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Case Converter: Uppercase, Lowercase & Title Case

Change text to upper, lower, title, sentence or code case as you type.

Runs locally · nothing is uploaded 

Converted text appears here…

Features

Live as you type

Pick a case and the result follows every keystroke. Switch cases without pasting the text again.

Title Case for headlines

Short words like of, and and the stay lowercase inside a title; names like iPhone and NASA keep their capitals.

Code cases too

camelCase, snake_case and kebab-case split words at spaces, dashes, underscores and existing capitals.

How to use

  1. 1 Type or paste your text into the box on the left.
  2. 2 Click the case you want: the converted text appears on the right and updates as you type.
  3. 3 Click Copy to take the result, or pick another case to compare.

Common use cases

  • Fixing a paragraph typed with Caps Lock on
  • Turning headlines and blog titles into proper Title Case
  • Naming variables and functions in camelCase or snake_case
  • Making URL slugs and CSS class names in kebab-case
  • Tidying product names or spreadsheet headers before an import

About this tool

A case converter rewrites the capitals in a text without touching the words: a paragraph typed with Caps Lock on becomes readable again, a headline gets proper Title Case, a list of labels becomes the camelCase or snake_case names your code expects.

Every line is converted on its own, so lists and columns keep their shape, and you can switch between cases as often as you like: the original text stays in the box on the left.

This tool is built by ToolClack and, like everything we make, it is local-first: your data stays in your browser.

Frequently asked questions

Which words stay lowercase in Title Case?

Short joining words: a, an, and, as, at, but, by, for, in, nor, of, on, or, per, the, to, via and vs. They are still capitalized when they start or end a line, or right after punctuation such as a colon.

What happens to names like iPhone or NASA?

In Title Case and Sentence case, words that already mix capitals are kept as they are. When a whole line is in capitals there is no telling names apart, so every word on it is converted.

How are words split for camelCase, snake_case and kebab-case?

At spaces, punctuation, dashes, underscores and existing capitals, so My Variable Name, my-variable-name and myVariableName all give the same words. Apostrophes are dropped, and each line is converted on its own.

Is my text uploaded anywhere?

No. The conversion runs in your browser as you type; your text never leaves your device.

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