Case Converter

Switch text between any case in one click.

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Which case should you use?

UPPERCASE / lowercase — for emphasis, or to normalise messy text.
Title Case — headlines and titles: capitalise each word.
Sentence case — normal prose: capitalise the first letter of each sentence.
camelCase and snake_case and kebab-case — naming variables, files and URLs in code.

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The cases, and where each belongs

Case	Example	Used for
Sentence case	The quick brown fox	Body text, most modern UI headings
Title Case	The Quick Brown Fox	Headlines, book and article titles
UPPERCASE	THE QUICK BROWN FOX	Short labels only; slows reading in bulk
lowercase	the quick brown fox	Tags, slugs, some brand styling
camelCase	theQuickBrownFox	JavaScript and Java variables
PascalCase	TheQuickBrownFox	Class and component names
snake_case	the_quick_brown_fox	Python, Ruby, SQL columns
kebab-case	the-quick-brown-fox	URLs, CSS classes, file names
CONSTANT_CASE	THE_QUICK_BROWN_FOX	Constants and environment variables

Title case is not just capitalising everything

Every style guide agrees on the principle — capitalise the important words — and disagrees on the details. The common core: capitalise the first and last word, all nouns, pronouns, verbs, adjectives and adverbs; leave articles (a, an, the), coordinating conjunctions (and, but, or) and short prepositions in lower case. AP style lowercases prepositions of three letters or fewer; Chicago lowercases prepositions of any length unless they are used adverbially. Both capitalise the word after a colon.

AP: A Guide to the Art of Letting Go

Chicago: A Guide to the Art of Letting Go

Both: What to Look For — but never “What To Look For”

Why programming has so many conventions

Identifiers cannot contain spaces, so each language community settled on a way to mark word boundaries. The choice is arbitrary, but consistency within a codebase is not: mixed conventions break auto-complete habits, make search unreliable and produce bugs in languages where userID and userId are different names. Follow the host language’s convention rather than your personal preference.

Accessibility note on all caps

Long runs of capitals remove the ascenders and descenders that let readers recognise word shapes, measurably slowing reading and hitting dyslexic readers hardest. Screen readers may also spell out longer capitalised strings letter by letter. If you want the visual weight of capitals, write in sentence case and apply text-transform: uppercase in CSS — the underlying text stays readable to assistive technology.

Case converter FAQ

What is Title Case?

A style in which the first, last and all significant words are capitalised while articles, coordinating conjunctions and short prepositions stay lower case. It is standard for headlines and titles.

What is camelCase and snake_case?

camelCase joins words with no spaces and capitalises each word after the first, as in userName. snake_case separates words with underscores, as in user_name. They are naming conventions for programming identifiers.

Which case should I use for URLs?

kebab-case, with words separated by hyphens and all lower case. Hyphens are read as word separators by search engines and lower case avoids case-sensitivity problems on some servers.

Is all caps harder to read?

Yes, in longer runs. Capitals remove the ascenders and descenders readers use to recognise word shapes, which measurably slows reading. Reserve capitals for short labels.

Do AP and Chicago style disagree on title case?

Slightly. AP lowercases prepositions of three letters or fewer, while Chicago lowercases prepositions of any length unless they are used adverbially. Both capitalise the first and last word.

Is my text sent anywhere when I convert it?

No. Conversion happens entirely in your browser and nothing you paste leaves your device.

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