Free Tool
Free SSL Certificate Checker
Certificate health directly affects user trust, browser warnings, and SEO confidence. Verify your TLS setup in seconds.
- No login required
- Lightweight diagnostics
- Hosting-aware checks
SSL Certificate Checker
Check certificate issuer, validity period, SAN coverage, and expiry risk before visitors or search engines see trust warnings.
Enter a value and run your check.
How It Works
Designed for fast diagnostics with lightweight, server-side checks.
- 01
Enter a domain that serves HTTPS.
- 02
We perform a lightweight TLS handshake and read the certificate.
- 03
Review expiry windows and SAN coverage alerts.
Frequently Asked Questions
Quick answers for common checks and interpretation questions.
Can this checker test non-standard TLS ports?
This version checks standard HTTPS on port 443 for speed and broad compatibility.
How early should I renew certificates?
Most teams renew before the final 30 days to avoid accidental expiration.