Base64 Encode & Decode

A simple, secure, and fast tool to encode or decode Base64 strings — all processed in your browser.

Enter your text or Base64 string

Advanced Options

URL-safe encoding (use -_ instead of +/)

Split into 76-char lines (MIME standard)

Encode each line separately

Result

About Base64

Base64 encoding converts binary data into ASCII characters for safe transmission over text-based systems like email (MIME), JSON, or URLs. This tool runs entirely in your browser — no data is ever sent to a server.