SSL Certificate Checker
Test your domain's TLS/SSL certificate status, verify expiration dates, check Certificate Authority (CA) chains, and avoid costly browser security warnings.
Want automated alerts before your SSL expires?
Enable 24/7 Certificate & Uptime Monitoring →Frequently Asked Questions
Why is checking SSL certificates important?
An expired or misconfigured SSL certificate triggers full-page browser security warnings ("Your connection is not private"), devastating site trust, converting visitors away, and damaging Google search rankings.
How often should SSL certificates be renewed?
Most modern certificates (like Let's Encrypt or Google Trust Services) are valid for 90 days and should be renewed at least 30 days prior to expiry. Up or Not continuously monitors certificates and notifies you before they lapse.
What are Subject Alternative Names (SANs)?
SANs allow a single SSL certificate to protect multiple hostnames, such as yourdomain.com and www.yourdomain.com or wildcards like *.yourdomain.com.