Free SSL Certificate Checker

What is an SSL Certificate?

An SSL (Secure Sockets Layer) certificate is a digital certificate that encrypts the connection between a visitor's browser and your web server. It ensures that sensitive data — passwords, credit card numbers, personal information — travels securely and cannot be intercepted by third parties.

When a site has a valid SSL certificate, browsers display a padlock icon in the address bar and use the HTTPS protocol. Without one, browsers flag your site as "Not Secure," which erodes visitor trust and drives people away.

Modern SSL certificates are issued by trusted Certificate Authorities (CAs) such as Let's Encrypt, DigiCert, and Sectigo. They typically last 90 days to 1 year and must be renewed before expiry to avoid service disruptions.

Why SSL Monitoring Matters

An expired SSL certificate is one of the most common — and most preventable — causes of website downtime. When your certificate expires, every visitor sees a full-page browser warning that effectively blocks access to your site. For e-commerce and SaaS businesses, even a few hours of SSL downtime can mean significant revenue loss.

Search engines also penalize sites with invalid certificates. Google has confirmed that HTTPS is a ranking signal, so an expired cert doesn't just scare visitors — it pushes you down in search results.

Automated SSL monitoring removes the guesswork. Instead of manually checking expiry dates, a monitoring service like Valpero tracks your certificates 24/7 and sends alerts days before they expire, giving you time to renew without any interruption.

What This Tool Checks

• Certificate validity — whether the SSL certificate is currently valid and trusted by browsers
• Issuer — the Certificate Authority that issued the certificate (e.g., Let's Encrypt, DigiCert)
• Expiry date — the exact date and time when the certificate expires
• Days remaining — how many days until expiry, color-coded for urgency