Case Converter

How to use the Case Converter

Paste text once and switch between common capitalization formats. Everything stays editable so you can adjust the result before copying it.

Change text to upper case, lower case, title case, sentence case, or common identifier styles. It speeds up mechanical cleanup while keeping the original available for comparison.

The text stays in the browser while the tool analyzes or transforms it. Review the output before using it in a graded, published, legal, or accessibility-sensitive document.

1. Paste or type text into the editor.
2. Choose a prose capitalization mode or an identifier format such as camelCase, snake_case, or kebab-case.
3. Copy the transformed result or continue editing it in place.

Last reviewed for accuracy: 2026-09-01

Worked examples

How the result is produced

Case modes transform Unicode-aware letter casing supported by the browser. Identifier modes also split or join whitespace and punctuation to create separators or capital transitions.

• Upper and lower case transform letters but preserve most punctuation
• camelCase and snake_case also normalize word separators
• Title-case conventions differ on articles, prepositions, acronyms, and names

Text case versus identifier case

Uppercase, lowercase, title case, sentence case, and alternating case primarily change letter casing. camelCase, snake_case, and kebab-case also tokenize the input and rebuild separators, making them useful for code, filenames, slugs, and data fields.

• Use sentence or title case for prose that will still be proofread.
• Use camelCase for many code identifiers.
• Use snake_case or kebab-case only when the destination accepts those separators.

Limitations and common mistakes

• Automatic title case cannot infer preferred capitalization for brands, surnames, or acronyms.
• Locale-specific casing such as Turkish dotted and dotless I may require manual review.

Common questions