Base64 Decoding

Some error messages

What is Base64 Decoding?

Base64 decoding is the process of converting data that has been encoded in Base64 format back to its original form. Base64 is a method of encoding binary data using 64 different characters. This is useful because some systems, such as email or HTML, do not allow certain characters, so encoding the data in Base64 allows it to be transmitted without issues.

To decode Base64 data, the encoded text is first split into blocks of 4 characters. Each block represents 24 bits of the original data. The 24 bits are then split into 4 groups of 6 bits each, and each group is converted into a single Base64 character using a lookup table. The resulting characters are then concatenated to form the decoded data.

Base64 decoding is commonly used in many applications, including email attachments, image and file transfer, and web applications.


  1. Base64 on Wikipedia