JavaScript Minifier

A JavaScript Minifier takes your readable, well-formatted JavaScript source code and compresses it into the smallest possible form without changing its behavior. It strips out whitespace, line breaks, code comments, and can shorten variable names — producing a compact output that browsers can parse and execute just as effectively as the original.

For developers, minification is a critical step in any production build pipeline. Smaller JavaScript files mean faster network transfers, quicker parse times, and better Core Web Vitals scores. Whether you are shipping a single script or a complex web application, minifying your JavaScript directly reduces bundle size and improves the experience for every user loading your page.

Using the tool is straightforward: paste your JavaScript source code into the input panel and the minified output is generated instantly. The input can be anything from a small utility function to a full module — formatted code with indentation, multiline comments, and descriptive variable names. The output will be a single compact line (or very few lines) with all unnecessary characters removed.

The minifier removes single-line comments (//), block comments (/* */), unnecessary whitespace between tokens, and redundant semicolons where safe to do so. The logical structure and execution order of your code remain completely intact — only characters that are irrelevant to the JavaScript engine are eliminated.

One edge case to be aware of: if your code relies on specific whitespace formatting inside string literals or template literals, those strings are preserved as-is. Similarly, code that uses eval() or dynamically constructs code strings may behave unexpectedly after aggressive minification, so always test minified output before deploying to production. For source map support or advanced dead-code elimination, consider integrating a full build tool like Terser or esbuild into your workflow.