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JavaScript Minifier Online – Minify JS Free with Terser
Minify JavaScript online using Terser. Remove comments, compress expressions, and mangle variable names to reduce JS file size. 100% browser-based — your code stays private.
JavaScript Minifier
Ready to minify
Paste your JavaScript on the left, then click Minify JavaScript
What is JavaScript Minifier?
Compress JavaScript files using Terser, the industry-standard JS minifier. Remove comments, fold constants, eliminate dead code, and optionally mangle variable names for maximum reduction. Compare original vs. minified size and download the result instantly. Everything runs in your browser — nothing is uploaded.
JavaScript Minifier Features
Powered by Terser
Uses the same engine as Webpack and Vite for production-grade JavaScript minification.
Name Mangling
Optionally shorten variable and function names to single letters for maximum compression.
Size Comparison
See original vs. minified byte count and percentage saved after each run.
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JavaScript Minifier FAQ
Yes — everything runs in your browser using Terser. Your code is never sent to any server.
Compress simplifies expressions and removes dead code. Mangle shortens variable and function names to single characters. Both reduce file size; mangling is more aggressive.
Yes — Terser supports modern JavaScript including ES2022+ syntax. For JSX, transform to plain JS first (e.g., with Babel) before minifying.
Typical savings are 40–70% with compression and mangling enabled. Well-commented, heavily formatted code sees the biggest reductions.