JavaScript Minifier

Minify JavaScript online with Terser: mangling, dead code removal, and size savings shown, all in your browser

Mangle variable names

JavaScript Input

Minified JS

JavaScript Minifier Tips

Powered by Terser - the same engine behind webpack, Vite and Rollup production builds.
Mangling renames local variables to short names; disable it if you need readable stack traces.
Dead code like unused functions is dropped automatically by the compressor.
Minified ES modules still need a bundler for import/export resolution - minify bundles, not modules.

Professional JavaScript Minifier Processing Features

Everything you need to work with JavaScript Minifier data efficiently and professionally

Terser Engine

The same battle-tested minifier that powers production builds of webpack and Vite.

Clean Output

Comments stripped, whitespace collapsed, code restructured for minimal size.

Dead Code Removal

Unused variables, unreachable branches and redundant logic disappear automatically.

Mangle Control

Toggle variable mangling with one checkbox - readable when you need it, tiny when you ship it.

Size Report

Bytes before and after, plus the exact percentage saved, on every run.

Private by Design

Your source code stays in the browser tab. Nothing is uploaded, ever.

How It Works

Simple steps to process your JavaScript Minifier like a pro

Paste Your JavaScript

Copy a function, module bundle, or script into the input area.

Choose Options

Keep mangling on for smallest size, or turn it off for debuggable output.

Click Minify

Terser compresses the code in your browser and reports the savings.

Copy the Output

Copy the minified script into your build, CDN, or production page.

Professional JavaScript Minifier Formatter & Validator

JavaScript Minifier processing runs entirely in your browser — no uploads, no accounts, no limits.

Built by Experts

The JavaScript Minifier formatting engine runs locally in your browser using established parsers and standard algorithms. Nothing is hidden — open your browser dev tools and watch it work.

Key Technical Features:

• Real Terser engine (the standard for JS minification) running fully in your browser
• Compressor removes dead code, unreachable branches and redundant logic
• Optional mangling shortens variable and function names
• Byte-accurate size report with before/after comparison and savings percentage
• Engine loads lazily from CDN - the page stays fast until you click Minify

Trusted & Secure

Your data stays in your browser: nothing is uploaded, stored, or logged. Close the tab and it is gone.

Security & Privacy:

• 100% client-side minification - your source code never leaves the browser
• No tracking, cookies or data logging
• HTTPS encryption for secure connections
• Private or proprietary code stays on your device
• GDPR and CCPA compliant approach

Why Professionals Choose EZ Formatter

100%

Client-side processing

Data sent to servers

Tools in the workbench

Your data stays in your browser

Frequently Asked Questions

Common questions about Js Minifier formatting answered

Yes, completely free with no registration. All minification happens locally in your browser.

Terser - the industry-standard minifier used by webpack, Vite, Rollup and many other bundlers for their production builds.

Mangling renames local variables and functions to 1-2 character names for extra savings. Enable it for production; disable it when you need readable stack traces or debug the output.

It can compress the syntax, but module specifiers are left as-is. Bundle your code first (e.g. with a bundler), then minify the bundle for the best result.

Typical well-commented, readable source shrinks 40-60% with mangling enabled; already-compact code shrinks less. The size report shows the exact savings.