Base64 File Encoder / Decoder

This tool allows you to encode files into Base64 format or decode Base64 data back into its original file form, all locally in your browser.

Encode file → Base64

Include data URL prefix

Decode Base64 → file

Base64 input Filename MIME type (optional)

Waiting for input.

How it works

When encoding, the tool reads the selected file and converts its binary data into a Base64 string. When decoding, it reconstructs the original file from valid Base64 input.

Common use cases

Common use cases include embedding files in JSON or XML, transmitting files through text-based systems, and testing file-based APIs.

Limitations

Large files may be limited by browser memory. Base64 encoding increases file size and does not provide security or encryption.