▚ sandboxmax

Base64 to String Decoder

Pre-loaded with an encoded string so you can see the decoder work the moment the page loads — including the accented characters and emoji that break naive atob() implementations. It also forgives real-world mess: URL-safe Base64, stripped padding, and pasted data: URLs all decode fine.

runs 100% in your browser — text & files never uploaded

  1. 1Pick mode & directionText Mode for strings, File Mode for images and small files; encode or decode.
  2. 2Paste or dropConversion runs on every keystroke — UTF-8, URL-safe Base64, and data: URLs all handled.
  3. 3Copy or previewGrab the result with one click; decoded images render live in the preview sandbox.

Encoded and decoded with your browser’s native btoa/atoband FileReader — text and files never leave this tab.

More Base64 tools

/base64/encode-text-to-base64

Text to Base64 Encoder

/base64/convert-image-to-data-url

Image to Data URL Converter

Is it safe to paste sensitive data into the Base64 to String Decoder?

Yes. The Base64 to String Decoder runs 100% client-side inside your browser thread — nothing you paste is uploaded, logged, or transmitted. SandboxMax is a static site with no backend server, no cookies, and no trackers: open your browser's network panel while you work and you'll see zero requests leave the tab.