SSL Checker - Check SSL Certificate & Expiry Online
Use this free SSL checker tool to instantly verify SSL certificate details for any domain. Check certificate issuer, validity dates, TLS version, serial number, expiration status, and days remaining before expiry. This tool helps website owners, developers, and system administrators ensure their SSL configuration is secure and up to date.
What is an SSL Certificate?
An SSL (Secure Sockets Layer) certificate encrypts communication between a user’s browser and a website server. It ensures secure data transmission, protects sensitive information, and builds user trust by enabling HTTPS. SSL certificates are issued by trusted Certificate Authorities (CAs) such as Let's Encrypt, DigiCert, and GlobalSign.
What Information Does the SSL Checker Provide?
- Issuer Details: Certificate authority information
- Subject (Common Name): The domain secured
- Serial Number & Version: Certificate identification
- Valid From / Valid Until: Certificate validity period
- Days Remaining: Time before expiration
- Expiration Status: Whether the certificate is valid or expired
- TLS Version: Security protocol version in use
Why Check SSL Certificate Expiry?
An expired SSL certificate can cause browser security warnings, negatively impact SEO rankings, and reduce user trust. Regularly checking SSL validity helps prevent downtime, maintain secure HTTPS connections, and ensure compliance with modern web security standards.
Who Should Use an SSL Checker Tool?
Website owners, developers, IT administrators, DevOps engineers, and cybersecurity professionals can use this SSL checker to monitor certificate status, verify encryption settings, and maintain a secure online presence.