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Z85 Encoder

Enter text to encode it as a Z85 (ZeroMQ base-85) string.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Z85 is the base-85 binary-to-text encoding defined by the ZeroMQ project's ZMTP/spec:32 specification, designed to pack binary data into printable ASCII more densely than base64: base64 expands data by roughly 33%, while Z85's 85-symbol alphabet expands it by only 25%, encoding every 4 bytes of input into exactly 5 output characters.

Because that 4-byte grouping is fixed, Z85 requires the input length to be a multiple of 4 bytes, so encoders zero-pad shorter inputs before converting. Z85 is best known as the encoding ZeroMQ itself uses for its CURVE security public and secret keys, making them safe to print, log, or paste as plain text.

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