Seven conversions at once, including Title Case done the way style guides actually define it. Everything happens in your browser — nothing is uploaded, nothing is stored, and there is no limit on how much you paste in.
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UPPERCASE
Everything capital.
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lowercase
Everything small.
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Title Case
Properly — small words stay small.
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Sentence case
First letter of each sentence.
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Capitalise Every Word
Every word, including the small ones.
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aLtErNaTiNg
For the obvious reason.
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iNVERSE
Swaps whatever you have.
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Because most converters capitalise every word, and that is not title case — it is capitalise-every-word, which is a different thing and has its own button above.
In every style guide anybody actually follows, small words stay lowercase inside a title: articles (a, an, the), coordinating conjunctions (and, but, or, nor) and short prepositions (of, in, to, for, on, at, by).
The Lord of the Rings — not The Lord Of The Rings.
A Tale of Two Cities — not A Tale Of Two Cities.
What to Look for in a Word Counter — to, for, in and a all stay down.
The exception is position. The first and last word of a title are always capitalised whatever they are — which is why A Tale of Two Cities starts with a capital A, and why a title ending in On would capitalise it.
Length, mostly. AP style capitalises any word of four letters or more, so it writes Over and With and From. Chicago keeps prepositions lowercase however long they are, so it writes over, with, from — and even throughout.
This converter follows the ground they share: articles, coordinating conjunctions and short prepositions down, everything else up. If your house style is strictly one or the other, the handful of four-letter prepositions are the only words you will need to adjust by hand.
Worth knowing that sentence case has been quietly winning for a decade. Most software, most product design and an increasing number of publications use it for headings, because it reads faster and never raises the question above at all.
The caps-lock accident
A paragraph typed with caps lock on. Lowercase it, then sentence case it, and it is back in two clicks rather than retyped.
Headings from a draft
Writers type headings in whatever case is convenient. Converting them all at the end is faster than being consistent while drafting — and being consistent while drafting is a poor use of attention anyway.
Data pasted from somewhere else
Names, addresses and product lists arrive SHOUTING from older systems. Capitalise Every Word handles those better than Title Case, because a name is not a title.
Spreadsheet cleanup
Anything exported from a database tends to come out in one case. Paste a column, convert, paste it back.
If you are counting rather than converting, the word counter is the other half of this site — also free, also entirely in your browser. And more tools has the rest.
Everything here runs in your browser — nothing you type is uploaded anywhere.
Word Counter
Words, characters, sentences and reading time, live.
Word Cloud
Which words you actually lean on.
Readability
Flesch-Kincaid and three others at once.
Word Unscrambler
Every valid word in a jumble of letters.
Reading Time
How long a piece takes to read.
Citation Generator
APA, MLA, Chicago and Harvard.
Essay Counter
Word goals and progress for longer drafts.
X / Twitter Counter
Weighted counting and the real limits.
Instagram Counter
Where your caption gets truncated.