Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase and more.
How to use the Case Converter
- Type or paste your text.
- Copy any of the converted versions with one click.
About the Case Converter
Seven conversions, all computed live. UPPERCASE and lowercase are exactly what they sound like. Title Case here applies one simple rule — capitalise the first letter of every word — which is deliberately not what a style guide does. AP and Chicago both keep short words such as “of”, “the” and “and” lowercase inside a title, and they disagree with each other about where the cutoff falls. Treat this output as a starting point for a headline rather than a finished one.
Apostrophes are treated as part of the word, so “don’t” comes out as “Don’t” rather than “Don’T”. The honest trade-off is at the other end: a name like “o’brien” becomes “O’brien”, not “O’Brien”, because nothing in the text tells the tool which apostrophes start a new sound and which sit inside a contraction. Contractions are far more common, so that is the case the rule serves. Sentence case capitalises the first letter and anything following a full stop, exclamation mark or question mark. The developer formats — camelCase, snake_case and kebab-case — first split your text on anything that is not a letter or a digit, which means punctuation and accented characters are dropped rather than converted: “café au lait” becomes cafAuLait, not caféAuLait.
Two things are worth knowing generally. Uppercasing destroys information: once “iOS” becomes “IOS”, nothing can reliably put the original back, so convert a copy rather than your only version. And case is language-specific — Turkish has a dotless ı whose capital is I and a dotted i whose capital is İ, so a converter using English rules mangles Turkish text. This tool applies English rules. Everything runs in your browser. For URL-ready output, see the slug generator; to count what you have written, the word counter.
Frequently asked questions
Does Title Case follow AP or Chicago style?
Neither. It capitalises the first letter of every word, including short ones like "of" and "the" that both style guides would leave lowercase. For a headline that has to follow a house style, use this as a first pass and lowercase the short words yourself.
How are apostrophes handled in Title Case?
The apostrophe is treated as part of the word, so "don't" becomes "Don't" and not "Don'T". The cost is that Irish-style names are not capitalised after the apostrophe: "o'brien" gives "O'brien" rather than "O'Brien", which you would need to fix by hand.
Can I undo an uppercase conversion?
Not reliably. Uppercasing throws away the original capitalisation, so converting back to lowercase gives you plain lowercase, not the mixed case you started with. Brand names and acronyms like iOS or NASA cannot be recovered. Always keep the original.
What is the difference between snake_case and kebab-case?
Both lowercase everything and join words with a separator: snake_case uses underscores, kebab-case uses hyphens. Snake case is common in Python and database columns; kebab case is common in CSS class names and URLs.
What happens to accented characters in camelCase?
They are removed. The developer formats keep only letters A-Z and digits, so "café" becomes "caf". The UPPERCASE, lowercase, Title Case and Sentence case outputs keep accents intact.