How does the Key Matcher work?

The tool calculates and compares the MD5 hash of the public key modulus from both the private key and the certificate (or CSR). If they match, the keys belong to the same pair.

What is a 'Key Mismatch' error?

A key mismatch error occurs when the private key you are trying to use does not correspond to the public key in your SSL certificate.

🔑 Key Matcher

Key Matcher — Free SSL Private Key & Certificate Match Checker

Verify that your private key matches your SSL certificate or CSR. Prevent "Key Mismatch" errors during installation.

Match Keys

Private Key: Certificate or CSR:

Why Match Keys?

Before installing an SSL certificate, you must ensure that the private key matches the certificate. A mismatch will cause installation errors and prevent your SSL from working.

Common Scenarios:

Verify private key matches certificate before installation
Check if private key matches CSR before submitting to CA
Troubleshoot "Key Mismatch" errors

Key Matcher — Free SSL Private Key & Certificate Match Checker

Match Keys

Why Match Keys?

Common Scenarios:

Related SSL Tools

Certificate Decoder

CSR Decoder

SSL Checker