Base64 Encode / Decode

Encode and decode Base64 text entirely in your browser.

How to use

1Paste plain text to encode, or Base64 to decode, into the input box.
2Click Encode to convert text to Base64, or Decode to reverse it. UTF-8 characters are supported.
3Use Copy to place the result on your clipboard, or Clear to reset the editor.
4Keep large payloads under the character limit shown in the status area for smooth browser performance.

Does my text leave my device?

No. Encoding and decoding run entirely in your browser. Nothing is uploaded to a server.

Why does Decode fail?

The input must be valid Base64. Remove stray spaces if needed, and check for missing padding characters (=).

Can I encode files?

This tool works on text. For binary files, convert them to text elsewhere first, or use a dedicated file encoder.

Is Unicode supported?

Yes. Text is converted with UTF-8 before Base64 encoding, and decoded back to Unicode on Decode.