📤 Base64 to File Decoder
Paste Base64 text or a full data URI and get the original file back as a download, decoded locally, never uploaded.
Paste raw Base64 or a full data: URI and get the original file back. If you paste a data URI, its MIME type is detected automatically; otherwise pick a file name with the right extension. 🔒 Decoding runs entirely in your browser, nothing is uploaded.
How the base64 to file decoder works
The tool takes your Base64 (raw, or a complete data:<mime>;base64,… URI) and reverses the encoding back into the original bytes, then hands you a download. If you paste a data URI, it reads the MIME type from it automatically; for raw Base64 you choose a file name with the right extension. Whitespace and line breaks in the input are ignored, so pasted blocks work fine.
This is the inverse of the File-to-Base64 encoder, useful when an API response, config file or email embeds a file as Base64 and you need the real file back. Only standard Base64 (and base64 data URIs) are supported; URL-encoded or other non-base64 data URIs aren’t files in disguise. Everything is decoded in your browser, so sensitive payloads stay on your device.
Frequently asked questions
How do I convert Base64 back to a file?
Paste the Base64 text (or a full data: URI), set a file name with the correct extension, and click Decode & download. The tool reconstructs the original bytes and saves them.
Do I need to include the data: prefix?
No, both work. If you paste a complete data:<mime>;base64,… URI the MIME type is detected automatically; if you paste raw Base64, just give the download a file name with the right extension (e.g. .png, .pdf).
Why does decoding say my input is invalid?
The text isn’t valid Base64, usually because characters are missing, extra text was copied in, or it’s a non-base64 (e.g. URL-encoded) data URI. Copy the full, unbroken Base64 and try again.
Does it handle line breaks in the Base64?
Yes, whitespace and newlines are stripped before decoding, so multi-line Base64 blocks paste in without a problem.
Is my data uploaded?
No, decoding runs entirely in your browser and the file is generated locally, so nothing is transmitted and it works offline.