Case Converter
Change uppercase to lowercase and back, fix accidental caps lock, or turn phrases into code identifiers. Pick a language for correct results with Turkish, Azerbaijani and Lithuanian letters.
Runs entirely in your browser. Your text is not uploaded.
The letter that breaks most case converters
English has one letter i. Turkish has two: dotted i/İ and dotless ı/I. Uppercasing “istanbul” with English rules gives ISTANBUL, which a Turkish reader sees as a misspelling. Switch the rules and watch the dots.
Under English rules the round trip loses information: ı becomes I, and I comes back as i. Under Turkish rules each letter keeps its partner. German has its own quirk: ß has no single-letter capital in everyday use, so “straße” uppercases to STRASSE.
How to use the case converter
- Paste your text.
- Click a case button; the result appears below.
- Copy it, download it, or press "Use as input" to chain another conversion.
Which case to use
- Sentence case for body copy, buttons and most UI labels (recommended by the GOV.UK and Microsoft style guides).
- Title Case for headlines in publications that follow AP or Chicago; use the title case converter for style-specific rules.
- camelCase for JavaScript and Java variables, PascalCase for class names, snake_case for Python and SQL, kebab-case for URLs and CSS classes, CONSTANT_CASE for constants.
Questions
How do I change uppercase to lowercase?
Paste the text and click "lowercase". To keep the first letter of each sentence capitalised, click "Sentence case" instead.
Why does the language setting matter?
Turkish and Azerbaijani have a dotted and a dotless i. In Turkish, lowercase i becomes İ and uppercase I becomes ı. Generic converters get this wrong; choose Turkish and ours follows the Unicode locale rules built into your browser.
What is the difference between camelCase, snake_case and kebab-case?
All three join words without spaces for use in code. camelCase capitalises every word after the first (userName), snake_case joins lowercase words with underscores (user_name), and kebab-case uses hyphens (user-name), which is common in URLs and CSS.
Is there a case converter in Microsoft Word?
Word has Change Case (Aa) on the Home tab and the Shift+F3 shortcut, which cycles lowercase, UPPERCASE and Capitalize Each Word. It has no sentence case shortcut for mixed text, no camelCase or snake_case, and follows English rules for the Turkish i.
What does Sentence case do with names?
It lower-cases everything and then capitalises the first letter of each sentence and the pronoun "I". Proper nouns such as "Paris" become lowercase, so check names afterwards.