Case Converter
Paste your text, pick a case and copy the result. The case converter changes uppercase to lowercase and back, applies proper Title Case rules and builds code-style names – with full Unicode support for accents and other alphabets.
How it is calculated
All conversions run locally in your browser using the Unicode case rules, so accented letters and other alphabets work too – “élève” becomes “ÉLÈVE”, German “straße” becomes “STRASSE”.
Which case to use
- UPPERCASE / lowercase: the whole text in one case.
- Title Case: follows the APA style rule. Major words are capitalized; minor words of three letters or fewer – articles (a, an, the), short conjunctions (and, but, or, nor, for, so, yet, as, if) and short prepositions (at, by, in, of, off, on, per, to, up, via) – stay lowercase. The first and last word and the first word after a colon are always capitalized, and both parts of hyphenated words are capitalized (“Self-Report”). Acronyms like NASA and mixed-case words like iPhone are left alone. Other style guides (Chicago, AP) differ slightly – check the one your publisher uses.
- Sentence case: only the first word of each sentence (and proper nouns, which you may need to fix by hand) starts with a capital. Abbreviations such as “e.g.” or “Mr.” do not start a new sentence.
- Capitalize Each Word: every word starts with a capital, with no exceptions for minor words.
- camelCase, PascalCase, snake_case, kebab-case: naming styles for variables, file names and URLs. Words are split at spaces, punctuation and inner capitals (“parseHTTPResponse” → “parse_http_response”); each line is converted separately.
- iNVERSE cASE: swaps upper and lower case – handy after typing with Caps Lock on.
Your text is never uploaded or stored and is not added to the page address.
Frequently asked questions
How do I change uppercase to lowercase?
Paste the text and choose “lowercase”. The result appears instantly with a copy button. In Word you can also press Shift+F3; in Excel and Google Sheets use =LOWER().
Which words are not capitalized in title case?
In APA style: articles (a, an, the), and conjunctions and prepositions of three letters or fewer (and, but, or, for, of, in, on, to, by …) – unless they are the first or last word or follow a colon. Words of four letters or more, such as “with” or “from”, are capitalized.
What is the difference between title case and sentence case?
Title case capitalizes all major words (“The Return of the King”); sentence case capitalizes only the first word and proper nouns (“The return of the king”). APA uses sentence case for article titles in reference lists.
What is the difference between camelCase and PascalCase?
camelCase starts with a lowercase letter (myValue), PascalCase with an uppercase letter (MyValue). snake_case joins words with underscores (my_value), kebab-case with hyphens (my-value).
Sources and legal basis
- APA Style – Title case capitalization (minor words of three letters or fewer)
- APA Style – Sentence case capitalization
- Unicode Character Database – SpecialCasing.txt (ß → SS)
- MDN Web Docs – String.prototype.toLocaleUpperCase()
As of:
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