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Paste binary — spaces, line breaks or commas between the bytes, it doesn’t matter — and read it as text. The bytes decode as UTF-8, so accents and emoji survive the trip; and when something isn’t right, the error names the offending character or byte offset rather than shrugging.
Paste 8-bit groups — spaces, line breaks and commas between them are all fine.
Bytes are UTF-8, the encoding the web actually uses — an accent or emoji becomes its real multi-byte sequence, not a question mark. Other encodings (UTF-16, Latin-1) aren’t guessed at: when pasted bytes aren’t UTF-8, the error names the byte offset instead of showing mojibake.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
Take the result to your clipboard, or save it as a file. Close the tab and nothing of what you pasted remains.