What Is a Case Converter?
A case converter changes how letters are capitalized in a string. Use it as an upper case lower case converter, a title case converter, or a text case converter for programming styles such as camelCase, PascalCase, snake_case, and kebab-case.
This free online case converter runs in your browser. Paste text, pick a format—including AP Stylebook and Chicago Manual of Style title casing—and copy the result instantly.
Title Case: AP Stylebook vs Chicago Manual of Style
Title case capitalizes major words. Minor words and articles (such as a, the, and, of) often stay lowercase unless they are the first or last word. AP title case and Chicago title case follow that idea with slightly different lists of short words.
Use AP when matching newsroom or AP Stylebook headlines. Use Chicago when following Chicago Manual of Style book and academic titles.
Programming Cases: camelCase, snake_case, and More
- camelCase — first word lower, later words capitalized
- PascalCase — every word capitalized
- snake_case — lowercase words joined with underscores
- kebab-case — lowercase words joined with hyphens
- CONSTANT_CASE — uppercase snake case for constants
Sentence case capitalizes the start of each sentence. Alternating and inverse case are handy for demos and stylistic experiments.
Acronyms, Hyphens, and Mixed-Case Words
Title and sentence case keep common acronyms such as HTML, CSS, and API in uppercase. Hyphenated words like e-commerce become E-Commerce. Mixed identifiers such as XMLHttpRequest are split on camelCase and acronym boundaries before camelCase, PascalCase, snake_case, or kebab-case conversion. Extra spaces are normalized in editorial formats.
Locale-Aware Casing and Turkish Dotted i
JavaScript's toUpperCase() and Excel-style UPPER() / PROPER() behave differently across locales. Turkish dotted and dotless i are a common pitfall. This tool defaults to en-US casing so English editorial and developer conversions stay predictable.
Case Converter FAQs
What is a case converter?
A case converter changes the capitalization of text—uppercase, lowercase, sentence case, title case, camelCase, snake_case, and related formats—without rewriting the words themselves.
What is the difference between AP and Chicago title case?
Both capitalize major words. AP Stylebook keeps short conjunctions, articles, and many short prepositions lowercase unless they are first or last. Chicago Manual of Style uses a similar rule with a slightly broader set of short words that stay lowercase.
What is camelCase vs PascalCase?
camelCase starts with a lowercase letter (myVariableName). PascalCase capitalizes every word (MyVariableName). Both remove spaces between words.
What is snake_case vs kebab-case?
snake_case joins lowercase words with underscores (my_variable_name). kebab-case uses hyphens (my-variable-name), common in URLs and CSS.
How are acronyms and hyphenated words handled?
Title and sentence case keep common acronyms (HTML, CSS, API, and similar) uppercase. Hyphenated words such as e-commerce become E-Commerce. Programming formats split mixed identifiers like XMLHttpRequest on case changes, then join as camelCase, PascalCase, snake_case, or kebab-case. Extra spaces are collapsed in editorial formats.
Does this handle Turkish dotted i?
This tool uses en-US locale casing for predictable developer and English editorial defaults. Locale-aware Turkish İ/i rules are not applied; use a locale-specific library when you need them.
Is this a free online case converter?
Yes. Conversion runs in your browser—nothing is uploaded to LiveTechHacks. Use it as an upper case lower case converter, title case converter, or programming-case helper.