Case Converter Online – Change Text Case Instantly

Convert text between UPPERCASE, lowercase, Title Case, camelCase, and more, instantly in your browser. Free, unlimited, and 100% private: your text never leaves your device.

🔤 Private by design: every conversion happens directly in your browser using JavaScript. Nothing you type is uploaded, stored, or sent anywhere.

No character limit — paste or type as much text as you like.

Words: 0Characters: 0

Tip: camelCase, PascalCase, snake_case, and kebab-case strip spaces and punctuation, since those styles are meant for variable and file names.

Free Online Case Converter – Change Text Case Instantly

Retyping a paragraph just to fix its capitalization wastes time. Our free case converter changes your text between ten different case styles in a single click: UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg cAsE, tOGGLE cASE, camelCase, PascalCase, snake_case, and kebab-case. Paste your text once, then click through the styles until you find the one you need. The tool also shows a live word and character count as you convert.

Everything runs directly in your browser using JavaScript — nothing you type is uploaded, stored, or sent to a server. There is no character limit, so you can paste a single word or a full manuscript. It works instantly on Windows, Mac, Android, and iPhone, with no signup and no ads.

Who Uses a Case Converter?

Writers, editors, and students use it to fix a paragraph typed with Caps Lock left on, or to switch a headline to consistent Title Case. Social media managers use Sentence case for captions and Title Case for post titles. Legal and business writers use UPPERCASE sparingly for emphasized clauses, headings, and disclaimers — while avoiding the "all caps" trap of sounding like shouting. Developers use it most of all: turning a plain English phrase like "user profile image URL" into a valid variable name in camelCase (userProfileImageUrl) or PascalCase (UserProfileImageUrl), or into a file name in snake_case (user_profile_image_url) or kebab-case (user-profile-image-url). Anyone copying text from a PDF or email where the case got mangled can use it to clean things up in a second.

How the Ten Case Styles Work

Each style has its own rules and its own typical use. UPPERCASE and lowercase convert every letter in one direction. Title Case capitalizes the first letter of each word and lowercases the rest — the standard for book titles, headlines, and named sections. Sentence case capitalizes the first letter of the text and the first letter after each period, question mark, or exclamation point — the natural style for paragraphs and captions. aLtErNaTiNg cAsE and tOGGLE cASE are the "fun" styles used for memes and mockery — the first alternates caps and lowercase across the text, the second inverts the case of every letter. The four programming styles strip out spaces and punctuation and treat each word separately, matching the naming conventions developers use every day: camelCase for variables and functions, PascalCase for classes and React components, snake_case for Python functions and some languages' constants, and kebab-case for URLs, CSS class names, and file names in many ecosystems.

Private, Fast, and Completely Free

Every conversion runs directly inside your browser using JavaScript, so your text is never uploaded to a server or stored anywhere. It works instantly on Windows, Mac, Android, and iPhone, with no sign-up and no limit on how much text you paste in. Because nothing leaves your device, it is safe to use on confidential drafts, legal text, and anything you would not paste into a cloud service. If you also need to count words and characters with platform limits — for example for a tweet or an SEO meta description — try our dedicated Word & Character Counter tool alongside this one.

Frequently Asked Questions

What is the difference between camelCase and PascalCase?

Both remove spaces and capitalize the start of every word after the first, but camelCase keeps the very first letter lowercase (helloWorld), while PascalCase capitalizes it too (HelloWorld). Programmers typically use camelCase for variables and functions, and PascalCase for class and component names.

Does Sentence case fix capitalization after abbreviations correctly?

Sentence case capitalizes the first letter of the text and the first letter after a period, question mark, or exclamation point. It can occasionally over-capitalize after an abbreviation like "e.g." or "Mr.", since it cannot tell an abbreviation apart from the end of a sentence, so it is worth a quick proofread on text with a lot of abbreviations.

Why do camelCase, PascalCase, snake_case, and kebab-case remove spaces?

These styles are designed for code, URLs, and file names — environments where spaces are not allowed or would cause problems. Stripping spaces and punctuation and joining the words with capitals (camelCase, PascalCase) or with underscores and hyphens (snake_case, kebab-case) produces identifiers that are safe to use as variable names, file names, or URL slugs.

Is my text saved or sent anywhere?

No. Every conversion happens directly in your browser using JavaScript. Your text is never uploaded to a server, stored, or shared, and it disappears the moment you close or refresh the page.

camelCase aur PascalCase mein kya farq hai?

Dono spaces hata kar har word ke pehle letter ko capitalize karte hain, magar camelCase mein pehla letter chota rehta hai (helloWorld), jabke PascalCase mein pehla letter bhi capital hota hai (HelloWorld). Programmers aam tor par variables ke liye camelCase aur class ya component names ke liye PascalCase istemal karte hain.

Sentence case abbreviations ke baad capitalization theek karta hai?

Sentence case text ka pehla letter aur period, question mark ya exclamation point ke baad wala pehla letter capitalize karta hai. Ye kabhi kabhi "e.g." ya "Mr." jaise abbreviations ke baad extra capital laga deta hai, kyunke ye abbreviation aur sentence ke end mein farq nahi kar sakta, is liye bohot zyada abbreviations wale text ko aik dafa proofread kar lein.

Kya mera text kahin save ya send hota hai?

Nahi. Har conversion seedha aapke browser mein JavaScript se hoti hai. Aapka text kabhi kisi server par upload, save ya share nahin hota, aur page close ya refresh karte hi khatam ho jata hai.