Convert Base64
Encode UTF-8 text as Base64 or decode Base64 back to UTF-8 text locally.
Processed in your browser. Decode mode expects Base64 that represents UTF-8 text.
Mode
Encode text or decode Base64 text.
Privacy notes
Base64 text is processed in this browser tab. NoNoiseTools does not need to upload the input for this tool.
Base64 is not encryption. Avoid pasting credentials, tokens or private payloads unless you understand browser-side tools and trust this device.
How this Base64 converter works
Encode mode turns text into UTF-8 bytes and writes Base64. Decode mode validates Base64, converts it back to bytes and then decodes those bytes as UTF-8 text.
Base64 encoding vs encryption
Base64 is a reversible text encoding. It can make bytes safe to copy through text systems, but it does not protect secrets or hide data from anyone who can decode it.
Unicode and UTF-8 text
The encoder supports Unicode by encoding text as UTF-8 first. The decoder is focused on text and shows a clear message if valid Base64 decodes to bytes that are not valid UTF-8.
Privacy notes
Base64 text is processed in the browser. NoNoiseTools does not need to upload the input to a server for this tool.
Decoded Base64 may reveal readable secrets. Avoid pasting credentials, tokens or private payloads unless you understand browser-side tools.
What this tool does not include
It does not upload input, decode binary files, inspect JWTs, decrypt data, validate credentials or store pasted history.
Key terms and assumptionsShort notes about UTF-8 text, validation, whitespace handling, browser processing and Base64 limits.
- UTF-8 text
- Encode mode converts text to UTF-8 bytes before writing Base64. Decode mode expects UTF-8 text bytes.
- Whitespace handling
- Decode mode can ignore ASCII whitespace so wrapped Base64 lines are accepted.
- Invalid Base64
- Invalid characters, impossible padding and truncated Base64 are blocked with a calm error.
- Encoding only
- Base64 is reversible encoding, not encryption or hashing.
- Browser processing
- Text is converted in the browser tab. No upload endpoint is needed for this tool.
Related tools
Browse the Developer tools hub for more browser-based developer utilities.
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- Character Counter Count characters with spaces, characters without spaces, words and lines from pasted text.
- Line Counter Count total lines, non-empty lines and blank lines in pasted text.
FAQs
Is Base64 encryption?
No. Base64 is an encoding format. Anyone can decode it.
Is my Base64 text uploaded?
No. The conversion happens in your browser for this tool.
Can this encode Unicode text?
Yes. The tool encodes text as UTF-8 before converting it to Base64.
Why does decoding fail?
The input may have invalid Base64 characters, incorrect padding or bytes that are not valid UTF-8 text.
Can this decode files or images?
No. This version is focused on text, not binary file conversion.
Why is the Base64 result longer?
Base64 represents bytes using text characters, so encoded output is usually larger than the original text.
Should I paste secrets here?
Avoid pasting secrets unless you understand browser-side tools and trust the device and page.