JavaScript Minifier
Minify JavaScript code by removing comments, whitespace, and newlines. See size savings with before/after comparison.
Options
0 bytes
Paste JavaScript above to see the minified output instantly.
How to Use JavaScript Minifier
- 1Paste your JavaScript code.
- 2See the minified output instantly.
- 3Toggle comment and whitespace removal.
- 4Copy the minified code.
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Frequently Asked Questions
What is JavaScript minification?▾
JavaScript minification is the process of removing all unnecessary characters from source code without changing its functionality. This includes removing comments, whitespace, newlines, and other characters that are only needed for human readability. The result is a smaller file that loads faster in the browser.
What is the difference between minification and compression?▾
Minification permanently removes unnecessary characters from the source code itself — the output is still valid, readable JavaScript. Compression (like gzip or Brotli) is a reversible encoding applied by a web server to reduce the bytes transferred over the network; the browser decompresses before executing. Both techniques complement each other and are typically used together for maximum savings.
Why should I minify JavaScript?▾
Minifying JavaScript reduces file size, which speeds up page load times, lowers bandwidth usage, and improves Core Web Vitals scores. Smaller scripts parse and execute faster, directly improving user experience and SEO rankings. Even modest reductions matter on mobile connections.
What are common JavaScript minifiers used in production?▾
Popular minifiers include Terser (the most widely used, supports ES2020+), esbuild (extremely fast, written in Go), SWC (Rust-based, used by Next.js), and the older UglifyJS. These tools also perform advanced optimizations like variable renaming, dead code elimination, and tree shaking beyond basic whitespace removal.
What are source maps and why do I need them?▾
Source maps are separate files (typically `.map`) that map each position in your minified output back to the original source file and line number. They allow browser developer tools to display the original, readable code when debugging — even though the browser is running minified code. Build tools like Webpack, Rollup, and esbuild can generate source maps automatically.