Download SslDecoder Desktop

Decode certificates and CSRs securely — no data leaves your computer.

SslDecoder for Windows

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No signup · No email · Runs fully offline

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Getting started (1 minute)

  1. Extract the zip file to any directory
  2. Run SslDecoder.exe
  3. Paste or open a certificate or CSR

Displays decoded fields, extensions, and security checks instantly.

Need help at any point?

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