Quick answer
Binary text tools usually show each encoded byte as eight bits. ASCII maps values 0–127 to characters, while UTF-8 uses the same bytes for ASCII and multi-byte sequences for other Unicode characters. Keeping eight-bit boundaries and the original encoding is essential for a correct round trip.
How to do it
- Encode the source text as UTF-8 bytes.
- Render every byte as exactly eight binary digits.
- For decoding, validate each group, rebuild the bytes, and decode with UTF-8.
ASCII is a subset, not all text
English letters, digits, punctuation, and control characters fit in seven-bit ASCII. A byte such as 11100010 by itself may be only the start of a UTF-8 sequence. Converting each byte independently to a visible character produces garbled output.
Why leading zeros matter
Binary 00000101 and 101 have the same numeric value, but fixed eight-bit groups preserve byte alignment in a stream. Removing zeros makes it difficult to know where one byte ends and the next begins.
Common mistakes to avoid
- Splitting a UTF-8 sequence into separate characters.
- Accepting groups containing digits other than zero and one.
- Assuming binary representation hides or encrypts the text.
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