Base64 Encode & Decode

Encode text or files to Base64, or decode Base64 back to text or a downloadable file. Free, fast, and your files never leave your device.

Plain text

Base64

Drag & drop a file here, or click to browse (encode any file to Base64 / data URI)
preview

Decode Base64 to a file

How to use the Base64 Encoder/Decoder

  1. Choose "Text" mode to encode/decode plain text, or "File" mode to work with files.
  2. In text mode, type or paste on either side and click "Encode" or "Decode".
  3. In file mode, drag & drop or browse for a file to instantly get its Base64 string or data URI.
  4. To turn a Base64 string back into a file, paste it into the decode box, set a filename, and click "Decode & download file".

Why use ZillaKit's Base64 Encoder/Decoder?

Base64 encoding is everywhere — embedding images in CSS, sending binary data in JSON APIs, or storing small files inline. ZillaKit's tool handles both text and binary files entirely in your browser, is fully UTF-8 safe (so emoji and non-Latin scripts encode and decode correctly), and can produce ready-to-use data URIs for images and fonts. Decoding works in reverse too: paste a Base64 string and download it straight back into a file, no matter the original file type. Everything runs client-side with the native browser APIs, so there is no upload, no size cap beyond your device's memory, no signup, and no cost for everyday use.

FAQ

Does this tool handle Unicode text correctly?

Yes. Text encoding uses UTF-8 byte conversion under the hood, so emoji, accented characters, and non-Latin scripts encode and decode correctly.

Can I encode any file type, not just images?

Yes, any file can be converted to a Base64 string or data URI, including PDFs, archives, and executables.

What is a data URI and when should I use it?

A data URI embeds the MIME type alongside the Base64 data (e.g. data:image/png;base64,...) so it can be used directly in an HTML img src or CSS background without a separate file request.

Is my file uploaded to a server?

No. All encoding and decoding happens locally using your browser's built-in APIs. Files never leave your device.

Can I decode Base64 back into the original file?

Yes, paste the Base64 (or data URI) into the decode box, choose a filename, and the tool reconstructs and downloads the original binary file.