John’s Base64 Encoder / Decoder

John's Base64 Encoder/Decoder is a program for encoding and decoding text in Base64.

Base64 literally means a positional number system with a base of 64. Here 64 is the highest power of two (26), which can be represented using ASCII printable characters. This system is widely used in e-mail to represent binary files in the text of an e-mail (transport coding). All commonly known variants, known as Base64, use the characters A-Z, a-z and 0-9, which is 62 characters; different systems use different characters for the missing two characters.