Base64 File Converter

Choose a file to encode

Base64 Output (or paste Base64 here to decode)

How to use this Base64 file converter

To encode: choose any file — it converts to a Base64 string automatically.
To decode: paste a Base64 data URI (starting with "data:") into the text box.
Click "Decode & Download File" to reconstruct and save the original file.

How does decoding work?

Paste a Base64 data URI (starting with "data:") into the text area and click download to reconstruct the original file — everything happens locally in your browser.

Why does Base64 make files bigger?

Base64 encodes binary data using only text-safe characters, which adds about 33% overhead — a necessary tradeoff for embedding files in text formats like JSON, HTML, or email.

Can I encode very large files?

Yes, but browser memory becomes the practical limit for very large files (typically hundreds of MB), since everything is processed in your device's RAM.