Free SSL/TLS Certificate Tools
Diagnose certificate issues, verify your TLS chain, and generate CAA records — no account required.
SSL Certificate Chain Checker
Verify your server's TLS certificate chain is complete and correctly configured. Checks for expired certificates, missing intermediates, hostname mismatches, and OCSP status.
Check your chain →CAA Record Checker & Generator
Look up existing CAA DNS records for any domain and generate new ones. Control which Certificate Authorities can issue certificates for your domain.
Check CAA records →Why Use These Tools?
SSL/TLS misconfigurations are one of the most common causes of website downtime and security warnings. An incomplete certificate chain, an expired intermediate, or missing CAA records can cause browsers to reject your site — even when your leaf certificate is perfectly valid. These free tools help you catch issues before your visitors do.
Need ongoing certificate monitoring?
CertShield monitors your certificates 24/7 and alerts you before they expire or change unexpectedly.
Start monitoring for free