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.
Guides
- What Is Base64 Encoding and When Should You Use It?
Base64 turns binary data into plain text so it can travel safely through systems built for text. Here's how it works and when you actually need it.
- Base64 vs Base64URL: Fix Invalid Characters and Missing Padding
Learn why Base64 decoding fails, how Base64URL changes the alphabet, and when to restore padding, with safe JavaScript examples.