Convert text into binary code and back (8-bit, UTF-8) - locally in your browser, with no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
In a computer every letter is ultimately a sequence of zeros and ones. This tool makes that level visible: it converts your text into its binary representation - each byte as eight bits - and likewise back again. That is useful for learning, for illustrating how character encoding works, or to make a binary message readable again.
The tool detects the direction automatically. Text is encoded via its UTF-8 bytes, so umlauts, accents and emojis are mapped correctly too - they then occupy several bytes. When converting back, the groups of eight become bytes again and the original text is reconstructed losslessly. Spaces between the groups of eight are ignored, so you can paste binary in any common notation.
The whole conversion runs entirely locally in your browser in pure JavaScript - your text is not uploaded, not stored, and no foreign library is loaded from a CDN. You can download the result as a text file or copy it straight out.
| Input formats | Text input |
|---|---|
| Output format | TXT |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: Encoding is via UTF-8 bytes in groups of eight (8 bits per byte). When converting back, the number of bits must be a multiple of eight, otherwise the tool reports an honest error. Spaces between the groups are ignored. Multi-byte characters occupy several groups of eight accordingly.
No. The conversion runs entirely locally in your browser; your text never leaves your device and is not stored.
Yes. The text is encoded via its UTF-8 bytes, so umlauts, accents and emojis are mapped correctly too; they then occupy several groups of eight.
As a sequence of zeros and ones whose count is a multiple of eight. Spaces between the groups of eight are allowed and are ignored.
If the number of bits is not a multiple of eight, the tool reports an honest error instead of producing a wrong result.