JavaScript Minifier | Compress & Optimize JS
Minify JavaScript by removing whitespace and comments to shrink bundle size without changing behavior. Supports modern ES features (modules, async/await, classes). Processing is 100% client-side.
How to Use This Tool
- 1
Paste or drop your JavaScript into the input.
- 2
Use Live mode for instant results or Manual mode to click Minify.
- 3
Review bytes saved and compression rate.
- 4
Copy or download the minified file and verify in QA.
Use Cases & Examples
Production Builds
Ship smaller bundles for faster startup and lower bandwidth.
CDN Distribution
Serve compact assets from a CDN and improve global performance.
Libraries & npm Packages
Publish .min.js along with readable sources for consumers.
Mobile Web & PWAs
Reduce download and parse time on slow networks and devices.
How JavaScript Minification Works
Parses the source and removes non-semantic characters (spaces, newlines, comments) while preserving program semantics.
Keeps ES6+ constructs (modules, classes, async/await, template literals) intact; avoids identifier renaming/obfuscation.
Combines well with Gzip/Brotli and code splitting to improve startup and Time to Interactive.
Frequently Asked Questions
Q.Will minifying JavaScript break my code?
A. Output should behave the same. If you rely on special comments (e.g., license/@preserve) or whitespace-sensitive logic, test in staging before release.
Q.Should I minify in development?
A. Keep readable code during development and minify for production. Automate it in CI/CD for consistency.
Q.Are source maps generated?
A. This tool focuses on quick, safe minification. Generate source maps with build tools such as Terser, esbuild, or webpack/Vite.
Q.What optimizations are applied?
A. It strips non-functional characters (whitespace/comments) and conservative formatting only—no risky renaming or obfuscation.
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