Base64 Decode Online
Use Base64 Decode Online, review the result, and keep the original until the output is checked.
Input Text
Output
How to use Base64 Decode Online
- Paste the encoded string into the box, or Upload File to load a text file of Base64 - the result renders as you type.
- Set Character Set to match how the sender encoded it; UTF-8 (Unicode) is the safe default for modern text.
- Press Validate first if the string came from an unknown source, and check the Encoding Type readout says Standard or URL Safe.
- Switch Output Format to Hexadecimal or Binary to inspect the raw bytes, then Copy or Download the decoded result.
What Base64 Decode Online actually does to your file
A data URI prefix such as data:image/png;base64, is understood, so you can paste a whole data URI without trimming it, and Auto Detect MIME Type names the payload. Input that cannot be Base64 is refused instead of guessed at: the output box then says why - an illegal character, or a string that uses the URL-safe alphabet with "-" and "_" and needs that box ticked - rather than handing back partially decoded junk. Text that comes back as mojibake was stored as raw bytes rather than encoded from UTF-8 - try ASCII or Latin-1 before assuming the string is damaged. Downloads are named decoded.txt, decoded.hex or decoded.bin.
Base64 Decode Online FAQ
What does Base64 Decode Online do?
Instantly decode Base64 strings to text or files online for free. Secure, no installs, unlimited use with live preview—perfect for developers.
Which files work with Base64 Decode Online?
This category commonly supports text, images, and binary files. Use the accepted file types shown in the uploader, because support varies by browser and by the engine behind each tool.
Is Base64 a way to protect data?
No. Base64 is reversible by anyone who has the text and adds about a third to the size. Treat it as an encoding, not as encryption or compression.
Will my original file be changed?
No. You paste text or open a file to read it, the result appears in the other pane, and only what you copy or download leaves the page.
How is my file processed?
It is not uploaded. The processing is done locally by the encoder bundled with this page, so the practical ceiling is your device's memory and the limit shown beside the uploader - no queue, no account, no copy on a server.
Is the Base64 Decode Online free?
Yes. The Base64 Decode Online is free with no trial limit, subscription, or watermark on downloads. You can use it for personal and commercial projects without creating an account.