Base64 Encoder & Decoder (UTF-8 & URL-Safe)

Base64 encoding translates binary or 8-bit data into a radixed 64-character ASCII representation suitable for transmission over text-only protocols like HTTP, email (MIME), and JSON.

Standard Base64 vs URL-Safe Base64

In standard Base64 (RFC 4648 §4), the 62nd and 63rd characters are + and /, with = used for padding. When passed inside URL query strings or path parameters, these characters cause issues (e.g. + becomes a space).

URL-Safe Base64 replaces + with - (hyphen) and / with _ (underscore), and frequently omits the trailing = padding. Our tool supports both formats with a single toggle!