Base64 encode and decode
Handles Unicode correctly (most quick implementations mangle Japanese), and turns any file into a data: URI you can inline.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Paste text and press Encode or Decode.
- Or drop a file to get its data: URI.
- Copy the result.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see are the tool’s own code and, once cached, none at all.
Frequently asked questions
Is Base64 encryption?
No, and treating it as such is a recurring security incident. It is a way of writing bytes using 64 safe characters; anyone can decode it instantly. It also makes data 33% bigger.
Does anything leave my browser?
No. There is no server behind this page doing the work and no API being called — the whole tool is JavaScript running in the tab. Load it once and it keeps working with the connection off.