Case Converter — UPPER, lower, camelCase

What it is

This case converter turns your text into nine formats at the same time. Use it for ordinary writing, like making a heading Title Case or fixing text typed with caps lock on, or for code, like converting a phrase to camelCase, PascalCase, snake_case, kebab-case or CONSTANT_CASE. Each result has its own copy button.

How to use

1. Type or paste text. Every format updates as you type.
2. With several lines, the programming formats (camel, Pascal, snake, kebab, constant) are applied to each line separately and line breaks are kept.
3. Choose a language rule if you need one, such as Turkish.
4. Press Copy next to the format you want.

How it works

• UPPER and lower use the browser’s locale-aware conversion, so Unicode rules apply: the German ß becomes SS in uppercase.
• Title Case capitalizes the first letter of each word and lowercases the rest. A letter after an apostrophe is not treated as a new word, so it’s becomes It’s.
• Sentence case lowercases everything, then capitalizes the first letter of each sentence: at the start and after a period (.), question mark (?), exclamation mark (!) or line break. Other punctuation such as a colon does not start a sentence.
• Word splitting breaks at spaces and punctuation, between a lowercase letter or digit and a capital, and before the last capital of an acronym that is followed by lowercase, as in XML and Http.
• camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE join the split words with no separator, an underscore or a hyphen. Punctuation is treated as a separator and dropped, so don’t becomes don_t in snake_case.
• Characters without case, including Korean, Chinese, Japanese and emoji, are never changed by case conversion.

Examples

Input	Format	Result
hello world foo	camelCase	helloWorldFoo
XMLHttpRequest	snake_case	xml_http_request
XMLHttpRequest	kebab-case	xml-http-request
base64Encode	CONSTANT_CASE	BASE64_ENCODE
the quick BROWN fox	Title Case	The Quick Brown Fox
안녕 세계	snake_case	안녕_세계
istanbul (Turkish)	UPPER	İSTANBUL