This is because Base64 format only has 64 characters: 26 uppercase alphabet letters, 26 lowercase alphabet letters, 10 numeric characters, and the "+" and "/" symbols for the new line.īase64 doesn't use all the ASCII special characters, but only these few. However as we said earlier, Base64 converts the data in 8 bit binary form to chunks of 6 bits. You can see here that each character is represented by 8 bits. The first step is to convert this string into binary. Suppose we have a string "Go win" and we want to convert it into a Base64 string.
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