Case Converter
Convert pasted text to UPPERCASE, lowercase, Sentence case, Title Case, or Capitalize Each Word — and settle every word where AP and Chicago disagree.
Case Converter
Convert pasted text to UPPERCASE, lowercase, Sentence case, Title Case, or Capitalize Each Word — and settle every word where AP and Chicago disagree.
About case conversion
Six direct text modes
The converter applies one selected mode to the whole pasted text. UPPERCASE and lowercase use the browser string casing rules. Sentence case lowercases the text and capitalizes the first letter of each line and sentence. Title Case treats each line as its own title: the first and last word are always capitalized, so is the word after a colon, dash, question mark, or exclamation mark, and articles, coordinating conjunctions, the infinitive "to" and prepositions stay lowercase. Capitalize Each Word capitalizes the first letter after a space or hyphen and leaves letters after an apostrophe lowercase, so "it's" stays "It's". Random case changes only Latin letters while leaving numbers and punctuation unchanged.
Not an identifier formatter
Use this page for quick copy cleanup, heading checks, labels, or throwaway test text. It does not split words by separators, infer programming naming conventions, or generate camel case and snake case variants, so code identifiers still need manual review.
FAQ
Common questions and answers about this topic.
What case styles are supported?
Six modes: UPPERCASE, lowercase, Sentence case, Title Case, Capitalize Each Word, and RaNdOm CaSe. Title Case keeps short words like "a" and "of" lowercase; Capitalize Each Word capitalizes every word instead, including those short ones.
When should I use different case styles?
UPPERCASE is useful for shouting labels or constants, lowercase for normalizing pasted text, Sentence case for cleaning up subject lines or notes typed in all caps, Title Case for article, documentation, and slide titles that follow a style guide, Capitalize Each Word for short headings and labels, and random case for visual testing or examples. This page does not create camelCase or snake_case identifiers.
Which title-case rules does it follow, and what can it get wrong?
It follows the rules AP and Chicago agree on: the first and last word of each line are capitalized, so is the word after a colon, dash, question mark, or exclamation mark, while articles, coordinating conjunctions, the infinitive "to" and prepositions of three letters or fewer stay lowercase. The two guides disagree on prepositions of four letters or more (AP capitalizes them, Chicago does not); the output follows Chicago and those words appear as buttons above the result, so you can switch any of them to AP with one click. Known limits: it cannot recognize proper nouns or acronyms, so iPhone and NASA get rewritten; words that can be either a preposition or an adverb (the "off" in "Turn Off the Light") are always treated as prepositions; and only English is supported.
What does Sentence case change, and what can it get wrong?
It lowercases everything, then capitalizes the first letter of each line and of each sentence after a period, question mark, or exclamation mark, and keeps the English pronoun "I" capitalized. It cannot recognize proper nouns or acronyms, so names like Google or NASA become lowercase and need to be fixed by hand. Only "i.e." and "e.g." are skipped as abbreviations; others such as "etc." or "Dr." are treated as the end of a sentence.
Is my data sent to any server?
No, case conversion is performed entirely in your browser. Your text is transformed locally with JavaScript and never sent to any server.