Base64 File Encoder / Decoder

Encode any file to Base64 or decode Base64 back to its original binary file.

How it works

Upload any file (PDF, ZIP, images, executables, etc.) and it will be converted to a Base64 string. Large files are processed in chunks to maintain browser responsiveness.

MIME Type Detection

When decoding, the tool automatically detects the file type from magic bytes (the first few bytes of the file), so you can download the file with the correct extension.