Case Converter

Type or paste your text, pick a style, get it back. Eleven conversions, live, in your browser. Nothing is uploaded.

Input

—

Pick a case

Output

About this tool

Case Converter changes the case of any block of text without touching its content. It supports eleven styles: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, aLtErNaTiNg, and inverse. Conversion is live: you type and the result updates without a button click. The implementation handles Unicode code points correctly so accented letters, Cyrillic, and CJK characters are not corrupted when the chosen style only affects ASCII letters. There is no upload and no API key — the conversion runs entirely in your browser on the text in the textarea.

When to use it

Renaming a JSON or YAML key from camelCase to snake_case before committing
Formatting constants for a CONFIG constant block in any language
Cleaning pasted prose that arrived in ALL CAPS or weird mixed case
Generating slug-style URL fragments from a heading without a build step

When not to use it

You need true Title Case with smart handling of small words (a, an, the, of) — the converter does a simple capitalise-on-space rule
You are working on code identifiers and need a language-aware rename — use your IDE's refactor tool instead
You need transliteration (Cyrillic → Latin, etc.) — this only changes case, not script

Frequently asked questions

Does it handle non-ASCII characters?

Yes. Case mapping follows the Unicode standard for code points that have a defined uppercase or lowercase form, so accented Latin, Greek, Cyrillic, and CJK are preserved correctly. Output is identical to JavaScript's String.prototype.toUpperCase and toLowerCase for those characters.

Is my text sent anywhere?

No. Conversion happens in a script running in your browser. The text you paste never leaves your device — refresh the page and it's gone.

What is the difference between camelCase and PascalCase?

camelCase starts the first word in lowercase and capitalises every subsequent word (userName, getUserById). PascalCase capitalises every word including the first (UserName, GetUserById). The converter applies the rule consistently across the whole input.

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