Base64 Decode

Decode Base64-encoded text back to its original form. Supports multiple character sets and line-by-line decoding.

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Source character set Specify the character set used during the original encoding. It is usually UTF-8.

Decode each line separately — Useful when you have multiple independent entries separated by line breaks.

Base64 Encoding Explained

Why do I need Base64 encoding?

Base64 is an encoding scheme used to represent binary data in an ASCII format. This is useful when binary data needs to be sent over media designed to handle textual data. Concrete examples include sending images in an XML file or in an email attachment.

How does Base64 encoding work?

Bytes forming the data are broken into buffers of 24 bits (3 bytes at a time). The resulting buffer is then broken into 4 packs of 6 bits each. Those 6 bits form a number corresponding to the index in the Base64 character set (A–Z, a–z, 0–9, + and /). If the number of bytes is not a multiple of three, padding is added: == for 1 remaining byte and = for 2 remaining bytes.