SSL Checker by Certificate Authority
Select your certificate authority for CA-specific guidance alongside live verification. Check certs from Let's Encrypt, DigiCert, Sectigo, GoDaddy, and more.
- Live TLS handshake
- Trust & chain validation
- Expiry countdown
- TLS 1.0–1.3 detection
SSL Checkers by Certificate Authority
Verify SSL certificates from any of the 10 major certificate authorities. Get CA-specific chain details alongside live certificate verification.
Let's Encrypt SSL Certificate Checker
Check Let's Encrypt SSL certificates. Verify trust via ISRG Root X1, confirm the 90-day expiry, and check chain completeness. Free Let's Encrypt certificate checker.
Use toolDigiCert SSL Certificate Checker
Verify SSL certificates issued by DigiCert. Check trust, chain, expiry, and certificate details for DigiCert DV, OV, and EV certificates. Free DigiCert checker.
Use toolSectigo SSL Certificate Checker
Check SSL certificates issued by Sectigo (formerly Comodo CA). Verify trust via USERTrust RSA CA, chain, and expiry for Sectigo DV, OV, and EV certificates. Free.
Use toolGoDaddy SSL Certificate Checker
Verify SSL certificates issued by GoDaddy. Check trust, chain via Go Daddy Secure Server CA, expiry, and installation for GoDaddy SSL certificates. Free checker.
Use toolGlobalSign SSL Certificate Checker
Verify SSL certificates issued by GlobalSign. Check trust via GlobalSign Root R3/R5, chain completeness, and expiry for DV, OV, and EV certificates. Free checker.
Use toolCloudflare SSL Certificate Checker
Check SSL certificates issued or managed by Cloudflare. Verify Universal SSL, Advanced Certificate Manager, and Cloudflare Origin Certificates. Free, live checker.
Use toolGoogle Trust Services SSL Checker
Check SSL certificates issued by Google Trust Services (GTS). Verify trust via GTS Root R1, chain, and expiry for Google-issued certificates. Free GTS cert checker.
Use toolAmazon & AWS SSL Certificate Checker
Check SSL certificates issued by Amazon's CA, including AWS Certificate Manager (ACM). Verify trust via Amazon Root CA, chain, and expiry. Free AWS cert checker.
Use toolZeroSSL SSL Certificate Checker
Check SSL certificates issued by ZeroSSL. Verify trust via Sectigo's chain, 90-day expiry, and chain completeness for ZeroSSL ACME-issued certificates. Free checker.
Use toolEntrust SSL Certificate Checker
Check SSL certificates issued by Entrust. Verify trust status following Chrome's 2024 distrust action, chain, and expiry. Critical if you use Entrust certificates.
Use toolHow the SSL checker works
Check any SSL certificate online in three simple steps — no signup, no downloads.
1. Enter a hostname
Type any domain or subdomain — for example example.com or mail.example.com. You can paste a full URL; we'll clean it up automatically. Add :port for non-standard ports.
2. We connect live
RunSSLCheck opens a real TLS connection to the server and inspects the exact certificate it presents — no cached data and no third-party API.
3. Read your results
See trust status, hostname match, expiry countdown, the full certificate chain, key strength, and which TLS versions are enabled.
Everything you need to check SSL certificates
A complete SSL certificate checker that goes beyond a simple pass or fail.
Trust & installation check
Confirms the certificate is valid, trusted by major browsers, and that all intermediate certificates are correctly installed.
SSL certificate expiry check
Shows the exact validity window and a clear countdown of days remaining so you can renew before visitors ever see a warning.
Full certificate chain
Visualizes the path from your server certificate up to the trusted root CA, with downloadable PEM for every certificate.
Key & protocol analysis
Reports key type and size, signature algorithm, and detects every supported TLS version from 1.0 to 1.3.
Frequently asked questions
Common questions about this SSL checker tool.