Case Converter: what it does
Paste your text, pick a case and copy the result. The converter handles the cases people need every day: Sentence case for text typed with Caps Lock on, lower case, UPPER CASE for headings and buttons, Capitalized Case and proper Title Case for headlines, where short words such as “and”, “of” and “the” stay lower case. For code and spreadsheets it also makes camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE, line by line, so a whole column of names converts in one go. Acronyms and brand names such as NASA, iPhone and web addresses are kept as they are unless you untick the option.
How to use it
- Type or paste your text into the box.
- Pick a case: Sentence, Title, lower, UPPER, Capitalized, or a code case such as camelCase.
- The result updates as you type. Untick “Keep acronyms” if you want every word changed.
- Click “Copy”, or download the result as a .txt file.
Tips
- Typed a paragraph with Caps Lock on? Choose Sentence case: it lower-cases everything, then capitalises the first letter of each sentence and the word “I”.
- Use Title Case for headlines and Capitalized Case only where every word must start with a capital, such as names in a list.
- Writing a social post? All-caps reads as shouting. Keep UPPER CASE for one or two words you really want to stand out.
- To make URL slugs, choose kebab-case: “My Best Recipes 2026” becomes my-best-recipes-2026.
- Code cases work line by line. Paste a column from a spreadsheet to convert every row at once.
- Sentence case cannot know which words are names. Check proper nouns (people, places, brands) after converting.
Frequently asked questions
What is the difference between Title Case and Capitalized Case?
Capitalized Case starts every word with a capital letter. Title Case follows style-guide rules: short articles, conjunctions and prepositions (a, an, the, and, but, or, of, in, on, to…) stay lower case unless they are the first or last word or follow a colon.
What is sentence case?
Only the first letter of each sentence is a capital, plus the word “I”. It is the easiest case to read and the one most style guides recommend for subheadings, buttons and social posts.
What are camelCase, snake_case and kebab-case?
Ways of writing several words without spaces, used in code and file names. camelCase: myFileName. PascalCase: MyFileName. snake_case: my_file_name. kebab-case: my-file-name (used in URLs). CONSTANT_CASE: MY_FILE_NAME.
Does it work with accented letters and other languages?
Yes. Upper and lower case use your browser’s Unicode rules, so é, ß, Ä and Cyrillic or Greek letters convert correctly. Scripts without capital letters, such as Arabic and Urdu, stay as they are.
Is my text uploaded?
No. The conversion runs in your browser, so nothing is sent to our servers. Your last text is kept in this browser only so it survives a refresh.