SSL Checker Tools
Browse all RunSSLCheck tools. Check SSL certificate expiry, chain, trust, hostname match, TLS versions, and more — by feature, error type, CA, or platform.
- Live TLS handshake
- Trust & chain validation
- Expiry countdown
- TLS 1.0–1.3 detection
SSL Certificate Checker Tools
Inspect every aspect of an SSL certificate — expiry, chain, trust, hostname, TLS versions, and more.
SSL Certificate Expiry Checker
Free SSL certificate expiry checker. Enter any domain to see the expiration date, days remaining, and whether renewal is needed. Live check, no cached data.
Use toolSSL Certificate Chain Checker
Check your SSL certificate chain. Visualize every cert from server to trusted root, identify missing intermediates, and download PEM files. Free, no signup.
Use toolSSL Trust Checker
Check if your SSL certificate is trusted by major browsers. RunSSLCheck validates against the system trust store via a live TLS handshake. Free, instant, no signup.
Use toolSSL Hostname Checker
Check if your domain is covered by its SSL certificate. RunSSLCheck validates the Common Name and all SANs for hostname match. Diagnose hostname mismatch errors instantly.
Use toolTLS Version Checker
Check which TLS versions (1.0, 1.1, 1.2, 1.3) a server supports. Identify deprecated protocols that violate PCI DSS and put users at risk. Free, live probe.
Use toolSSL Checker for Any Port
Check SSL certificates on non-standard ports. Enter hostname:port (e.g. mail.example.com:587) and RunSSLCheck connects directly. Supports IMAPS, LDAPS, HTTPS alternatives.
Use toolWildcard SSL Certificate Checker
Check wildcard SSL certificates. Enter any covered subdomain to verify trust, expiry, and the full SAN list. Free online wildcard SSL certificate checker.
Use toolSubdomain SSL Checker
Check SSL on any subdomain. Verify whether a subdomain is covered by a dedicated cert, wildcard, or SAN entry. Free subdomain SSL certificate checker, no signup.
Use toolSSL Certificate Details Checker
View full SSL certificate details: issuer, subject, serial number, SHA-256 fingerprint, key type, key size, SANs, and signature algorithm. Free online cert analyzer.
Use toolHTTPS Checker
Check if your website has a valid, trusted HTTPS connection. Verify SSL certificate trust, chain, and expiry — everything needed to confirm HTTPS is properly configured.
Use toolSSL Error Diagnostic Tools
Diagnose specific SSL errors and certificate problems. Find the exact cause of browser security warnings.
SSL Certificate Expired Checker
Check if an SSL certificate has expired. Enter any domain to see expiry status, the exact expiration date, and steps to fix an expired certificate. Free, instant.
Use toolSSL Certificate Not Trusted Checker
Diagnose 'certificate not trusted' SSL errors. RunSSLCheck checks trust, certificate chain, root CA, and identifies why browsers reject your certificate. Free, instant.
Use toolSSL Chain Incomplete Checker
Check for incomplete SSL certificate chains and missing intermediate certificates. RunSSLCheck shows exactly where the chain breaks. Free, live chain checker.
Use toolSSL Hostname Mismatch Checker
Diagnose SSL hostname mismatch errors. RunSSLCheck checks the Common Name and SANs to identify exactly which domains the certificate covers and why the mismatch occurs.
Use toolSSL Certificate Not Yet Valid Checker
Diagnose 'certificate not yet valid' SSL errors. RunSSLCheck reads the notBefore date to identify certificates served before their activation date. Free, instant.
Use toolSelf-Signed Certificate Checker
Detect self-signed SSL certificates that cause browser trust errors. RunSSLCheck identifies when a certificate is signed by itself rather than a trusted CA. Free, instant.
Use toolDeprecated TLS Version Checker
Check if a server still supports deprecated TLS 1.0 or TLS 1.1. These protocols are insecure and banned by PCI DSS. Free live TLS version probe — no cached data.
Use toolSSL Certificate Expiring Soon Checker
Check if an SSL certificate is expiring soon. RunSSLCheck shows exact expiry date, days remaining, and renewal urgency. Catch expiring certs before visitors see warnings.
Use toolSSL Checkers by Certificate Authority
CA-specific guidance alongside live certificate verification. Check certs from Let's Encrypt, DigiCert, Sectigo, and more.
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 toolSSL Checkers by Platform
Platform-specific guidance for WordPress, Shopify, Cloudflare, AWS, Nginx, and more.
WordPress SSL Certificate Checker
Check the SSL certificate on your WordPress site. Verify trust, expiry, and chain for WordPress.com or self-hosted WordPress. Works with any SSL provider. Free checker.
Use toolShopify SSL Certificate Checker
Check the SSL certificate on your Shopify store. Verify trust, expiry, and chain for Shopify-provisioned certificates on custom domains. Free Shopify SSL checker.
Use toolSSL Checker for Cloudflare Sites
Check SSL on Cloudflare-proxied domains. See the certificate Cloudflare serves at the edge, verify Universal SSL, and diagnose SSL mode configuration issues. Free checker.
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.