Online Case Converter

Yes. This tool follows standard title case conventions and keeps minor words - articles (a, an, the), coordinating conjunctions (and, but, or, nor, for, so, yet), and short prepositions (at, by, in, of, on, to, up) - in lowercase, unless they appear as the very first word of the title.

For camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and dot.case, punctuation and special symbols are stripped and treated as word boundaries. Words are then joined with the appropriate separator or capitalisation pattern. Numbers are preserved in place within words.

Yes - the tool handles multi-line input for all text-style formats (uppercase, lowercase, sentence case, title case, alternating, inverse). Developer-style formats like camelCase and snake_case treat all input as a single logical string, which is the expected behaviour when generating identifier names.

There is no imposed character limit. Since everything runs locally in your browser, the only practical constraint is your device's available memory - which comfortably handles documents of tens of thousands of words without any slowdown.

Alternating case cycles through each letter character and alternates between lowercase and uppercase. Non-letter characters - spaces, punctuation, numbers - are left unchanged and do not reset the alternation counter. The pattern always begins with a lowercase letter on the first character.

Both formats join multiple words without spaces and capitalise the first letter of each word - except that camelCase keeps the very first word entirely lowercase (e.g. helloWorld), while PascalCase capitalises the first word too (e.g. HelloWorld). camelCase is the convention in JavaScript for variables and functions; PascalCase is used for class names and React components.

Both formats write all words in lowercase and separate them with a delimiter, but the delimiter differs: snake_case uses an underscore (_), while kebab-case uses a hyphen (-). snake_case is common in Python variable names, database column names, and file names. kebab-case is the standard for CSS class names, HTML attributes, URL slugs, and command-line flags, partly because hyphens are valid in those contexts where underscores might not be.

CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) writes all words in uppercase and separates them with underscores - for example MAX_RETRY_COUNT or API_BASE_URL. It is the universal convention for constants and environment variables across most programming languages, including JavaScript, Python, Java, and C. The all-caps style signals to other developers that the value is fixed and should not be reassigned at runtime.

dot.case joins words with a period separator, writing all characters in lowercase - for example hello.world. It is commonly used in configuration file namespaces (such as app.server.port), logging key hierarchies, package identifiers in some ecosystems, and property access chains. It is less common than snake_case or kebab-case in general programming but standard in specific tooling contexts.

Sentence case capitalises only the first letter of the first word in a sentence, leaving everything else lowercase - exactly as you would write a normal sentence. It is the standard for body text, UI labels, subtitles, and chat messages. Title case capitalises the first letter of every significant word (nouns, verbs, adjectives, adverbs) while leaving minor words lowercase. It is the convention for headlines, book titles, article headings, and navigation menus in most English style guides.

Inverse case (also called toggle case) flips the capitalisation of every letter in the input - uppercase letters become lowercase and lowercase letters become uppercase. For example, Hello World becomes hELLO wORLD. It is primarily used for stylistic or creative purposes such as design mockups, text art, and visual contrast effects rather than any standard writing or coding convention.

Yes. The case converter runs entirely in your browser using JavaScript - no text you enter is ever sent to a server, stored in a database, or logged anywhere. Your content stays completely private, which means you can safely use it with sensitive, confidential, or proprietary material without creating an account or logging in.

kebab-case is the standard convention for CSS class names - for example .button-primary or .nav-link-active. This is because hyphens are valid in CSS identifiers and the format is universally recognised in stylesheets. Some CSS-in-JS frameworks and utility-first libraries like Tailwind also use it. Avoid camelCase or snake_case for class names as they are non-standard and can cause confusion.

kebab-case is the recommended format for URL slugs - for example /blog/how-to-write-clean-code. Search engines read hyphens as word separators, which helps with indexing individual keywords. Underscores are not treated as word separators by all search engines, making snake_case a poorer choice for URLs. Spaces are percent-encoded as %20 and should always be avoided in URLs entirely.