How it works
- You paste or type into the box and pick a mode. The text stays in that field — it is never sent to a server or written to storage.
- Upper and lower case use the browser's locale-aware case mapping, which handles accented characters and non-Latin scripts correctly rather than only touching A–Z.
- Title case lowercases the text and then capitalises the first letter of every word boundary. Sentence case lowercases everything and capitalises the first letter of the text and the first letter after each terminal punctuation mark and space.
- The conversion runs on each keystroke and on each mode change, in plain JavaScript, so the output below updates as you type. Switching modes re-derives from the original text rather than from the previous output, which is why you can move between modes without the result degrading.
- Output is derived, never stored. Copy what you need before you close the tab.
Limitations
Title case here capitalises every word, which is the mechanical definition and not what most style guides mean. Chicago, AP and the rest lowercase articles, coordinating conjunctions and short prepositions unless they start or end the title. If you are setting a headline to a house style, this gets you most of the way and the small words need a manual pass.
Names with internal capitals do not survive. McDonald becomes Mcdonald, O'Brien becomes O'brien, iPhone becomes Iphone, and any acronym in the middle of a sentence loses its capitals in sentence and title mode. There is no reliable way to detect these automatically without a dictionary, and a wrong guess is worse than an obvious one — so the tool does the predictable thing and leaves the fixes to you.
Sentence case relies on terminal punctuation to find sentence starts. Text with abbreviations such as 'Dr.' or 'e.g.' gets a capital after them, and text written without full stops gets exactly one capital at the very beginning.
Above roughly two million characters this stops keeping up, because the conversion re-runs on every keystroke. Convert the text in two parts.
Questions
Is my text uploaded?
No. The text stays in the field and is processed in this tab. Nothing is posted, logged or kept after you close it.
What are the limits?
It keeps up comfortably into the hundreds of thousands of characters. Above roughly two million the conversion falls behind your typing, since it re-runs on every keystroke. Split the text and convert each half.
Why is my title case wrong for a style guide?
Because it capitalises every word, including 'the', 'of' and 'and'. Chicago and AP both lowercase most short words inside a title. Fix those by hand — there are usually two or three per headline, and no automatic rule gets them right in every case.
Why did McDonald become Mcdonald?
Because sentence and title case lowercase the whole string before capitalising word starts, and there is no dictionary telling the tool that this particular word has a capital in the middle. The same happens to O'Brien, iPhone and acronyms. Correct them after converting.
Do I need an account?
No. There is no sign-up, no email step and no usage counter. The tool is paid for by the ads on this page.
When people use it
The most common arrival is text pasted from somewhere that shouted. A product name copied from a listing in full capitals, a heading pasted out of a slide, a form field someone filled in with caps lock on. Reading capitals is slower and it looks like shouting, so the whole block has to come down a level before it can be used.
The other case is consistency across a set. A list of headings written by four people, a column of names, a set of category labels — each individually fine, collectively inconsistent. Converting the whole set to one mode and then correcting the handful of proper nouns is faster than editing each line, and it makes the exceptions obvious because they are the only things left to fix.
Text lifted out of a PDF often arrives in whatever case the designer chose — all-caps headings, small-caps labels — rather than the case you need. PDF to Word is how you get that text into an editable document in the first place, and this page fixes the capitalisation afterwards.
How it compares
A word processor has a change-case command and does the same job on a document you already have open. This is faster for text that is not in a document — a paste from a chat, a spreadsheet cell, a CMS field — and unlike the online converters that post the text to a server, nothing here leaves the tab, which matters for internal copy and anything under embargo. For genuine style-guide title case across many headlines, an editor with a house-style dictionary will beat both.