Free online case converter. Convert your text to uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case, kebab-case and more, instantly as you type. No sign up needed, works entirely in your browser.
How to Use This Case Converter
Paste or type your text into the input box at the top. Then click any of the 12 case buttons below the input. Your converted text appears instantly in the output box. Click Copy to copy the result or Download to save it as a text file. You can also click Swap to move the output back into the input and convert it again.
All 12 Case Types Explained
UPPER CASE
UPPER CASE converts every letter in your text to capital letters. For example hello world becomes HELLO WORLD. This is commonly used for headings, warnings and emphasis.
lower case
lower case converts every letter to lowercase. For example HELLO WORLD becomes hello world. This is used for normalising text and some coding styles.
Title Case
Title Case capitalises the first letter of every word. For example hello world becomes Hello World. This is used for book titles, article headings and proper names.
Sentence case
Sentence case capitalises only the first letter of each sentence. For example hello world. this is a test becomes Hello world. This is a test. This matches standard writing style.
camelCase
camelCase removes spaces and capitalises the first letter of each word except the first. For example hello world becomes helloWorld. This is widely used in JavaScript and other programming languages for variable names.
PascalCase
PascalCase is the same as camelCase but capitalises the first letter too. For example hello world becomes HelloWorld. This is used for class names in many programming languages.
snake_case
snake_case replaces spaces with underscores and makes everything lowercase. For example hello world becomes hello_world. This is commonly used in Python and database column names.
kebab-case
kebab-case replaces spaces with hyphens and makes everything lowercase. For example hello world becomes hello-world. This is commonly used in URLs and CSS class names.
CONSTANT_CASE
CONSTANT_CASE replaces spaces with underscores and makes everything uppercase. For example hello world becomes HELLO_WORLD. This is used for constants in many programming languages.
dot.case
dot.case replaces spaces with dots and makes everything lowercase. For example hello world becomes hello.world. This is used in some configuration files and package names.
aLtErNaTe CaSe
aLtErNaTe CaSe alternates between lowercase and uppercase for each letter. This is used for mocking text and humorous or sarcastic messages online.
iNVERSE cASE
iNVERSE cASE flips the case of every letter — uppercase becomes lowercase and lowercase becomes uppercase. For example Hello World becomes hELLO wORLD.
Who Uses a Case Converter
Case converters are used by developers who need to convert variable names between different coding conventions. Writers use them to quickly fix text that was typed in the wrong case. Content managers use title case for headlines and headings. Social media users use alternate case for humorous posts. Students use them to fix accidental caps lock typing. SEO writers use them to format headings consistently.
Frequently Asked Questions : FAQs
What is the difference between camelCase and PascalCase?
In camelCase the first word is lowercase and all following words start with a capital letter such as helloWorld. In PascalCase every word including the first starts with a capital letter such as HelloWorld. Both remove spaces between words.
What is the difference between snake_case and kebab-case?
Both replace spaces with a separator and use lowercase letters. Snake case uses an underscore between words such as hello_world. Kebab case uses a hyphen between words such as hello-world.
What is title case?
Title case capitalises the first letter of every word. It is used for book titles, article headings, movie names and product names. For example the quick brown fox becomes The Quick Brown Fox.
Can I convert multiple paragraphs at once?
Yes. Paste as much text as you like into the input box. All of it will be converted at once when you click a case type.
Is this case converter free?
Completely free. No sign up, no login, no limits.
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Last updated: March 2026 · Free tool by AllTheTools.com