Is PEM / Certificate Decoder free?

Yes, PEM / Certificate Decoder is completely free to use with no signup required.

Does PEM / Certificate Decoder send my data to a server?

No. PEM / Certificate Decoder runs entirely in your browser using client-side JavaScript. Your data never leaves your device.

Inspect X.509 SSL certificate keys and files client-side. Decodes Subjects, Issuers, Serial Numbers, and Expirations.

DevTab

Never leaves your browser

Decode X.509 certificates to extract Issuer, Subject, Expiry, and Serial Number details.

PEM Certificate Block Input

Decoded Certificate Metadata

The input does not match a valid base64-encoded X.509 certificate envelope. Check headers and footers boundaries.

Malformed PEM Envelope