Press any key. This is a Base64 decoder. Base64 is a format for encoding data into text characters. 64 text characters are used, each representing 6 bits. This converter converts Base64 into a list, with each list item representing 8 bits, or 1 byte. The list of bytes is on the right, and the list of just the numbers each text character represents is on the left. You can find out more about Base64 on its Wikipedia article: https://wikipedia.org/wiki/Base64 The article has some handy tables that provide a visual representation. You can use this for anything you want.
I think this may be the 1st Base64 decoder on Scratch. I made it because I found an online converter that could convert files into Base64 containing the entire data of the file, and converting the Base64 back into bytes will let you read the entire file in Scratch. Who can figure out what the file is that's already loaded when you start the project?