Base64 encode/decode — text, files, data URLs

Handle Base64 for email attachments, API requests, and CSS image embedding, all in one place. Files are processed entirely on your device.

The file is never sent to a server — processed entirely in this browser

URL-safe (-_, no =) Line break every 76 characters (MIME)

Text

Base64

Decoding automatically handles spaces, line breaks, the URL-safe format (-_), omitted trailing =, and data URLs.

How to use Base64 encode/decode

1Enter text to get Base64, or enter Base64 to get the original text back instantly.
2Turn on [URL-safe] if you need the format used in JWTs and URLs.
3In the File tab, convert a file to Base64 or a data URL, or paste Base64 and save it as a file.

Korean text comes out garbled.

Another tool may have processed it as EUC-KR or Latin-1. This tool encodes and decodes using the standard, UTF-8.

Is Base64 encryption?

No. It's just a reversible encoding that anyone can undo, so never use it to protect passwords.