Case Converter
Change text to sentence case, lower case, UPPER CASE, Title Case, camelCase, snake_case and more, with undo.
Typed a paragraph with Caps Lock on? Need a headline in proper Title Case, or a variable name in camelCase? Paste the text, press one button, and it is fixed. Every change can be undone.
How to use the Case Converter
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Paste your text
Type or paste the text you want to change into the box.
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Pick a case
Press Sentence case, lower case, UPPER CASE, Title Case or any of the other options.
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Copy the result
Copy the converted text or download it. Press Undo if you want the previous version back.
Features
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12 case styles
Everyday writing styles plus programming cases like camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.
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Smart title case
Short words like “and”, “of” and “the” stay lower case unless they start or end the title.
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Proper sentence case
Capitalises the first letter of each sentence and the word “I”.
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Undo and redo
Try different styles and step back with Ctrl+Z at any time.
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Handles accents
Letters like é, ü and ñ are converted correctly.
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Private
All conversion happens in your browser.
When to use it
Fixing Caps Lock mistakes
Turn a paragraph typed in capitals back into normal sentences.
Headlines and titles
Give blog posts, YouTube videos and slides a consistent Title Case style.
Coding
Turn a phrase into a variable, function, file or constant name in the style your project uses.
Data clean up
Make names, product titles and spreadsheet columns consistent before importing them.
Sentence case or title case?
Sentence case capitalises only the first word and names, like a normal sentence. Many news sites and Google itself use it for headings because it is easier to read. Title Case capitalises the main words and is common in books, films and many blogs.
The programming cases explained
camelCase is common for JavaScript variables, PascalCase for class names, snake_case for Python and databases, kebab-case for URLs and CSS classes, and CONSTANT_CASE for constants and environment variables.
Which case to use where
For headings on a website, pick one style and use it everywhere; mixing Title Case and sentence case on the same site looks careless. Email subject lines read more naturally in sentence case. Product names and brands keep their own official capitalisation, whatever style you choose.
In code, follow the convention of the language or project you are working in rather than personal taste. Consistent naming makes code easier to search and review, which is why many teams enforce it automatically with linters. Our converter treats each line as a separate name, so you can convert a whole list of field names in one go.
Frequently asked questions
How do I change uppercase to lowercase?
Paste the text and press lower case. Use Sentence case instead if you want normal capital letters at the start of sentences.
What is title case?
A style where the main words of a title start with a capital letter, while short words like "a", "of" and "the" stay lower case unless they come first or last.
Can I undo a conversion?
Yes. Press Undo or Ctrl+Z to go back to the previous version, as many times as you need.
Does it keep line breaks?
Yes. Line breaks and paragraphs are kept for every writing style, and programming cases convert each line separately.
Is my text uploaded?
No. Everything happens in your browser.
What is camelCase?
A style used in programming where words are joined without spaces and each word after the first starts with a capital, like userFirstName.