Base64 Encode & Decode Online
Encode and decode Base64, with URL-safe variant.
About this tool
Base64 maps every 3 bytes to 4 ASCII characters so binary data can travel through text-only channels — email, JSON, data URLs, JWTs. This tool encodes and decodes live with correct UTF-8 handling, including the URL-safe alphabet (- and _ replacing + and /).
Like everything on encrypt.tools, this runs entirely in your browser — nothing you enter is transmitted or stored.
Frequently asked questions about Base64
What is Base64 used for?+
It encodes binary data as text so it can travel through text-only channels — email attachments, JSON, data URLs, and JWTs. Every 3 bytes become 4 ASCII characters.
What is Base64URL?+
A URL-safe variant that replaces + and / with - and _ and drops padding, so the result is safe in URLs and filenames. JWTs use it.
Does it handle Unicode and emoji?+
Yes — text is encoded as UTF-8 first, so any Unicode, including emoji, round-trips correctly.