Encoder / Decoder
Encode and decode Base64, URL, HTML entities, ROT13, and JS string escapes — plus file to Base64.
How to Encode and Decode Online for Free
1. Pick a mode — Base64, URL, HTML entities, ROT13, String Escape, or File to Base64.
2. Choose Encode or Decode, then type or paste your text.
3. The output updates automatically as you type.
4. Use the swap button to feed the output back in, or copy either side.
Encoding in Your Browser
All encoding, decoding, and file reading happen inside your browser. Nothing you paste or upload is ever sent to a server.