Everything you need to know about case conversion — Title Case rules, programming conventions, workflow tips, and privacy answered clearly.
A case converter is a free online tool that instantly changes how text is capitalized — for example, transforming "hello world" into HELLO WORLD, Hello World, or hello_world.
It saves you from retyping text when you need a different format for a headline, URL slug, programming variable, or social media caption. This converter supports 16 formats including UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case.
Title Case capitalizes the main words in a phrase and skips small words; Sentence case capitalizes only the first letter of each sentence.
| Format | Example | When to use |
|---|---|---|
| Title Case | How to Bake a Cake | Headlines, blog titles, book titles |
| Sentence case | How to bake a cake | Body text, subheadings, modern UI |
Use Title Case for article titles. Use Sentence case for body paragraphs and most user interface copy — it's the modern standard for web apps, Google products, and Apple interfaces.
Capitalized Case capitalizes the first letter of every word, including small ones. Title Case follows AP-style rules and skips short words like a, an, the, of, for, to, and.
Compare: "How To Bake A Cake" (Capitalized Case — every word capitalized) vs "How to Bake a Cake" (Title Case — proper headline style). Title Case looks more professional for modern web content; Capitalized Case is still common in formal documents and some legal writing.
AP-style (Associated Press) is the standard headline format used by most news outlets and blogs. It capitalizes all words except articles (a, an, the), short prepositions (at, by, for, in, of, on, to), and conjunctions (and, but, or, nor) — unless they're the first or last word of the title.
Our Title Case button uses AP style by default, which is also fully compatible with MLA, APA, and Chicago headline formats for most titles. So if you searched for an MLA title case converter, this is exactly the tool you need.
Both formats join words without spaces. camelCase keeps the first letter lowercase; PascalCase capitalizes every word including the first.
| Format | Example | Used for |
|---|---|---|
| camelCase | myVariableName | Variables, functions in JavaScript, Java |
| PascalCase | MyVariableName | Classes, React components, C# types |
Rule of thumb: use camelCase for variables and functions, PascalCase for classes and components.
Use snake_case inside code; use kebab-case in URLs and CSS.
| Format | Example | Standard in |
|---|---|---|
| snake_case | user_profile | Python, Ruby, SQL column names |
| kebab-case | user-profile | URLs, CSS classes, HTML attributes |
Hyphens are more SEO-friendly than underscores in URLs — Google treats hyphens as word separators but underscores as word joiners. Never use kebab-case inside a programming variable; most languages will read the hyphen as a subtraction operator and throw a syntax error.
CONSTANT_CASE (also called SCREAMING_SNAKE_CASE) marks values that never change during program execution. Typical uses: environment variables (DATABASE_URL), configuration keys (MAX_RETRY_COUNT), and API tokens.
The all-caps format is a convention across almost every programming language — it signals to other developers "this value is fixed, don't mutate it."
Both apps have built-in case tools, but they're limited to basic options.
In Microsoft Word: select your text, then click Home → Change Case (the Aa icon), or press Shift + F3 to cycle through UPPER, lower, and Sentence case.
In Google Docs: select text, then go to Format → Text → Capitalization.
For anything beyond UPPER/lower/Title — such as snake_case, kebab-case, true AP-style Title Case, or bulk text cleanup — paste into this converter instead. It's faster and supports 16 formats.
Excel and Google Sheets offer three built-in formulas: =UPPER(A1), =LOWER(A1), and =PROPER(A1).
However, PROPER capitalizes every word including small ones like "of" and "the" — there's no built-in for true Title Case, Sentence case, or any programming case. For one-off conversions, paste the cell value into this tool, convert, and paste it back. It's usually faster than writing a custom formula.
Yes — there's no hard word limit. You can paste several thousand words at once and convert everything in a single click.
The live stats panel shows words, characters, sentences, paragraphs, and estimated reading time, so you can verify your text was pasted correctly before converting. Line breaks and paragraph spacing are preserved through every conversion except "Remove line breaks."
No — all conversion happens directly in your browser using JavaScript. Your text never leaves your device, isn't sent to our servers, isn't logged, and isn't stored anywhere.
You can even use the tool offline once the page has loaded. This makes it safe for confidential drafts, passwords inside config strings, client content, and private writing.
Yes — all Latin-based accented characters are fully supported and preserved through every conversion. This includes é, ñ, ü, ç, ø, ß, å, and all other European diacritics.
Uppercase and lowercase conversions handle them correctly: ÜBER ↔ über, Français ↔ FRANÇAIS, Niño ↔ NIÑO.
It works with any alphabet that has an uppercase/lowercase distinction — including Cyrillic (Russian, Ukrainian, Bulgarian), Greek, and most European scripts.
Scripts that don't use case — Arabic, Hebrew, Chinese, Japanese, Korean, Thai — will pass through unchanged, since there's no capitalization concept to convert. Programming cases (snake_case, camelCase) still work regardless of script.
Yes — the interface is fully responsive and optimized for mobile. Toolbar icons collapse to save space, format buttons reflow to fit your screen, and the paste and copy actions use your phone's native clipboard.
It's often faster than using a mobile text editor's built-in case tools, especially for programming formats like camelCase or snake_case that most mobile apps don't support.
That's correct AP-style behavior, not a bug. Professional headlines don't capitalize articles ("a", "an", "the"), short prepositions ("of", "in", "on"), or conjunctions ("and", "but") — unless they're the first or last word.
If you want every single word capitalized including small ones, use Capitalized Case instead of Title Case.
Yes — tap the Undo button or press Ctrl + Z (Cmd + Z on Mac).
The tool keeps a history of up to 30 previous states, so you can step back through multiple accidental conversions without losing your original text.
Both spellings are correct. Converter is the standard US and UK spelling; convertor is common in Indian English and some British technical writing.
Both refer to the same thing — a tool that changes text capitalization — and this tool works the same regardless of which spelling brought you here.