Key Matcher

Check which private keys, certificates and CSRs belong together, with the OpenSSL modulus check. Encrypted keys and .pfx files work. Runs in your browser.

A certificate only works with the private key it was issued for. When a server won't start ("key values mismatch", "the private key does not match the certificate"), or you have a folder of .key, .crt and .csr files and don't know which go together, this tells you: everything with the same public key is grouped. It also shows the value openssl x509 -noout -modulus | openssl md5 prints, so you can compare with a server.