# JavaScript Minifier Compress JavaScript code > Canonical page: https://elysiatools.com/en/tools/javascript-minifier - **Category:** Development - **Keywords:** javascript, minifier, compress, minify, uglify, optimize ## Overview The JavaScript Minifier is a high-performance utility designed to reduce the file size of your scripts by removing unnecessary whitespace, comments, and shortening variable names. By optimizing your code, you can significantly improve website load times and reduce bandwidth consumption for your production environment. ## Inputs - **JavaScript Code** (textarea): Enter JavaScript code to minify... - **Compression Level** (select) - **Mangle Names** (checkbox) - **Preserve Comments** (checkbox) - **ECMA Version** (select) ## When to use - Preparing JavaScript files for production deployment to improve page speed. - Reducing the overall payload size of web applications to save server bandwidth. - Obfuscating code slightly by mangling variable names to make source code harder to read. ## How it works - Paste your source JavaScript code into the input area. - Select your preferred compression level and target ECMA version. - Toggle options like 'Mangle Names' or 'Preserve Comments' to customize the output. - Click the process button to generate the minified, production-ready code. ## Use cases - Optimizing front-end assets for faster website performance and better SEO rankings. - Preparing library files for distribution via CDN to ensure minimal download times. - Cleaning up generated code from build tools before final deployment. ## Frequently asked questions ### What does 'Mangle Names' do? It shortens local variable and function names to single characters, which significantly reduces file size. ### Can I keep my code comments? Yes, enable the 'Preserve Comments' option if you need to retain specific license headers or documentation. ### Which ECMA version should I choose? Select the version that matches your target browser support; 2020 is a common standard for modern web applications. ### Is this tool safe for large scripts? Yes, the minifier is designed to handle complex JavaScript files efficiently while maintaining code logic. ### Does minification change how my code runs? 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