Case Converter
Instantly switch your text between UPPERCASE, lowercase, Title Case, Sentence case, and more. Paste your content, pick a style, and copy the result in one click.
A case converter is a text transformation tool that changes the capitalization pattern of your writing without altering the words themselves. Every written language has conventions around when to capitalize letters: the start of a sentence, proper nouns, titles of books and articles, or even entire words used for emphasis. A case converter automates all of those adjustments so you can reformat large blocks of text instantly rather than retyping them by hand.
Writers, developers, students, and marketers regularly need to switch between uppercase headings, sentence-style body text, and title-cased headlines. Doing this manually is slow and error-prone, especially with long documents. Our case converter handles seven distinct capitalization styles including alternating case and inverse case, which are tedious to produce character by character. All processing happens in your browser — nothing is stored.
- Paste or type your text into the input box above. There is no character limit.
- Review the live character and word count displayed beneath the input to confirm your text loaded correctly.
- Click the conversion buttonthat matches the style you need (e.g., "Title Case" or "UPPERCASE").
- Check the output in the converted-text area. You can click a different button at any time to switch styles without re-entering your text.
- Press the Copy button next to the output field to copy the result to your clipboard, then paste it wherever you need it.
UPPERCASE
Converts every letter to its capital form. Commonly used for headings, acronyms, and emphasis. Example: "hello world" becomes "HELLO WORLD".
lowercase
Converts every letter to its small form. Useful for normalizing text, preparing data for comparison, or achieving a casual tone. Example: "HELLO WORLD" becomes "hello world".
Sentence case
Capitalizes only the first letter of each sentence while making the rest lowercase. Ideal for body paragraphs and standard prose. Example: "hello world. goodbye world" becomes "Hello world. Goodbye world".
Title Case
Capitalizes the first letter of major words while keeping minor words (a, an, the, and, etc.) lowercase, except at the start. Used in headlines and book titles. Example: "the lord of the rings" becomes "The Lord of the Rings".
Capitalize Each Word
Capitalizes the first letter of every word regardless of whether it is a minor word. Example: "hello world" becomes "Hello World".
aLtErNaTiNg CaSe
Alternates between lowercase and uppercase for each letter, starting with lowercase. Often used for sarcastic or humorous tone on social media. Example: "hello world" becomes "hElLo wOrLd".
iNVERSE cASE
Swaps the current case of each character: uppercase letters become lowercase and vice versa. Example: "Hello World" becomes "hELLO wORLD".
| Case Type | Result |
|---|---|
| UPPERCASE | HELLO WORLD |
| lowercase | hello world |
| Sentence case | Hello world |
| Title Case | Hello World |
| Capitalize Each Word | Hello World |
| aLtErNaTiNg CaSe | hElLo WoRlD |
| iNVERSE cASE | HELLO WORLD |
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of most words (skipping minor words like "a", "the", and "of"), making it suitable for headlines and book titles. Sentence case only capitalizes the first letter of each sentence, just as you would write a normal paragraph.
Does the converter handle acronyms like NASA or HTML?
The converter applies the chosen rule uniformly to every letter. If you select lowercase, "NASA" becomes "nasa". For Sentence case and Title Case the acronym letters after the first will become lowercase. You may need to manually correct well-known acronyms after conversion.
Is this tool free? Is my text private?
Yes, the case converter is completely free with no sign-up required. All processing happens in your browser — nothing is stored on any server. Your text never leaves your device.
Can I convert the text back to its original form?
The tool does not store your original input after you clear it. However, as long as your source text remains in the input box you can click any conversion button to try a different style. Use your browser's undo (Ctrl+Z) in the input field if you accidentally overwrite your source text.
Does it work with special characters and non-English letters?
Yes. The converter relies on JavaScript's built-in Unicode methods, so accented characters (e.g., e with accent, u with umlaut), Cyrillic letters, and other scripts are handled correctly. Symbols, numbers, and punctuation are left unchanged.