File to Base64 Converter
Encode any file as Base64 or a data URL, or decode Base64 into a downloadable binary file. Files stay in your browser.
Choose a file
Select a file from your device. It stays in your browser while this tool runs.
Choose your options
The default settings work for most files.
How to use File to Base64 Converter
- Choose a file to encode, or select Base64 to file and paste encoded data.
- Choose raw Base64 or a data URL for encoding.
- Run the conversion and copy the text or download the decoded bytes.
File encoding without changing bytes
Use this tool for binary API fields, small attachment payloads, and data URLs. Unlike a text encoder, it reads the original file bytes, so image and document contents are preserved. Base64 expands data by roughly one third before any transport compression. Keep large assets as files when the receiving API supports them.
Decode with a neutral filename
The decoder accepts standard Base64 and Base64 data URLs, ignores whitespace, and downloads the result as decoded.bin. Rename it only when you know the original format. It does not execute, render, or open decoded content. URL-safe Base64 is a different alphabet and is rejected. Inputs are limited to about 20 MiB of decoded data.
Does Base64 encrypt a file?
No. Anyone with the encoded text can recover the original bytes. Treat encoded confidential files as confidential.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.