Base64 Encode & Decode

Fast, simple, and secure. Works offline once loaded.

All processing stays in your browser
Encode
Text → Base64
Decode
Base64 → Text
File to Base64
Upload a file and download its Base64 as a .txt
Browser-only
Data URL format: data:<mime>;base64,<data>
Converting...
Note: Large files can take longer and may hit browser memory limits. For huge files, this should be a server-side tool.

Tip: This tool supports Unicode characters. Emojis and non-English text are safe.