inspection — not a Qualys SSL Labs full grade (cipher suites, protocol matrix, and chain trust quirks may differ). REST/MCP: /api/v1/security-apis/ssl-tls-certificate-checker.
What are common questions about SSL/TLS Certificate Checker?
Is this the same as SSL Labs?
No. We inspect the certificate presented to a TLS client (expiry, SAN, issuer, fingerprint). We do not produce a full protocol/cipher grade.
Why require https://?
Certificate inspection needs a TLS handshake. Use an https URL (port 443 by default).
What are the key features of SSL/TLS Certificate Checker?
Expiry countdown
Days remaining with warn under 30 days and fail when expired or under 14.
SAN and fingerprint
Subject alternative names and SHA-256 fingerprint for inventory and pinning notes.
How do you use SSL/TLS Certificate Checker?
Enter an https URL
Hostname is taken from the URL; custom ports are supported.
Review findings
Check expiry, issuer, and whether SANs match the host you expected.
Honest scope
Useful for renewal ops and quick host checks. Follow with your CA/ACME monitor and a periodic SSL Labs or similar deep scan for cipher policy.
Where do you browse more security tools tools?
- Security Tools tools
Browse the full Security Tools category on ToolYour.
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