Free Online Code Minifier & Beautifier
Minify and beautify HTML, CSS, and JavaScript instantly in your browser. No signup, no server — your code stays on your device.
What you get
100% Private
Your code never leaves your browser. All minification and beautification runs locally on your device — nothing is uploaded.
Instant Results
No server round trips, no waiting. Process thousands of lines in milliseconds with client-side Terser for JS and custom parsers for HTML and CSS.
HTML, CSS & JavaScript
Full support for all three web languages with accurate minification, inline style/script handling, and intelligent beautification.
Size Statistics
See exactly how much you've saved — byte-level size comparisons, line counts, and percentage reduction after every operation.
File Upload & Download
Drag and drop .html, .css, .js, .json, or .txt files directly onto the editor. Download processed output as a named .min file.
Completely Free
No account, no limits, no ads interrupting your workflow. Just a fast, focused tool that works every time.
How it works
Three steps, no friction.
Paste or upload your code
Type directly into the editor, paste from your clipboard, or drag and drop a file. HTML, CSS, and JavaScript are auto-detected.
Click Minify or Beautify
Hit the button (or use Ctrl+Shift+M / Ctrl+Shift+B). Processing happens instantly — no loading spinner, no server call.
Copy or download the result
Copy the output to clipboard or download it as a file. Minified files are named with a .min suffix automatically.
Language-specific minifiers
Pre-configured for each language.
HTML Minifier →
Remove whitespace, comments, and redundant attributes from HTML documents including inline CSS and JS.
CSS Minifier →
Compress stylesheets by stripping comments, collapsing whitespace, and optimising selectors.
JavaScript Minifier →
Production-grade JS compression via Terser — dead code removal, variable mangling, and more.
Frequently asked questions
What does minification do to my code?
Minification removes unnecessary characters — whitespace, comments, newlines — without changing how the code runs. The result is a smaller file that loads faster in browsers.
Is my code safe? Does it get sent to a server?
Your code never leaves your device. Everything runs locally in your browser. No data is uploaded, stored, or logged anywhere.
How much can minification reduce file size?
Typical savings are 20–50% for CSS, 30–60% for JavaScript, and 15–30% for HTML. Well-commented source files with generous whitespace see the largest reductions.
What's the difference between minify and beautify?
Minify compresses code for production — smallest possible file size. Beautify formats code for readability — useful for debugging minified third-party code or understanding unfamiliar files.
Does minification change how my code works?
No. Minification only removes redundant characters. Logic, selectors, and functionality stay identical. JavaScript uses Terser, which safely handles variable renaming.
What file types are supported?
MinifyTools supports .html, .htm, .css, .js, .json, and .txt files up to 1 MB. Language is auto-detected, or use the dedicated HTML, CSS, or JavaScript minifier pages.