SSL Certificate Checker

Verify SSL/TLS certificate validity, expiration, and security configuration

About SSL Certificates

SSL/TLS certificates are essential for securing websites and protecting data transmitted between browsers and servers. They encrypt sensitive information like passwords, credit card numbers, and personal data.

What Our SSL Checker Analyzes

Certificate Validity: Whether the certificate is currently valid and not expired
Expiration Date: When the certificate will expire and needs renewal
Certificate Chain: The full chain from your certificate to the root CA
Protocol Version: The TLS version in use (TLS 1.2, 1.3, etc.)
Cipher Strength: The encryption algorithm and key size
Subject Alternative Names: All domains covered by the certificate

Understanding SSL Grades

A+Excellent - Modern TLS 1.3 with strong encryption

AGood - Valid certificate with good configuration

BAcceptable - Minor issues or weak key size

FFailed - Expired, invalid, or insecure

Frequently Asked Questions

What is an SSL/TLS certificate?

An SSL/TLS certificate is a digital credential that encrypts data between a visitor's browser and your web server. It enables HTTPS, shown by the padlock icon in browsers, protecting sensitive information like passwords and payment details.

How do I know if my SSL certificate is about to expire?

Our SSL checker shows the exact expiration date and days remaining. Most certificates last 90 days (Let's Encrypt) or 1 year (paid CAs). Set up monitoring or calendar reminders 30 days before expiry to avoid downtime.

What does each SSL grade mean?

Grade A+ indicates top security with modern TLS 1.3, strong ciphers, and HSTS. Grade A is excellent. Grades B-C suggest outdated protocols or weak ciphers. Grades D-F indicate serious vulnerabilities that need immediate attention.

Do I need an SSL certificate for my website?

Yes. SSL certificates are essential for SEO (Google ranks HTTPS sites higher), user trust (browsers mark HTTP sites as "Not Secure"), and data protection. Free certificates from Let's Encrypt make there no reason not to have one.