Paste text, pick a target case, and copy the result. Sentence case capitalises after each full stop, question mark, and exclamation mark; title case capitalises every word without flattening acronyms like NASA that are already uppercase; toggle case inverts each letter individually. Handy for fixing headlines pasted from elsewhere, normalising imported data, or undoing a caps-lock accident.
Most online text tools send whatever you paste to a server, run the work there, and send a result back. Your words sit in someone else's logs, backups and databases, and you have to trust a privacy policy.
Local-first means the opposite: the whole tool is downloaded to your browser and runs on your own device. Nothing you type is transmitted anywhere: not to us, not to anyone. There is no server that could receive it, which is a stronger guarantee than a promise not to look.
Three consequences worth knowing:
You do not have to take that on trust. Open your browser's developer tools, watch the network panel, and type: nothing appears in it.The network's verify page walks through the same check on every Jamuny tool.
The same input in each mode
the NASA report was published. it is public.
Title: The NASA Report Was Published. It Is Public. Sentence: The nasa report was published. It is public. Upper: THE NASA REPORT WAS PUBLISHED. IT IS PUBLIC.
Title case capitalises the first letter of every word, which suits headings and column labels. Sentence case lowercases everything first, then capitalises only the opening letter of each sentence, which suits body text and is what you want after rescuing a paragraph from caps lock.
Notice from the example that they are not interchangeable: sentence case flattens NASA to nasa, because lowercasing everything is the first thing it does. If your text contains acronyms you care about, title case is the safer starting point.
Title case here only raises the first letter of each word and leaves the remaining letters exactly as you typed them. NASA stays NASA rather than becoming Nasa, and iPhone keeps its lowercase i.
Many converters lowercase the whole word before capitalising its first letter, which destroys every acronym and every deliberately-cased brand name in the text. That is a silent change you will not notice until someone else does.
Word boundaries are detected using Unicode letter properties rather than the English alphabet, so accented characters, Cyrillic, Greek and other scripts convert correctly instead of being treated as separators. A name like "josé maría" title-cases to "José María" rather than breaking at the accent.
Converters that split on the ASCII range instead treat an accented letter as a boundary, which produces "José MaríA", capitalising the letter after the accent as though a new word had started. It is the kind of error that survives review because it only shows up in the rows nobody spot-checked.
Toggle inverts each letter individually: uppercase becomes lowercase and lowercase becomes uppercase, character by character. It is the one mode with no editorial opinion about words or sentences.
Its real use is rescuing text typed with caps lock on while holding shift for the letters that should have been capitals, which produces exactly inverted text, like "hELLO tHERE". Nothing else fixes that in one step, because the correct output depends on the original intent rather than on any rule about position.
For text that is simply all uppercase, sentence case is what you want instead. Toggle would turn it entirely lowercase, including the letters that should have stayed capital.
Title case capitalises the first letter of every word, which suits headings. Sentence case lowercases everything first and then capitalises only the opening letter of each sentence, which suits body text.
No. Title case only raises the first letter of each word and leaves the remaining letters as you typed them, so NASA stays NASA rather than becoming Nasa.
Yes. Word boundaries are detected using Unicode letter properties rather than the English alphabet, so accented characters and non-Latin scripts convert correctly.