JavaScript Minifier Online
Minify your JavaScript code instantly in the browser. This tool strips whitespace, removes comments, and compresses your JS files — all client-side with nothing sent to a server.
Code Minifier & Beautifier
Minify or beautify JavaScript, CSS, and HTML code instantly. No data leaves your browser.
About Code Minification & Beautification
Beautify reformats your code with proper indentation, line breaks, and spacing for maximum readability. Great for reading minified production code or cleaning up messy formatting.
Minify removes all unnecessary whitespace, comments, and formatting to produce the smallest possible output. Minified code loads faster and uses less bandwidth — essential for production deployments.
JavaScript: Handles string literals (single, double, template), comments (single-line and multi-line), regex literals, and all modern syntax. Preserves semicolons and statement structure.
CSS: Handles selectors, declarations, at-rules (@media, @keyframes), comments, and nested structures. Collapses whitespace around delimiters for maximum compression.
HTML: Handles all standard tags, void elements (br, img, input, etc.), comments, DOCTYPE declarations, and embedded script/style content. Preserves content within pre and textarea tags.
What is JavaScript minification?
JavaScript minification is the process of removing unnecessary characters from source code without changing its functionality. This includes whitespace, line breaks, comments, and optionally shortening variable names. Minified JavaScript loads faster because smaller files transfer more quickly over the network, directly improving page load times and Core Web Vitals scores.
Common use cases
JavaScript minification is a standard step in production build pipelines. Frontend developers minify JS bundles before deploying to reduce bandwidth usage and improve load performance. It is also useful when embedding inline scripts, optimizing third-party widgets, or preparing code for CDN distribution where every kilobyte matters.
Frequently Asked Questions
Does minifying JavaScript break my code?
No. Minification only removes non-functional characters like whitespace and comments. Your code behaves identically after minification. Issues only arise if source code relies on formatting, which is extremely rare.
How much smaller does JavaScript get after minification?
Typical JavaScript files shrink by 20-60% after minification, depending on how much whitespace and commenting exists in the original source. Combined with gzip compression, total savings can exceed 80%.