Text Case Converter

The six conversions side by side

The second column shows the key difference between the two capitalising modes: Title Case and Sentence case lowercase everything first, so brand names and acronyms lose their capitals, while Capitalize Each Word only touches the first letter of each word and leaves the rest exactly as typed.

Which words Title Case keeps lowercase

Title Case keeps 17 short words in lowercase unless they come first: a, an, and, as, at, but, by, for, in, of, on, or, the, to, with, nor and via. Everything else gets a capital, including each part of a hyphenated word, so 'well-known state-of-the-art tools' becomes 'Well-Known State-of-the-Art Tools'. Words are only exempt when they appear in that list; verbs like 'is' and 'be' are capitalised, which matches most style guides.

A word containing an apostrophe is treated as one word, so 'don't stop me now' becomes 'Don't Stop Me Now'.

How Sentence case finds the sentences

After lowercasing the whole text, Sentence case capitalises the first letter of the text and any letter that follows a full stop, question mark or exclamation mark plus whitespace. 'hello. i went to paris. did you?' becomes 'Hello. I went to paris. Did you?'. Note two consequences: the pronoun 'i' is only capitalised when it starts a sentence, and a new line that does not follow closing punctuation stays lowercase, because a line break alone is not treated as a sentence boundary.

Quirks to know before you click

• Capitalize Each Word treats an apostrophe as part of the word, so 'don't' becomes 'Don't' and 'O'Neil's' becomes 'O'Neil's'. A hyphen does start a new word: 'well-known' becomes 'Well-Known', which is what most style guides want in a heading.
• All six modes work on letters from any alphabet. 'école normale' becomes 'École Normale' in Title Case, 'über alles' becomes 'Über Alles', and Sentence case capitalises an accented first letter the same way. Scripts without upper and lower case, such as Arabic or Chinese, pass through unchanged.
• aLtErNaTiNg counts every character including spaces and punctuation, starting lowercase at the first character. Because spaces take a turn, the pattern can shift between words: 'hello world' gives 'hElLo wOrLd'.
• Each button replaces the text in the box, and there is no undo button. Keep the original somewhere else if you may need it again, since Title Case cannot restore capitals that lowercase removed.

Typical jobs for each mode