~/tools/ssl-tls/certificate-decoder
Certificate Decoder
Decode a certificate, CSR or bundle, and check whether a certificate, key and CSR belong together.
Everything happens in your browser
Certificates, CSRs, private keys and match results are parsed and compared locally with WebCrypto — nothing pasted here is uploaded, logged, or sent to a server. Closing this page clears it all.
Key matcher
Paste any two — a certificate, its private key, or the CSR it was issued from — to check they share the same key pair.