Base91 Encoder / Decoder
Encode binary-safe text with basE91 and decode it back.
Encode text with basE91, a more compact ASCII encoding, and decode Base91 values back into UTF-8 text.
Mode
How to use
- Choose Encode or Decode mode.
- Enter text or a Base91 string.
- Copy the converted result.
Frequently asked questions
Is Base91 more compact than Base64?
Usually yes, basE91 encodes about 13 bits per character for better density.
Are invalid characters rejected?
Yes, decoding stops with an error if a character is not in the Base91 alphabet.
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