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Use the same mode you used to generate the numbers. ASCII homework that lists 72 101 108 108 111 should decode to Hello in ASCII mode. Unicode mode is for larger values, including emoji scalars.
Non-numeric tokens and out-of-range values stop with an error at the offending position. ASCII mode is strict: 128 is not allowed. That is deliberate so you catch rubric mistakes early.
No hex input like 41 or 0x41, no HTML entities like A, and no UTF-8 byte sequences as decimals. For binary bytes, use Binary to Text instead.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.
Decimal ASCII (0–127) or full Unicode code points — pick the mode that matches your spec.
Encode text as UTF-8 bytes shown as 8-bit binary groups (not UTF-16 code units).
Decode space-separated 8-bit binary back to UTF-8 text; invalid chunks show a clear error.
UPPERCASE, lowercase, Title Case, sentence case, camelCase, snake_case, kebab-case, and CONSTANT_CASE — in your browser.
Instantly count words, characters, sentences, and paragraphs in your text.
Tabs to spaces, collapse runs of spaces, trim line ends, and optionally collapse extra blank lines.
