UUUP Tools

Encoding & Decoding

Ascii85 (Base85) Encode and Decode

Convert between text and Ascii85 (Base85), including common <~ … ~> delimited form. Useful for PDF streams, some legacy systems, and reverse-engineering snippets. Encoding and decoding run locally in the browser.

Quick switch→Base64 Encode/Decode
Base85Ascii85Encoding
Quick switch:Base64 Encode/DecodeBase32 Encode/DecodeBase58 Encode/Decode

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Use cases

  • Decode Ascii85 blocks that start with <~
  • Encode text to Base85 for comparison
  • Handle Ascii85 fragments exported from PDF or legacy systems

How to use

  1. Enter plaintext or Ascii85 text
  2. Encode or decode
  3. Copy the result

Example input and output

Text

Hello

Ascii85

<~87cURDZ~>

FAQ

How does Base85 differ from Base64?

Ascii85 typically represents 4 bytes with 5 printable characters, so density is higher than Base64. Alphabet and padding rules also differ; it is common in PDF streams.

Are <~ ~> delimiters required?

The tool recognizes and normalizes common Ascii85 forms. Decoding without delimiters may still work when characters are valid, but keeping standard delimiters helps verification.

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