Case Converter
Change prose or identifiers between nine useful letter-case styles.
Enter text to get started.
How to use Case Converter
- Paste or type your input. You can also load the example below.
- Adjust the available options. Results update after you finish typing; for very large inputs, select Run.
- Review the result, then copy it or download it to your device.
Letter case tools
Start with a specific case style or compare all available conversions.
How this tool works
Title case keeps short connecting words lowercase inside each line. Code styles treat each line as an identifier and split existing camel-case boundaries. Sentence case can preserve words made of two or more uppercase letters.
Input and output stay in the current page. Refreshing or closing the page clears them. For very large inputs, use Run to start processing; a task that takes too long is stopped so you can change the input.
Frequently asked questions
Which letter-case styles can I convert between?
Choose uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case, kebab-case, or CONSTANT_CASE. The same input can be converted again after selecting a different style.
How are existing code identifiers split into words?
Code styles split camel-case boundaries and separate letter or number groups at punctuation. Each line is handled as its own identifier. For example, getUserID becomes get_user_id in snake_case.
Does Preserve uppercase acronyms apply to every style?
No. That option applies to sentence case only. Title case lowercases words before capitalizing them, while code styles apply their own casing rules.