Case Converter

Convert text case and count words, characters, and sentences online.

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Free online text case converter and word counter

CaseConverter is a free online case converter and word counter tool built for speed. No popups, no cookie banners, no ads covering half the screen. Paste your text, pick a conversion, get your result. That's it.

Convert text case online

Uppercase and lowercase converter

Switch between 8 different text cases without retyping anything. Convert text to uppercase to fix caps lock mistakes, switch to lowercase for clean formatting, or use title case and sentence case to match your style guide. Every conversion happens in one click.

Word counter and character counter tool

Count words, characters, lines, and sentences as you type. Use the word counter to check essay requirements, the character counter to stay within Twitter/X or LinkedIn limits, or the sentence counter to audit readability before publishing. All counts update in real time.

No ads, no tracking, no signup

Most online case converter sites are built to farm ad impressions, not to help you. You end up scrolling past banners, closing modals, and waiting for the page to stop jumping around. CaseConverter loads instantly, runs entirely in your browser, and doesn't send your text anywhere. Your data stays on your device.

Who uses an online case converter?

Writers and editors

Check word count against assignment requirements. Convert headlines between title case and sentence case to match your style guide. Quickly lowercase a block of text someone typed in all caps.

Developers and programmers

Convert plain text to camelCase for JavaScript variables, kebab-case for CSS class names and URLs, or snake_case for Python variables and database column names. Faster than reformatting by hand, especially with long identifier strings.

Students and academics

Track your word count and sentence count while writing essays, dissertations, or research papers. No need to open a separate word processor just to check your progress against a word limit.

Social media managers and content creators

Keep your character count visible while drafting posts. Convert text case to match brand guidelines across platforms without editing each post individually.

How the case converter works

CaseConverter is a client-side text case converter that runs entirely in your browser using JavaScript. Nothing is sent to a server. When you type or paste text, the word counter, character counter, line counter, and sentence counter update in real time. Click any conversion button to transform your text in place, then copy the result with one click.

Frequently asked questions

A case converter changes the capitalization of your text. You can switch between uppercase, lowercase, title case, sentence case, and programming formats like camelCase, kebab-case, and snake_case without retyping anything.

Title case capitalizes the first letter of every word ("The Quick Brown Fox"). Sentence case only capitalizes the first letter of each sentence ("The quick brown fox"). Title case is common for headlines, sentence case for body text.

These are naming conventions in programming. camelCase joins words and capitalizes each one after the first (JavaScript). kebab-case uses hyphens between lowercase words (CSS, URLs). snake_case uses underscores (Python, databases).

Yes. Spaces, punctuation, and line breaks are all counted. This matches how platforms like Twitter/X and LinkedIn count characters toward their limits.

No. CaseConverter runs entirely in your browser. Your text never leaves your device. There's no tracking, no accounts, and no ads.

Completely free. No premium tiers, no limits, no signup. Just open it and use it.