Decode certificate
pem = -----BEGIN CERTIFICATE-----\nMIIB...-----END CERTIFICATE-----
Result: Certificate details decoded.
PEM Decoder
Paste a PEM block (certificate, CSR, or key) to decode it. Shows the type, Base64 content, and attempts to parse if it is an X.509 certificate. Never uploads data to the server unnecessarily.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
What is PEM format?
PEM (Privacy Enhanced Mail) is a Base64-encoded DER format wrapped with BEGIN/END markers. It is the most common format for certificates and keys.
Can I decode private keys?
This tool detects and warns about private keys but does not process them for security reasons. Use dedicated key management tools for private key operations.
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