Toolbench

X.509 certificate viewer

Decode PEM or DER certificates: subject, issuer, validity, serial, and extensions for TLS debugging.

Paste a PEM block (e.g. BEGIN CERTIFICATE) or raw base64/DER; the library normalizes common encodings. For verification against a trust store, use your OS or openssl.

Processing runs in your browser when possible. We do not upload your files to our servers for these tools unless explicitly stated. How we handle files & data.

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