html css editor

Live Web Editor

The Best Free Online HTML Editor and CSS Editor

Whether you are a beginner learning the basics or a professional debugging a complex layout, htmlcsseditor.com provides the speed and features you need. Our integrated environment allows you to write, modify, and see the results of your HTML and CSS code in real-time, eliminating the need for local setup or constant browser refreshes.

Dedicated HTML Editor

Our HTML editor pane provides a clean, distraction-free interface for writing semantic markup. Quickly prototype web pages, test new structural elements, or validate existing code snippets directly in your browser. It’s the perfect sandbox for rapid development.

Integrated CSS Editor

Use our CSS editor to bring your HTML to life. Write style declarations and observe changes instantly in the preview panel. Paired with our Minify and Format tools, our **online CSS editor** helps you maintain high-quality, efficient stylesheets without leaving the page.

Instant, Free & Accessible

Forget installing local software. Our free online HTML CSS editor is accessible from any modern browser, tablet, or mobile device. Simply open the page, and start coding immediately—it's the quickest way to test web snippets or practice your coding skills.

`; previewFrame.srcdoc = previewContent; }, 300); }htmlEditor.on('change', updatePreview); cssEditor.on('change', updatePreview); jsEditor.on('change', updatePreview);// --- CSS MINIFY TOOL LOGIC --- const minifyModal = document.getElementById('minify-modal'); const openMinifyBtn = document.getElementById('minify-css-btn'); const closeModalBtn = document.getElementById('close-modal-btn'); const copyMinifiedBtn = document.getElementById('copy-minified-btn'); const minifiedCssOutput = document.getElementById('minified-css-output');function minifyCSS(cssString) { let content = cssString; // Remove comments content = content.replace(/\/\*[\s\S]*?\*\/|\/\/.*/g, ""); // Remove extra whitespace content = content.replace(/\s+/g, " "); // Remove whitespace around selectors and rules content = content.replace(/\s*([{}|:;,])\s*/g, "$1"); // Remove last semicolon in a ruleset content = content.replace(/;}/g, "}"); return content.trim(); }openMinifyBtn.addEventListener('click', () => { const originalCSS = cssEditor.getValue(); const minifiedCSS = minifyCSS(originalCSS); minifiedCssOutput.value = minifiedCSS; minifyModal.classList.remove('hidden'); });closeModalBtn.addEventListener('click', () => { minifyModal.classList.add('hidden'); }); // Close modal when clicking outside of it minifyModal.addEventListener('click', (event) => { if (event.target === minifyModal) { minifyModal.classList.add('hidden'); } });copyMinifiedBtn.addEventListener('click', () => { minifiedCssOutput.select(); document.execCommand('copy'); const originalText = copyMinifiedBtn.textContent; copyMinifiedBtn.textContent = translations[currentLang]['copied_btn']; copyMinifiedBtn.disabled = true;setTimeout(() => { copyMinifiedBtn.textContent = originalText; copyMinifiedBtn.disabled = false; // Reset button text based on current language setLanguage(currentLang); }, 2000); });// --- PANE RESIZING LOGIC --- const resizer = document.getElementById('resizer'); const editorPane = document.getElementById('editor-pane'); const mainContainer = document.getElementById('main-container'); let isResizing = false;resizer.addEventListener('mousedown', (e) => { e.preventDefault(); isResizing = true; document.addEventListener('mousemove', handleMouseMove); document.addEventListener('mouseup', stopResizing); });function handleMouseMove(e) { if (!isResizing) return; const containerRect = mainContainer.getBoundingClientRect(); let newEditorWidth = e.clientX - containerRect.left; if (newEditorWidth < 200) newEditorWidth = 200; if (newEditorWidth > containerRect.width - 200) newEditorWidth = containerRect.width - 200; editorPane.style.width = `${newEditorWidth}px`; }function stopResizing() { isResizing = false; document.removeEventListener('mousemove', handleMouseMove); document.removeEventListener('mouseup', stopResizing); }// --- INITIAL SETUP --- document.addEventListener('DOMContentLoaded', () => { htmlEditor.setValue( `

Hello, World!

Write your code on the left and see the result here.

`); cssEditor.setValue( `/* Write your CSS code here. Try the "Minify" button above! */ body { font-family: sans-serif; background-color: #f0f0f0; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; }.container { text-align: center; padding: 2rem; background-color: white; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); }h1 { color: #333; }button { background-color: #007bff; color: white; border: none; padding: 10px 20px; border-radius: 5px; cursor: pointer; transition: background-color 0.3s; }button:hover { background-color: #0056b3; }`); jsEditor.setValue( `// Write your JavaScript code here const button = document.getElementById('myButton');button.addEventListener('click', () => { const heading = document.querySelector('h1'); heading.textContent = 'You clicked the button!'; });`);const savedLang = localStorage.getItem('editor_language') || 'en'; languageSelector.value = savedLang; setLanguage(savedLang); updatePreview(); });