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SSL/TLS Certificate Decoder

Decode PEM/CSR files to view expiry, SANs, and issuer details.

Free to use

Certificate Details

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About SSL/TLS Certificate Decoder

Decode PEM/CSR files to view expiry, SANs, and issuer details.

How to use this tool

  1. Enter the requested data or choose an upload.
  2. Check the file type and size limit before submitting.
  3. Review the result, then download or copy it.
  4. Keep the original and use the actions above to continue safely.

Read the full SSL/TLS Certificate Decoder guide →