What is an SSL/TLS certificate and why does it need to match my domain?

An SSL/TLS certificate is a digital credential that encrypts data between users and your server. The certificate must match your domain name to prove you own the domain and prevent man-in-the-middle attacks. When a certificate doesn't match the domain, browsers display security warnings, reducing user trust.

How can I check if my SSL certificate matches my domain?

Use Certificate Matcher by entering your domain name and pasting your certificate content. The tool instantly compares the certificate's Common Name (CN) and Subject Alternative Names (SAN) against your domain. It will clearly indicate whether they match or if there are any mismatches.

What does certificate mismatch mean and how do I fix it?

A certificate mismatch occurs when the domain in the certificate doesn't match the domain you're using. This causes browser warnings and security errors. To fix it, obtain a new certificate issued for your specific domain, or request a reissue from your Certificate Authority with the correct domain information.

Can Certificate Matcher detect fraudulent or self-signed certificates?

Yes, Certificate Matcher validates certificates against trusted certificate authorities and checks cryptographic signatures. It can identify self-signed certificates, detect invalid signatures, and flag certificates issued by untrusted authorities, helping you spot potential security threats.

Is Certificate Matcher safe to use with sensitive certificate data?

Certificate Matcher processes all data locally in your browser without storing or transmitting sensitive information to external servers. Your certificate data is never logged or saved, making it safe for verifying production certificates and sensitive security credentials.

Certificate Matcher

Certificate (PEM)

Private Key (PEM)

How to Use Certificate Matcher

When to Use Certificate Matcher

🔒Need an SSL certificate?

Protect your website with BKNS SSL — from 199,000đ/year, free installation

Buy SSL

Certificate Matcher

How to Use Certificate Matcher

When to Use Certificate Matcher

Technical Information

Frequently Asked Questions