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CRT Decoder & Key Matcher

Decode PEM certificates, inspect SANs & validity, and verify private key match.

About CRT Decoding & Key Matching

Inspects the inner X.509 structure of your PEM certificate and mathematically verifies whether a private key matches the certificate.

Extracts Subject and Issuer Distinguished Names (DN).
Checks expiration date and days remaining until renewal.
Lists all SANs covered (wildcards and multi-domain).
Compares modulus (n) & exponent (e) with your private key.

100% Client-Side Privacy

All parsing and cryptographic modulus matching are performed locally inside your browser. No private keys, certificates, or company identifiers are ever transmitted across the network.

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CRT Decoder & Key Matcher

Subject (Issued To)

Issuer (Issued By / CA)

Cryptographic Specifications

Subject Alternative Names (SANs)

Validity Period