# Base64 File Converter

URL: https://phishdestroy.io/developer-tools/base64-file-converter
Category: Files & pages
Where it runs: Runs locally (nothing you enter is uploaded)

Drop or choose a file to get it as a Base64 data URI, or paste a data URI to decode it back into a downloadable file.

## Example input

A small image

```
A small PNG file, dropped onto the box or chosen by clicking it
```

The box below fills with data:image/png;base64,... and a line shows the original size, the Base64 size and the overhead: Base64 is about a third larger than the file.

## FAQ

### What does it produce?

A data URI of the form data:type;base64,data, using the MIME type your browser reports for the file. Base64 makes the data about a third larger, and it is an encoding anyone can reverse, not encryption.

### Why does Decode & Download do nothing?

It only accepts a one-line data URI with a single MIME type, such as data:image/png;base64,...; extra parameters like ;charset=utf-8, line breaks or invalid Base64 make it fail without a visible message. Files decoded from phishing attachments can be harmful, so check them with File Type Sniffer before opening.

### Is the file uploaded?

No. The file is read with the FileReader API and the data URI is built on this page; nothing is uploaded. There is no size limit, so very large files can freeze the tab.

## Related tools

- [Base64 Encoder / Decoder](https://phishdestroy.io/developer-tools/base64-encoder-decoder)
- [File Type Sniffer](https://phishdestroy.io/developer-tools/file-type-sniffer)
- [File Hash Calculator](https://phishdestroy.io/developer-tools/file-hash)
- [Multi-Layer Decoder](https://phishdestroy.io/developer-tools/multi-layer-decoder)
- [HTML Attachment Analyzer](https://phishdestroy.io/developer-tools/html-attachment-analyzer)

All tools: https://phishdestroy.io/developer-tools