Convert text to uppercase, lowercase, title case, or sentence case instantly.
0
0
0
What This Tool Does
A case converter lets you instantly transform text between different capitalization styles — from standard uppercase and lowercase to more specialized formats like Title Case and Sentence case. Rather than manually retyping text or hunting through your word processor's formatting options, you paste your content and click the format you need. The tool processes everything in your browser in real time, so results appear immediately without page reloads or server round-trips.
Text casing matters more than most people realize. Social media posts, blog titles, email subject lines, code identifiers, and document headings each follow different capitalization conventions. Inconsistent casing in a professional document can undermine credibility, while a URL slug in mixed case breaks readability. This tool gives you one place to handle all those transformations without switching between applications.
Convert text between uppercase, lowercase, title case, sentence case, and camelCase — all in one click. Paste your text, hit a button, copy the result.
When You'd Reach for This
Normalizing messy text. Got ALL CAPS copy you need to reformat? Or lowercase that needs proper capitalization for a title? One click fixes it.
Generating URL slugs. Use lowercase to create clean, SEO-friendly URLs like knexio.xyz/case-converter. Hyphens separate words; spaces break URLs.
Writing headlines. Title Case follows AP or Chicago style rules, so your headings look polished and professional across publications.
Coding variables. camelCase for JavaScript, PascalCase for class names, snake_case for Python — this handles the capitalization part, so you focus on the logic.
Cleaning imported data. When data from spreadsheets, databases, or exports arrives in inconsistent casing, batch-convert it to a standard format in seconds.
Social media consistency. Twitter, LinkedIn, and Instagram each have different conventions. Format posts for each platform quickly without retyping.
Case Types Explained
UPPERCASE — Converts all letters to capitals. Great for acronyms, emphasis, and headings.
lowercase — Converts all letters to small letters. Useful for URLs, email addresses, and coding variables.
Title Case — Capitalizes first letter of every word. Ideal for article titles, book names, and product headings.
Sentence case — Capitalizes only first letter of each sentence. Best for body copy, emails, and social media posts.
How It Works
Using the case converter is straightforward:
Paste or type your text into the input box at the top of the tool.
Choose a format. Click UPPERCASE, lowercase, Title Case, or Sentence case depending on what you need. The result appears immediately below your input — no submit button, no loading, no waiting.
Copy the result with the Copy button and paste it wherever you need it.
Track your text with the live character, word, and sentence counters shown below the input area. These update as you type or when you apply a case transformation.
All processing runs locally in your browser using JavaScript string methods. Nothing is sent to any server, meaning your text is never stored, logged, or accessible to anyone else.
Frequently Asked Questions
Is this tool free to use?
Yes, this tool is completely free to use. No registration, no login, and no subscription required. Just open the page and start using it.
Is my data safe? Is anything stored on a server?
Yes, your data is safe. All processing happens entirely in your browser — your input never leaves your device and is not sent to any server.
Does this tool work on mobile devices?
Yes. The tool is fully responsive and works on smartphones, tablets, and desktop computers.
How accurate is the result?
The tool uses standard algorithms and web APIs to provide accurate results. For critical or professional use, please verify with additional sources.
What's the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every significant word — including nouns, verbs, adjectives, and adverbs — while skipping minor words like "and," "or," "the," and "of" unless they start the title. Sentence case capitalizes only the first letter of the entire text and any proper nouns within it. For example: Title Case would be "The Quick Brown Fox Jumps Over the Lazy Dog," while Sentence case would be "The quick brown fox jumps over the lazy dog."
Does this tool support languages other than English?
The case conversion works best with standard Latin alphabet text. For languages that use accented characters (such as French, Spanish, or German), the tool preserves accented letters during conversion. However, languages with non-Latin scripts (Chinese, Arabic, Hebrew, etc.) or languages with complex capitalization rules may not convert correctly. For specialized Unicode scripts, a dedicated language-specific tool is recommended.
function lower(){var t=document.getElementById('input');if(!t) return;var r=t.value.toLowerCase();var tip=document.getElementById('tip');if(tip) tip.textContent='Copied: '+r.substring(0,200);document.getElementById('chars').textContent=t.value.length;document.getElementById('words').textContent=t.value.trim()?t.value.trim().split(/\s+/).length:0;document.getElementById('sentences').textContent=t.value.split(/[.!?]+/).filter(function(s){return s.trim().length>0}).length;navigator.clipboard.writeText(r).catch(function(){});}
function titleCase(){var t=document.getElementById('input');if(!t) return;var r=t.value.replace(/\w\S*/g,function(w){return w.charAt(0).toUpperCase()+w.substr(1).toLowerCase();});var tip=document.getElementById('tip');if(tip) tip.textContent='Copied: '+r.substring(0,200);document.getElementById('chars').textContent=t.value.length;document.getElementById('words').textContent=t.value.trim()?t.value.trim().split(/\s+/).length:0;document.getElementById('sentences').textContent=t.value.split(/[.!?]+/).filter(function(s){return s.trim().length>0}).length;navigator.clipboard.writeText(r).catch(function(){});}
function sentence(){var t=document.getElementById('input');if(!t) return;var r=t.value.replace(/(^\s*|[.!?]\s+)([a-z])/g,function(m,p,l){return p+l.toUpperCase();});var tip=document.getElementById('tip');if(tip) tip.textContent='Copied: '+r.substring(0,200);document.getElementById('chars').textContent=t.value.length;document.getElementById('words').textContent=t.value.trim()?t.value.trim().split(/\s+/).length:0;document.getElementById('sentences').textContent=t.value.split(/[.!?]+/).filter(function(s){return s.trim().length>0}).length;navigator.clipboard.writeText(r).catch(function(){});}
function clearText(){var t=document.getElementById('input');if(t)t.value='';var c=document.getElementById('chars');if(c)c.textContent='0';var w=document.getElementById('words');if(w)w.textContent='0';var s=document.getElementById('sentences');if(s)s.textContent='0';var tip=document.getElementById('tip');if(tip)tip.textContent='';}
function copyText(){var t=document.getElementById('input');if(t&&t.value){navigator.clipboard.writeText(t.value).catch(function(){});var tip=document.getElementById('tip');if(tip)tip.textContent='Copied to clipboard!';}}
// Update stats on input
var t=document.getElementById('input');if(t){t.addEventListener('input',function(){
var c=document.getElementById('chars');if(c)c.textContent=this.value.length;
var w=document.getElementById('words');if(w)w.textContent=this.value.trim()?this.value.trim().split(/\s+/).length:0;
var s=document.getElementById('sentences');if(s)s.textContent=this.value.split(/[.!?]+/).filter(function(x){return x.trim().length>0}).length;
});}
Frequently Asked Questions
What is the difference between Title Case and Sentence case?
Title Case capitalizes the first letter of every major word (articles like "a," "an," "the" are usually lowercase unless they start the title). Sentence case only capitalizes the first letter of the sentence and proper nouns. Use Title Case for headings and titles; use Sentence case for body text.
Can I convert text in languages other than English?
Yes! Our tool works with any language that uses the Latin alphabet. For languages like Chinese, Japanese, or Arabic, case conversion doesn't apply (those languages don't have uppercase/lowercase distinctions). The tool will preserve your text unchanged for non-Latin scripts.
Why does my text have weird spaces after conversion?
If you convert to "camelCase" or "snake_case," the tool removes spaces to create a valid identifier. This is intentional! If you want to preserve spaces, use "lower case" or "UPPER CASE" instead. You can also use the "Trim whitespace" button to clean up extra spaces before converting.
Is there a limit to how much text I can convert?
Nope! You can convert thousands of words at once. The tool processes everything in your browser, so there's no server-side limit. However, for very large texts (100,000+ words), your browser may take a few seconds to process. Be patient—it'll finish!
How do I copy the converted text to my clipboard?
Click the "Copy to Clipboard" button below the output box. The tool uses your browser's Clipboard API to copy the text. If that fails (some browsers block clipboard access), you can manually select the text and press Ctrl+C (Cmd+C on Mac) to copy.
Can I use this tool offline?
Once the page loads, yes! All processing happens in your browser. You can disconnect from the internet and keep using the tool. However, you'll need an internet connection to load the page initially (unless you've cached it).