Fast File Convert

Base64 to file

Paste a Base64 string and this tool decodes it back into the original binary file, ready to download. It accepts both raw Base64 and full data URIs.

Processed locally in your browser. Files are cleared when you leave the page.

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Why use Base64 to file?

Small utility jobs — packaging files into an archive, generating a QR code, encoding data — usually send you to an unfamiliar website that wants an upload. Running them here keeps the task in your browser, takes a couple of seconds and leaves no copy behind.

How to use Base64 to file

  1. 1Paste the Base64 string into the text field.
  2. 2Press Convert now.
  3. 3The decoded file appears in the results list.
  4. 4Download it.

Features

  • Accepts raw Base64 and data:… URIs.
  • Decoding happens locally — pasted payloads are never transmitted.
  • Works with any file type.

Supported formats

Input
Base64 text or data URI
Output
The original file

Your privacy

This tool runs entirely in your browser using JavaScript and WebAssembly. The file you select is read into your device's memory, converted there and offered back as a download — it is never uploaded to our servers. Closing or reloading the page clears it. If you are signed in, we store only the tool name, the number of files and their total size so you can see your own activity history; the file contents are never sent.

Read the full privacy policy

Tips for the best result

  • Give downloaded files a descriptive name so you can find them later.
  • Test generated QR codes with a real phone camera before printing them.
  • For archives, group related files first — the structure you select is the structure you get.

Frequently asked questions

Why does decoding fail?

The string is usually truncated, or contains stray line breaks or characters that are not part of the Base64 alphabet. Paste the complete value.

How is the file type determined?

From the MIME type in a data URI when present; otherwise a generic binary file is produced that you can rename.

Is the pasted data sent anywhere?

No. The conversion runs in your browser with JavaScript and WebAssembly, so the file never leaves your device and nothing is uploaded to our servers.

Is it free?

Yes. Every tool on Fast File Convert is free to use, with no account and no daily limit.

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