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Certificate Decoder

Paste a PEM-encoded certificate to decode and inspect its details. Everything runs in your browser.

1 Paste
2 Decode
3 Inspect
Paste Certificate

Drop your certificate file here or click to browse

Supported formats:

.CRT .CER .PEM
or paste manually
Paste the full PEM block including BEGIN/END markers
Your certificate never leaves your browser. All decoding runs locally via JavaScript — no data is transmitted to any server.
How It Works
1

Paste PEM

Paste a PEM-encoded certificate

2

Decode

Certificate is parsed entirely in your browser

3

Inspect

View subject, issuer, validity, SANs, and more

What is PEM?

PEM (Privacy-Enhanced Mail) is a Base64-encoded format for certificates, enclosed between -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- markers.

You can obtain a PEM certificate from your web server config, a certificate authority, or by exporting from a keystore or PFX file.

Completely Private & Secure
  • Zero network transmission — your certificate and file are never sent to any server
  • 100% browser-based — decoding runs entirely in JavaScript on your device
  • No cookies, no tracking, no storage — nothing is logged or persisted
  • Works offline — once loaded, the tool functions without an internet connection

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