Code Minifier – HTML, CSS & JS

HTML CSS JS Minifier

Minify your HTML, CSS, and JavaScript code to reduce file size and improve performance

HTML
CSS
JavaScript
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`, css: `/* This is a CSS reset */ * { margin: 0; padding: 0; box-sizing: border-box; }/* Main container styles */ .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 20px; }/* Header styles */ .header { background-color: #2c3e50; color: white; padding: 20px 0; text-align: center; }/* Navigation styles */ .nav { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; }.nav-list { list-style: none; display: flex; gap: 20px; }.nav-link { text-decoration: none; color: #3498db; transition: color 0.3s ease; }.nav-link:hover { color: #2980b9; }/* Responsive design */ @media (max-width: 768px) { .nav { flex-direction: column; } .nav-list { flex-direction: column; gap: 10px; } }`, js: `// This is a sample JavaScript file// Function to calculate factorial function calculateFactorial(number) { if (number < 0) { return -1; // Error case } else if (number === 0) { return 1; // Base case } else { return number * calculateFactorial(number - 1); // Recursive case } }// Function to validate email function validateEmail(email) { const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/; return emailRegex.test(email); }// DOM manipulation function function initializeApp() { const button = document.getElementById('myButton'); const output = document.getElementById('output'); if (button && output) { button.addEventListener('click', function() { const randomNumber = Math.floor(Math.random() * 100) + 1; output.textContent = 'Random number: ' + randomNumber; }); } }// Call initialization when DOM is loaded document.addEventListener('DOMContentLoaded', initializeApp);` }; // Event listeners codeTypeBtns.forEach(btn => { btn.addEventListener('click', () => { codeTypeBtns.forEach(b => b.classList.remove('active')); btn.classList.add('active'); currentType = btn.getAttribute('data-type'); loadSampleCode(); updateStats(); }); }); minifyBtn.addEventListener('click', minifyCode); copyBtn.addEventListener('click', copyMinifiedCode); resetBtn.addEventListener('click', resetTool); uploadBtn.addEventListener('click', () => fileInput.click()); fileInput.addEventListener('change', handleFileUpload); downloadBtn.addEventListener('click', downloadMinifiedCode); inputCode.addEventListener('input', updateStats); // Initialize with sample HTML code window.addEventListener('load', () => { loadSampleCode(); updateStats(); }); // Load sample code based on current type function loadSampleCode() { inputCode.value = sampleCode[currentType]; outputCode.value = ''; updateStats(); copyBtn.disabled = true; } // Update statistics function updateStats() { const inputText = inputCode.value; const outputText = outputCode.value; // Input stats const inputCharCount = inputText.length; const inputLineCount = inputText.split('\n').length; inputSize.textContent = `${inputCharCount} characters`; originalSize.textContent = inputCharCount.toLocaleString(); originalLines.textContent = inputLineCount.toLocaleString(); // Output stats if (outputText) { const outputCharCount = outputText.length; const outputLineCount = outputText.split('\n').length; outputSize.textContent = `${outputCharCount} characters`; minifiedSize.textContent = outputCharCount.toLocaleString(); minifiedLines.textContent = outputLineCount.toLocaleString(); // Calculate reductions const sizeReductionPercent = ((inputCharCount - outputCharCount) / inputCharCount * 100).toFixed(1); const lineReductionPercent = ((inputLineCount - outputLineCount) / inputLineCount * 100).toFixed(1); sizeReduction.textContent = `${sizeReductionPercent}% smaller`; lineReduction.textContent = `${lineReductionPercent}% fewer`; // Color code based on improvement sizeReduction.className = sizeReductionPercent > 0 ? 'stat-improvement' : 'stat-worsened'; lineReduction.className = lineReductionPercent > 0 ? 'stat-improvement' : 'stat-worsened'; copyBtn.disabled = false; } else { outputSize.textContent = '0 characters'; minifiedSize.textContent = '0'; minifiedLines.textContent = '0'; sizeReduction.textContent = '0% smaller'; lineReduction.textContent = '0% fewer'; copyBtn.disabled = true; } } // Minify code based on type function minifyCode() { const code = inputCode.value; if (!code.trim()) { showNotification('Please enter some code to minify', true); return; } let minified = ''; switch(currentType) { case 'html': minified = minifyHTML(code); break; case 'css': minified = minifyCSS(code); break; case 'js': minified = minifyJS(code); break; } outputCode.value = minified; updateStats(); showNotification('Code minified successfully!'); } // HTML minification function minifyHTML(html) { let minified = html; // Remove comments if option is checked if (removeComments.checked) { minified = minified.replace(//g, ''); } // Remove whitespace if option is checked if (removeWhitespace.checked) { // Collapse multiple spaces into one minified = minified.replace(/\s+/g, ' '); // Remove spaces between tags minified = minified.replace(/>\s+<'); // Trim minified = minified.trim(); } return minified; } // CSS minification function minifyCSS(css) { let minified = css; // Remove comments if option is checked if (removeComments.checked) { minified = minified.replace(/\/\*[\s\S]*?\*\//g, ''); } // Remove whitespace if option is checked if (removeWhitespace.checked) { // Remove spaces around braces and colons minified = minified.replace(/\s*{\s*/g, '{'); minified = minified.replace(/\s*}\s*/g, '}'); minified = minified.replace(/\s*:\s*/g, ':'); minified = minified.replace(/\s*;\s*/g, ';'); minified = minified.replace(/\s*,\s*/g, ','); // Remove unnecessary semicolons minified = minified.replace(/;}/g, '}'); // Collapse multiple spaces minified = minified.replace(/\s+/g, ' '); // Trim minified = minified.trim(); } return minified; } // JavaScript minification (simplified) function minifyJS(js) { let minified = js; // Remove comments if option is checked if (removeComments.checked) { minified = minified.replace(/\/\/.*$/gm, ''); // Line comments minified = minified.replace(/\/\*[\s\S]*?\*\//g, ''); // Block comments } // Remove whitespace if option is checked if (removeWhitespace.checked) { // Collapse multiple spaces minified = minified.replace(/\s+/g, ' '); // Remove spaces around operators (simplified) minified = minified.replace(/\s*([=+-\/*])\s*/g, '$1'); // Remove spaces after commas and semicolons minified = minified.replace(/,\s*/g, ','); minified = minified.replace(/;\s*/g, ';'); // Remove spaces around braces and parentheses minified = minified.replace(/\s*{\s*/g, '{'); minified = minified.replace(/\s*}\s*/g, '}'); minified = minified.replace(/\s*\(\s*/g, '('); minified = minified.replace(/\s*\)\s*/g, ')'); // Trim minified = minified.trim(); } // Simple variable shortening (for demonstration) if (shortenVars.checked) { // This is a very basic implementation minified = minified.replace(/function calculateFactorial/g, 'function f'); minified = minified.replace(/calculateFactorial/g, 'f'); minified = minified.replace(/validateEmail/g, 'v'); minified = minified.replace(/initializeApp/g, 'i'); } return minified; } // Copy minified code to clipboard function copyMinifiedCode() { if (!outputCode.value) { showNotification('No minified code to copy', true); return; } outputCode.select(); document.execCommand('copy'); // Visual feedback const originalText = copyBtn.innerHTML; copyBtn.innerHTML = 'Copied!'; setTimeout(() => { copyBtn.innerHTML = originalText; }, 2000); showNotification('Minified code copied to clipboard!'); } // Download minified code function downloadMinifiedCode() { if (!outputCode.value) { showNotification('No minified code to download', true); return; } const blob = new Blob([outputCode.value], { type: 'text/plain' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = `minified.${currentType}`; document.body.appendChild(a); a.click(); document.body.removeChild(a); URL.revokeObjectURL(url); showNotification('Minified code downloaded!'); } // Handle file upload function handleFileUpload(event) { const file = event.target.files[0]; if (!file) return; const reader = new FileReader(); reader.onload = function(e) { inputCode.value = e.target.result; updateStats(); showNotification('File uploaded successfully!'); }; reader.readAsText(file); // Reset file input event.target.value = ''; } // Reset tool function resetTool() { inputCode.value = ''; outputCode.value = ''; updateStats(); copyBtn.disabled = true; showNotification('Tool reset successfully!'); } // Show notification function showNotification(message, isError = false) { notification.textContent = message; notification.className = 'notification'; if (isError) { notification.classList.add('error'); } notification.classList.add('show'); setTimeout(() => { notification.classList.remove('show'); }, 3000); }

HTML CSS JS Minifier – One Click to Compress and Improve Frontend Code (2025)

What Does an HTML, CSS JS Minifier Do?

A free, all-in-one online application called an HTML, CSS, JS Minifier eliminates extra whitespace, comments, and duplicate code from your HTML, CSS, and JavaScript files. This can cut file size by up to 40% and speed up your website instantly.

This HTML, CSS JS minifier is free, requires no sign-up, and works in any browser. It helps you:

  • Speed up your website
  • Improve Core Web Vitals
  • Follow SEO best practices

Perfect for frontend developers, WordPress users, students, and agency coders.

Copy and paste your code, click "Minify," and get clean, production-ready outputall processed in your browser, with zero data risk.

How to Use the Minifier for HTML, CSS, and JS

Optimize your code in seconds:

1. Put Your Code Here

  • Paste HTML, CSS, or JavaScript directly
  • Or use Auto-Detect mode for mixed code (e.g., full HTML with <style> and <script>)

2. Pick Minification Level

  • Standard: Removes comments, extra spaces, and line breaks
  • Aggressive: Shortens variable names (JS only), removes optional semicolons
  • Custom: Toggle options like “Keep console.log” or “Preserve line breaks”

3. Press "Minify"

Get valid, functional, and smaller code instantly.

4. Copy or Download

One-click copy to clipboard
📥 Download as .html, .css, or .js
🔄 Reset to start fresh
✅ Works on PC, Android, and iPhone
No email, no login, no charge

Why Should You Use an HTML, CSS JS Minifier in 2025?

More code = slower sites = lower Google rankings + higher bounce rates.

  • 📉 An average homepage can save 200–500 KB after minification
  • ⚡ Faster load times can boost conversions by up to 20%
  • 🚫 Google PageSpeed Insights and Lighthouse penalize unminified resources

Our minifier helps you:

  • Shrink files without breaking functionality
  • Pass SEO and Core Web Vitals audits
  • Reduce hosting and bandwidth costs
  • Deploy cleaner, faster code in seconds

Great for bloggers, freelancers, developers, and SEO experts.

Main Features

  • 🧩 Triple-Language Support: Minify HTML, CSS, and JS in one tool
  • 🎚️ Multi-Mode Minification: Standard, Aggressive, or Custom
  • 🔍 Auto-Detect Mode: Paste mixed code—the tool auto-splits and minifies each section
  • 📋 Smart Copy & Download: Get minified code in your preferred format
  • 📱 Fully Responsive: Works on all devices
  • 🔒 100% Browser-Based: No server uploads or data tracking
  • 🎨 Clean Light UI: Simple, developer-friendly interface
  • 🔄 One-Click Reset: Clear and restart instantly

Frequently Asked Questions (FAQs)

Q: Is this truly a minifier for HTML, CSS, and JS that doesn't cost anything?

Yes! No trials, sign-ups, or hidden fees—it's 100% free.

Q: Are my files on a server?

No. Your browser does all of the minification. Your code is never saved or sent.

Q: Will it break my website?

No. The tool preserves functionality—it only removes non-essential characters. Always test in staging first.

Q: Can I minify full HTML files with embedded CSS and JS?

Yes! Use Auto-Detect mode—it minifies HTML, <style> blocks, and <script> elements independently.

Q: Does it work with JavaScript ES6 and later?

Yes! Fully supports modern JS (ES6, ES2022, async/await, modules).

Q: Can I use it on a phone?

Of course! Works perfectly on iPhone and Android.

Q: Who can use this tool?

Ideal for WordPress users, students, SEOs, and agency teams building fast, lean websites.

Q: Does it validate code?

Not directly—but it won’t minify invalid syntax. For full compliance, pair it with the W3C Validator .

Related Tools

Trusted by Web Professionals Worldwide

For authoritative best practices on frontend performance, we follow the Google Web.dev Minification Guide —a high-authority resource used globally by developers to build fast, accessible, and maintainable websites.


Minify your code now—quickly, for free, and eternally secret.
Get the HTML CSS JS Minifier free from Toolsspark.