SSL Key Matcher

Verify if a private key matches an SSL certificate

Private Key

Certificate

Key Information

Type

Size

Certificate Subject

Error

About Key Matcher

Our free Key Matcher verifies whether a private key matches an SSL certificate. Paste both the certificate and private key to instantly check if they form a valid pair. Essential for debugging SSL installation issues where the key doesn't match the certificate.

How to Use

1Paste your SSL certificate (PEM format) in the first text area.
2Paste your private key (PEM format) in the second text area.
3Click "Check Match" to verify if they correspond to the same key pair.

Use Cases

•Verify key-certificate pair before server deployment
•Debug SSL errors caused by key mismatch
•Confirm backup keys match certificates
•Validate cert + key after CA issuance

Technical Details

Comparison Method

Public key modulus comparison
PEM input supported

Performance

Instant verification
No network requests required

Tips & Best Practices

•Always verify key match before deploying to production
•If mismatched, check if you have multiple key files and use the correct one
•Keep backups of your keys matched with their certificates

Frequently Asked Questions

The certificate and key were generated separately. You need to regenerate the CSR with the same key, or obtain a new certificate.

Paste PEM-encoded certificates. Convert DER to PEM first using the SSL Converter tool.

Check if the certificate was reissued with a new key, or if the wrong key file was uploaded to the server.

Video Tutorial

Video tutorial coming soon