Case Converter
Instantly convert your text between 20 case styles, right in your browser.
What does this Case Converter do?
This tool rewrites your text into 20 different letter-casing styles right inside your browser. Type or paste your content into the editor, then pick a style such as UPPER CASE, Title Case, camelCase, or snake_case, and the result updates immediately. A one-click Original button always brings back your starting text, and a live counter tracks words, characters, sentences, and paragraphs as you work. You can also upload a .txt or .docx file directly, then copy the converted result or download it again as a new .txt or .docx file.
How to Use This Case Converter?
- Add your text. Type directly into the editor, use the paste icon to pull text from your clipboard, or upload a .txt or .docx file with the upload icon.
- Pick a case style. Click any of the 20 buttons in the side panel, from lower case and UPPER CASE to camelCase, snake_case, or Upside Down.
- Review the result. The editor updates instantly, and the Words, Characters, Sentences, and Paragraphs counters below it refresh automatically.
- Try another style anytime. Click Original to reset the editor back to exactly what you typed, then pick a different case without retyping anything.
- Copy or download. Use the copy icon to grab the converted text right away, or open the download menu to save it as a .txt or .docx file.
- Clear when finished. Use the trash icon to wipe the editor and start on a new piece of text.
Built-In Features
20 Case Styles in One Panel
Switch between lower case, UPPER CASE, Sentence case, Title Case, Capital Case, camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, dot.case, path/case, Header-Case, no case, Pascal_Snake, Inverse Case, aLtErNaTiNg, Reverse Case, Random Case, and Upside Down, all with a single click. Most competing tools stop at four or five basic options.
Context-Aware Sentence Case
Sentence case is not a plain first-letter capitalizer. It recognizes common abbreviations, protects URLs and email addresses, and keeps known proper nouns and acronyms correctly capitalized so paragraphs still read naturally. It also preserves familiar technical terms, brand names, titles, and other important capitalization patterns, helping your text look polished, readable, and consistent across different types of content.
One-Click Restore
Your original text is kept in memory the moment you start typing. Hit the Original button at any point to instantly undo every conversion and get back exactly what you started with, without losing any of your original text.
Import and Export Files
Upload a .txt or .docx file to pull its text straight into the editor, then download your converted result as a fresh .txt or .docx file whenever you are done. Most online case converters only support copy and paste.
Live Text Statistics
Word count, character count, sentence count, and paragraph count sit right beside the case buttons and recalculate the moment you type, paste, upload, or convert.
Browser-Based Privacy
Every conversion, file upload, and file download runs locally in your browser. Your text and documents are never sent to a server or stored anywhere online.
How Smart Sentence Case Works
Turning a block of text into clean Sentence case takes more than capitalizing the first letter of every sentence, which is where many basic converters fall short. This tool checks the text against several rules before deciding what to capitalize.
Abbreviation Detection
Dozens of common abbreviations, such as Mr., Dr., approx., vs., and a.m., are recognized so the periods inside them are never mistaken for the end of a sentence. The word right after a title like Dr. or Prof. is capitalized correctly too.
Proper Noun and Link Protection
Days of the week, months, languages, countries, and major holidays keep their capital letters instead of being forced to lower case, and URLs and email addresses are left exactly as typed so links never break during conversion.
Recognized acronyms such as NASA, HTML, and API keep their capitalization when they are already typed that way, and common tech terms like javascript or json are converted to their standard written form, JavaScript and JSON, automatically.
Which Case Style Should You Use?
Each case style suits a different situation, and picking the right one matters as much for developers naming variables as it does for writers formatting a headline.
| Case Style | Example | Typically Used For |
|---|---|---|
| Sentence case | Hello world | Emails, articles, everyday paragraphs |
| Title Case | Hello World | Headlines, blog titles, book titles |
| UPPER CASE | HELLO WORLD | Warnings, banners, strong emphasis |
| camelCase | helloWorld | JavaScript and Java variable names |
| PascalCase | HelloWorld | Class names and component names |
| snake_case | hello_world | Python variables and database fields |
| kebab-case | hello-world | URL slugs, CSS classes, file names |
| CONSTANT_CASE | HELLO_WORLD | Constants and environment variables |
Title Case Rules: Which Words Stay Lowercase?
A common question when formatting a headline is why some words end up capitalized and others do not. Title Case in this tool follows the standard style guide convention used for headlines and titles: major words are capitalized, while short connecting words are kept lowercase, unless one of them happens to be the very first or the very last word of the text.
| Word Type | Kept Lowercase (Unless First or Last) | Example |
|---|---|---|
| Articles | a, an, the | The Lord of the Rings |
| Coordinating conjunctions | and, but, or, nor, for, so, yet | Salt and Pepper |
| Short prepositions | in, on, at, by, to, from, of, up, as | A Walk in the Park |
A word from this list at the very start or end of your text is still capitalized. That is why the Title Case button turns as into As at the beginning of a sentence, but leaves it lowercase in the middle.
Common Reasons to Use a Case Converter
Fixing Caps Lock Mistakes
Text typed with Caps Lock left on can be quickly switched back to Sentence case or Title Case in one simple click, without retyping a single word manually.
Naming Variables and Files
Convert a plain phrase into camelCase, PascalCase, snake_case, or kebab-case to match the naming convention used by your programming language or framework.
Formatting Headlines and Titles
Turn a rough draft into properly capitalized Title Case or Capital Case for headlines, presentation slides, document headings, blog titles, website sections, and professional content.
Cleaning Up Pasted Content
Text pasted from PDFs, emails, or scanned documents often has inconsistent casing. Running it through Sentence case tidies it up before you publish or share it.
Meme Text and Social Media Case Styles
Not every case style is meant for formal writing. Several of the styles in this tool exist purely for casual, playful, or attention-grabbing text, and they cover some of the most searched text tricks online.
aLtErNaTiNg Case for Mocking Text
The alternating case style toggles every letter between upper and lower, the same look used for sarcastic mocking text memes and quote reposts on social media.
Upside Down Text for Captions
The Upside Down style flips your letters and numbers into their upside down look and reverses the order, a novelty effect people use for bios, captions, and flipped text pranks.
Inverse and Random Case
Inverse Case swaps every letter’s existing case, while Random Case scrambles capitalization unpredictably, both used for a fun, chaotic aesthetic in usernames and short posts.
All Lowercase for Minimalist Bios
The lowercase style strips every capital letter, matching the quiet, minimalist look many people prefer for clean social media bios and profile names.
Useful Tips
Remove Extra Spaces First
If your pasted text has double spaces or uneven gaps, clean it up with the Extra Spaces Remover before converting the case, so the final result is tidy from start to finish.
Keep the Original Until You Are Done
Your first version stays saved behind the scenes, so feel free to try several case styles in a row and hit Original whenever you want to start comparing again.
Flip Text for Creative Projects
Need a mirrored effect for a puzzle, caption, or novelty message? The Text Reverser flips the order of your characters once your casing is set the way you want it.
Upload Instead of Retyping
For longer Word documents, use the upload button instead of copying and pasting. The full text loads into the editor automatically, ready for quick and easy conversion.
Frequently Asked Questions
What is this case converter tool used for?
It rewrites any text you type, paste, or upload into one of 20 letter-casing styles, such as UPPER CASE, Title Case, camelCase, or snake_case, instantly and without leaving your browser.
Is this case converter free to use?
Yes. The tool is free to use and does not require an account or sign-up.
How does Sentence case handle abbreviations like Dr. or a.m.?
The tool recognizes a wide list of common abbreviations so the period inside them is not read as the end of a sentence, and it capitalizes them correctly rather than leaving them lower case.
Will the tool change the text inside a URL or email address?
No. URLs and email addresses are detected and left untouched during Sentence case conversion so links and addresses stay usable.
What is the difference between camelCase and PascalCase?
camelCase starts with a lower case letter, like helloWorld, while PascalCase capitalizes the first letter of every word, like HelloWorld. Both are available as one-click options.
Can I convert multiple lines of text at once?
Yes. Styles like snake_case, kebab-case, camelCase, and PascalCase process each line of your text separately, so a multi-line list converts cleanly line by line.
Does it work with uploaded Word documents?
Yes. Uploading a .docx file extracts its text directly into the editor, ready for you to pick a case style.
Can I download my converted text as a Word file?
Yes. The download menu lets you save your converted text as either a .txt file or a .docx file.
Is my text uploaded to a server?
No. All typing, file reading, case conversion, and file downloading happen locally in your browser. Nothing is sent to a server.
Does it recognize proper nouns like country names or days of the week?
Yes. Sentence case recognizes common proper nouns, including days of the week, months, languages, countries, and major holidays, and keeps their capital letters correct.
Can I undo a conversion and get my original text back?
Yes. Click the Original button in the case panel at any time to instantly restore the text exactly as you first typed or pasted it.
Does this tool count words and characters?
Yes. Word count, character count, sentence count, and paragraph count are shown below the editor and update automatically as your text changes.
Does this tool work on mobile devices?
Yes. The tool is fully responsive and works the same way on phones, tablets, and desktop browsers.