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Text Case Converter Online: UPPER, lower & camelCase

Text case converter online: switch between upper, lower, title, sentence, and camelCase in one click. Works with any text.

Updated 2026-08-26

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Features

  • Convert text to UPPERCASE, lowercase, Title Case, and Sentence case instantly
  • Toggle case: swap uppercase and lowercase characters
  • camelCase conversion for JavaScript/TypeScript variable names
  • PascalCase conversion for class and component names
  • snake_case conversion for Python and database column names
  • kebab-case conversion for URL slugs and CSS class names
  • Preserve or strip non-alphabetic characters in code-style conversions
  • Click a case button to transform text; results update immediately
  • One-click copy output to clipboard
  • Works offline after first load

How to Use

  1. 1Type or paste your text into the input area.
  2. 2Click any case conversion button (UPPERCASE, lowercase, Title Case, etc.) to see the result.
  3. 3Review the transformed text in the output area below.
  4. 4Click the copy button to copy the result to your clipboard.
  5. 5Convert a variable name between code conventions; paste 'my_variable_name' and click camelCase to get 'myVariableName' for JavaScript.
  6. 6Rename CSS classes by pasting 'my-css-class' and clicking PascalCase to get 'MyCssClass' for React component names.
  7. 7Fix inconsistent casing in imported data; paste a column header like 'FIRST_NAME' and convert to 'First Name' (Title Case) for cleaner display.
  8. 8Normalize user-generated content by converting everything to sentence case; only the first letter of the sentence is capitalized.
  9. 9Toggle the case of accidentally CAPS-LOCKED text; paste 'i AM sORRY' and click Toggle Case to fix it to 'I Am Sorry'.
  10. 10Use snake_case output to prepare database column names or Python variable names from natural language phrases.

Frequently Asked Questions

What's the difference between camelCase and PascalCase?

camelCase starts with a lowercase letter and capitalizes each subsequent word (e.g., 'helloWorld'). PascalCase capitalizes every word including the first (e.g., 'HelloWorld'). Use camelCase for variables/functions in JavaScript, and PascalCase for class/component names.

What is Title Case?

Title Case capitalizes the first letter of every major word (nouns, verbs, adjectives, adverbs) while keeping minor words (articles, prepositions, conjunctions) lowercase. The first and last word are always capitalized regardless.

Is there a keyboard shortcut to change text case?

Browsers have no built-in case shortcut, and only a few apps do: Microsoft Word cycles case with Shift+F3 (English words only), and some text editors bind a key in their settings. On the web, the fastest path is to select your text, paste it here, and click the case button; it converts the whole selection at once.

Does the tool convert Chinese RMB amounts to uppercase (壹贰叁)?

No. This tool converts letter casing (English and other alphabetic scripts) only. Converting 1234.56 into 壹仟贰佰叁拾肆元伍角陆分 is a number-to-Chinese-numeral job, not a case job; use a dedicated RMB amount converter for that.

Does the tool handle non-English text?

Yes. The tool supports all Unicode characters including accented Latin (é, ü, ñ), Chinese, Japanese, Korean, Arabic, and more. Uppercase/lowercase conversions work for letters with case systems. CJK and other caseless characters are preserved unchanged. Code-style conversions (camelCase, snake_case, etc.) keep non-ASCII words intact.

What's the difference between Title Case and Sentence case?

Title Case capitalizes every major word: 'The Quick Brown Fox Jumps Over the Lazy Dog'. Sentence case capitalizes only the first word and proper nouns: 'The quick brown fox jumps over the lazy dog'. Title Case is used for headlines and titles; Sentence case for normal prose.

When should I use kebab-case vs snake_case in programming?

kebab-case (my-component) is used in: URL slugs, CSS class names, HTML data attributes, Vue.js component names, and command-line flags. snake_case (my_component) is used in: Python variable/function names, Ruby symbols, database column names, and JSON field names in some APIs.

How do I convert a database column name to a JavaScript variable?

Database columns often use snake_case (user_first_name). To convert to JavaScript camelCase, paste 'user_first_name' and click camelCase to get 'userFirstName'. For class names, use PascalCase to get 'UserFirstName'. The tool makes this conversion instant.

Can I convert the case of a whole document or just single words?

The tool works with any amount of text, from a single word to an entire paragraph or document. All case operations apply consistently across the full input. Try converting a multi-sentence paragraph to UPPERCASE or lowercase with one click.

What happens to numbers and special characters during case conversion?

Numbers and special characters are preserved as-is. In code-style conversions (camelCase, snake_case), non-alphabetic characters act as word separators and are removed. For example, 'hello-world-123' becomes 'helloWorld123' in camelCase. For UPPERCASE/lowercase, all characters except letters are unchanged.

Why does my Title Case conversion not capitalize small words?

Title Case rules typically leave articles (a, an, the), coordinating conjunctions (and, but, or), and short prepositions (in, on, at, for) lowercase unless they're the first or last word. The tool follows standard title case conventions used in AP Style and Chicago Manual of Style.

Why does my text case converter online change the case of brand names like iPhone or McDonald's?

Case conversion is mechanical: the tool has no dictionary of proper nouns, so UPPERCASE turns iPhone into IPHONE and Title Case turns it into Iphone, and it cannot guess that McDonald's keeps its internal capitals. Convert only the words you need, or fix brand casing manually afterwards. Note that code-style conversions (camelCase, snake_case) also split on apostrophes, so McDonald's becomes mcdonaldS unless you remove the apostrophe first.

Why does my text get longer when I convert it to uppercase ('ß' became 'SS')?

Unicode case mapping is not always 1:1. German ß has no uppercase form of its own, so it maps to 'SS' (also in Title Case); Turkish İ maps to i with a combining dot, so lengths can shift; ligatures like fi behave similarly. This tool follows the standard Unicode case mappings, the same ones your programming language's toUpperCase() uses. It is correct behavior; if your data depends on character counts (database column lengths, fixed-width formats), do the case conversion before measuring.