This tool encodes the given data with ASCII85. Ascii85 is a form of binary-to-text encoding similar to Base64, developed by Adobe Systems. This type of encoding is used in PostScript and PDF files.
You might also like the online ASCII85 Decoder.
The advantage over Base64 is that the resulting text is only 25% larger from the original, in comparison with the 33% extra space needed for a Base64 encoded text.
The disadvantage is that ASCII85 uses more characters in the encoding, opposed to Base64 which uses only 64 and can be easily transported on text channels.