Case Converter
Convert text to uppercase, lowercase, title case, sentence case and developer naming styles.
Convert text to uppercase, lowercase, title case, sentence case and developer naming styles. Paste or type your text and the result updates instantly. Everything runs in your browser, so nothing is uploaded, nothing is stored, and there is no limit on how much text you can process.
What Case Converter does
This page offers every case style in one place so you can compare them before committing. Each conversion works on the same input, which makes the differences between title case and sentence case, or between snake_case and kebab-case, easy to see side by side.
Your text never leaves your device
This tool is written in JavaScript and runs locally in the browser tab. No text is transmitted to a server, none is written to a log, and none is retained after you close the page. That makes it safe for drafts, client work and anything else you would rather not paste into an online form.
Why results can differ from other tools
Text processing involves judgement calls: what counts as a word, whether a hyphenated compound is one token or two, how a line ending is treated. Different tools resolve these differently, so a small discrepancy between this and a word processor is expected rather than an error.
Worked example
Run on a short sample so you can see exactly what changes before pasting your own text:
| Input | Output |
|---|---|
| the quick brown fox. jumps over IT | The Quick Brown Fox. Jumps Over It |
Frequently asked questions
What is the difference between title case and sentence case?
Title case capitalises the first letter of every word, as in "How To Write Well". Sentence case capitalises only the first word and any proper nouns, as in "How to write well". Most publications use sentence case for headings now.
What are camelCase and snake_case for?
They are naming conventions for code. camelCase joins words with capitals and no spaces, snake_case joins them with underscores, and kebab-case uses hyphens. Which one you use depends on the language and the project style guide.
Is Case Converter free to use?
Yes, completely. There is no account, no sign-up, no usage limit and no watermark. Every tool on this site runs in your browser and stays free.
Does my text get uploaded anywhere?
No. The processing happens locally in your browser using JavaScript. Your text is never transmitted to a server, never logged and never stored.