Base64 Decoder
Decode Base64 to text online. Supports full Unicode text, not just plain ASCII.
Your Base64 is decoded entirely in your browser. Nothing is sent to a server.
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How to use this tool
- 1Paste the Base64 string you want to decode.
- 2The decoded text appears automatically below as you type.
- 3Copy the result or download it as a .txt file.
Features
- Decodes as you type — no button to click.
- Full Unicode support on the decoded output, not just plain ASCII.
- Clear error message if the input is not valid Base64.
- Copy result to clipboard, or download as a .txt file.
- No account or sign-up required.
Privacy
Your Base64 input is decoded entirely in your browser. It is never sent to a server, logged or stored.
Frequently asked questions
Is this Base64 decoder free?
Yes. You can decode unlimited Base64 for free, with no sign-up required.
What happens if my Base64 is invalid?
You'll see a clear message that the input is not valid Base64, instead of a cryptic error or a blank result.
Does it support non-English decoded text?
Yes. The decoded output correctly handles full Unicode text — accented letters, CJK characters and emoji — not just plain ASCII.
Is my data sent to a server?
No. Decoding happens locally in your browser using native JavaScript APIs.