Free online tool
Case Converter
Paste any text and convert it to the case format you need — instantly.
Why change text case?
Different contexts call for different capitalization. Headlines often use Title Case, code identifiers use camelCase or snake_case, book titles sometimes use ALL CAPS for emphasis, and body copy always uses Sentence case. Retyping text just to change its case wastes time and introduces typos.
How this converter works
Paste your text, pick the case you want, and the tool rewrites it in place. You can chain conversions — for example, convert to lowercase first and then to Title Case for a consistent result. Nothing you type leaves your browser.
Case types explained
UPPERCASE turns every letter capital. lowercase does the opposite. Title Case capitalizes the first letter of each word. Sentence case only capitalizes the first letter of each sentence. camelCase removes spaces and capitalizes each word after the first — useful when creating variable names.
+Does the tool preserve line breaks?
Yes. Only the capitalization is changed; whitespace and paragraphs are untouched (except in camelCase, which removes spaces by design).
+Can I convert emoji or accented characters?
Yes. The tool uses standard JavaScript case conversion, which handles most Unicode characters correctly.
Making capitalization consistent without retyping anything
Title Case has real rules that most people apply inconsistently by hand: articles (a, an, the), coordinating conjunctions (and, but, or, nor), and short prepositions (of, in, on, to) stay lowercase unless they open or close the title, while everything else gets capitalized. 'The Lord of the Rings' is correct; 'The Lord Of The Rings' is not, even though plenty of headline generators get it wrong.
Different style guides disagree on the exact word list too — AP style, Chicago style, and APA style each treat certain short words differently, which is why a single automated tool can't claim to be universally 'correct' but can at least apply one consistent rule set across an entire document instead of a writer's shifting mood from paragraph to paragraph.
Sentence case is not just lowercase-then-capitalize
A proper sentence-case converter has to treat every sentence boundary separately and re-capitalize proper nouns like brand names or 'I' where they would naturally appear, which is why running raw lowercase text through a basic capitalize-first-letter script often produces awkward mid-paragraph errors that this tool avoids by working sentence by sentence.
Quoted dialogue adds another wrinkle: a sentence that starts mid-quote, like he said, 'this changes everything,' still needs its opening word capitalized inside the quotation marks even though it isn't the start of the outer sentence — a detail that trips up simple regex-based converters.
Common editing scenarios
Pasting in text that was typed with caps lock stuck on is the fastest route to a usable draft: run it through lower case first, then apply sentence case rather than title case, since title case will capitalize every word including 'the' and 'and'.
Converting a list of product names or headers to UPPERCASE for a spec sheet or CSV import is one of the few places all-caps is genuinely the right call rather than a style crime.
Alternating case, sometimes called 'sarcasm case' or mock-Spongebob case, shows up constantly in memes and social captions — flipping the case of every other letter by hand is tedious and error-prone the moment you make a single mistake and have to restart counting from the beginning of the string.
Where case consistency actually matters for SEO and branding
Page titles, H1 headings, and navigation menu labels that mix title case and sentence case across a site read as sloppy to a returning visitor even if no single page looks wrong in isolation; running a whole content calendar's worth of headlines through the same converter keeps a brand voice guide enforceable rather than aspirational.
URL slugs and file names are case-sensitive on many servers, so a title-cased heading should never be copied directly into a slug field — converting to lowercase first and replacing spaces with hyphens avoids duplicate-content issues caused by a server treating '/About-Us' and '/about-us' as two different pages.
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