SSL Certificate Checker — Verify SSL Online Free

Target Domain

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Certificate Detail

Enter a domain to run a full SSL verification test.

Domain
Subject
Issuer
Valid From
Valid Until
Serial Number
Protocol
Alt Names (SANs)

Certificate analysis happens securely from our edge servers without leaving footprint traces.

Understand SSL/TLS Certificates

What is an SSL Certificate?

An SSL (Secure Sockets Layer) certificate encrypts the connection between your browser and a website. When you see the padlock icon in your browser's address bar, it means the site has a valid SSL certificate protecting data like passwords and credit card numbers from interception.

How we verify the certificate

This tool securely connects to the specified domain using modern TLS protocols to scrape public certificate components. From there, it parses validity periods, Certificate Authorities (CA), and Subject Alternative Names (SAN) exactly as your web browser does.