Base64

Base 64

Intro

Base64 (also known as tetrasexagesimal) is a group of binary-to-text encoding

Performance

concerns

Base64 encoding causes an overhead of 33–37% relative to the size of the original binary data (33% by the encoding itself; up to 4% more by the inserted line breaks).

Code

kotlin lang | encode base64

val encoded = Base64.Default.encode("Hello, World!".encodeToByteArray())
println(encoded) // SGVsbG8sIFdvcmxkIQ==

val decoded = Base64.Default.decode(encoded)
println(decoded.decodeToString()) // Hello, World!

RFC

RFC states only support for 64 characters

So Base64 string can contain + and / , but can it cannot contain other special characters such as $, |, ', * ?

RFC 4648 | section 4

Tools

base64 encoder

validator