A small function
function add(a, b) {
// returns the sum
return a + b;
}function add(a,b){return a+b}JavaScript Minifier
Minify JavaScript to reduce file size, using the same engine as production build tools.
Output
The result will appear here.
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About this tool
Minifying JavaScript strips everything a parser doesn't need — comments, whitespace, redundant syntax — without changing what the code does. It matters most for anything shipped to a browser: every byte downloaded before the page becomes interactive.
This tool runs Terser, the minifier behind most production JavaScript bundlers, entirely in your browser via WebAssembly-free pure JS — so it applies the same real optimizations a build tool would, not a naive regex-based whitespace stripper.
How to use it
- Paste JavaScript — a single function, a whole file, or a bundle.
- Press Minify. Variable and function names are left untouched (this is size reduction, not obfuscation), so the output stays debuggable if you ever need to read it.
- Copy the result or check the before/after size in the stats line.
Examples
Common problems
- Minifying reports a syntax error on code that runs fine in my browser.
- Terser parses standard ECMAScript; framework-specific syntax (JSX, TypeScript types) needs to be compiled to plain JavaScript first — paste the compiled output, not the source file.