What this tool does
Decode valid Base64 into UTF-8 text. Invalid characters, length, padding, or UTF-8 content produce an error so you can check the input.
- Ordinary whitespace added during copying can be ignored.
- Targets UTF-8 text only; arbitrary binary files are not suitable for text output.
- Exceptions will be caught and will not crash the entire page.
How to use it
- Paste the Base64 string.
- Click "Base64 Decode".
- If the input is valid, view the recovered Unicode text.
- Copy the desired results.
Common uses
- View the Base64 text value in the configuration.
- Validate encoding roundtrips for Chinese, Japanese, and emoji.
- Troubleshoot incorrect padding or non-UTF-8 data.
Base64 Decode Features
Recover multilingual Unicode text by strictly checking Base64 and then decoding it as UTF-8. Review the result, then copy it for use.
FAQ
Why can some Base64 decode into bytes but still report an error?
It may not be UTF-8 text. This page uses strict UTF-8 decoding to avoid displaying any binary as corrupted characters.
Is it possible to input Base64 with line breaks?
Yes, the tool will remove common whitespace before validating.
How to deal with invalid padding?
An invalid Base64 message appears if characters are misplaced or the = padding is incorrect. Check the input and try again.