Case Converter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case and developer formats like camelCase and snake_case — instantly, right in your browser.
How to change text case online
Changing letter case by hand is tedious — retyping a heading that was pasted in all caps, or fixing a sentence typed with caps lock on, wastes time. This free case converter does it in one click and keeps your original text untouched, so you can try several formats before copying the result.
Paste your text
Type or paste any text into the input box. The word and character counts update as you type.
Pick a case
Click UPPERCASE, lowercase, Title Case, Sentence case — or a developer format like camelCase or snake_case.
Copy or download
Copy the result to your clipboard with one click, or download it as a .txt file. Nothing is uploaded — everything runs locally.
When each case style is useful
UPPERCASE is used for emphasis, acronyms and labels. lowercase fixes text that was accidentally typed with caps lock, and is the standard for email addresses and URLs. Title Case capitalizes every word and is common for headlines, book titles and navigation labels, while Sentence case reads like normal prose and is the recommended style for most interface text and body copy.
Developers use the remaining formats daily: camelCase for JavaScript and Java variable names, snake_case for Python identifiers and database columns, and kebab-case for file names, CSS classes and SEO-friendly URLs. Converting a phrase like "customer order history" into any of these takes one click instead of manual editing.
Frequently asked questions
How do I convert uppercase text to lowercase?
Paste your text into the input box and click the lowercase button. The converted text appears instantly and can be copied with one click or downloaded as a .txt file.
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every word, which is common for headlines. Sentence case only capitalizes the first letter of each sentence, which is how normal prose is written.
Is my text uploaded to a server?
No. The case converter runs entirely in your browser using JavaScript. Your text never leaves your device.
Can I convert text to camelCase or snake_case?
Yes. Besides the standard cases, the tool supports developer formats: camelCase, snake_case and kebab-case, which are common for variable names, file names and URLs.