# Case converter

URL: https://shahid09.is-a.dev/tools/case-converter/
Author: Muhammad Shahid (https://shahid09.is-a.dev/)
Free tool · runs in your browser

Convert text to upper case, lower case, title case or sentence case, or to camelCase, snake_case and other formats used in code.

**Quick answer:** Paste your text and see it in nine formats at once: UPPERCASE, lowercase, Title Case, Sentence case, and the code styles camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. For code styles, words are split at spaces, punctuation and existing capitals, so userName and user_name both work as input.

## How to use it

1. **Paste your text.** A heading, a sentence, a variable name or a list of names.
2. **Find the format you need.** All nine versions appear at once, updating as you type.
3. **Copy it.** Use the Copy button next to the format you want.

## Example

One phrase in every format:

Input:

```
hello world from JSONParser v2
```

Output:

```
UPPERCASE      HELLO WORLD FROM JSONPARSER V2
Title Case     Hello World From Jsonparser V2
Sentence case  Hello world from jsonparser v2
camelCase      helloWorldFromJsonParserV2
PascalCase     HelloWorldFromJsonParserV2
snake_case     hello_world_from_json_parser_v2
kebab-case     hello-world-from-json-parser-v2
CONSTANT_CASE  HELLO_WORLD_FROM_JSON_PARSER_V2
```

## Common errors and how to fix them

- **Title Case capitalises "of" and "and"**: This tool capitalises every word. Style guides such as APA keep short words lower case; change those by hand.
- **Acronyms come out as Json or Api**: Converting to Title or code case lowers the rest of each word. Fix acronyms afterwards if your style keeps them in capitals.
- **A property is undefined after renaming**: Code is case-sensitive: userName and username are different keys. Use the exact case the API or database uses.
- **Turkish i becomes the wrong letter**: Turkish has dotted and dotless i. Upper and lower case use your browser's language; set it to Turkish for Turkish text.

## Frequently asked questions

### What is Title Case?

Every word starts with a capital letter, as in a book title. Style guides often keep short words such as of, and or the in lower case; adjust those by hand if your guide requires it.

### What is Sentence case?

Only the first letter of each sentence is a capital, like normal writing. Proper nouns need to be capitalised by hand afterwards.

### What is the difference between camelCase and PascalCase?

camelCase starts with a lower-case letter (userName); PascalCase starts with a capital (UserName). JavaScript variables usually use camelCase and class names PascalCase.

### When is snake_case used?

In Python variable and function names, database columns and many APIs, such as user_name.

### When is kebab-case used?

In URLs, CSS class names and file names, such as user-profile.

### What is CONSTANT_CASE?

Upper-case words joined by underscores, used for constants and environment variables, such as MAX_RETRIES or API_KEY.

### How do I fix text typed with Caps Lock on?

Paste it and copy the Sentence case or lowercase version.

### Does it work with accents and other languages?

Yes. Upper and lower case use your language's rules, so letters such as é and ü convert correctly. Hebrew and Chinese have no capital letters and stay the same.

### Why did JSONParser become json_parser?

Capital letters mark new words, so a run of capitals followed by a word is split before the last capital. Edit acronyms by hand if you need them different.

### Is my text sent anywhere?

No. Everything is converted in your browser.

## Related

- [Word counter](https://shahid09.is-a.dev/tools/word-counter/)
- [JSON formatter and validator](https://shahid09.is-a.dev/tools/json-formatter/)
- [Regex tester](https://shahid09.is-a.dev/tools/regex-tester/)