JavaScript Minifier

The JavaScript Minifier removes whitespace, comments, and unnecessary characters from your JS code to reduce file size and improve page load speed. It runs entirely in your browser with no uploads to any server, making it safe for proprietary or sensitive code. Built for front-end developers, full-stack engineers, and anyone shipping JS to production.

Configuration

Content

Tool Title

Tool Subtitle

Sample Input JavaScript

Minification Options

Strip CommentsRemove WhitespaceMangle Variable NamesPreserve License Comments

Output Format

Design

Editor Theme

Accent Color

Button Border Radius (px)

Layout

Editor Panel Height

Panel Layout

Show Size Savings StatsShow Copy to Clipboard ButtonShow Download Button

How to Use

1. Paste your JavaScript code into the input field and choose your minification options (strip comments, mangle variables, etc.). 2. Adjust the output settings such as line break handling and variable name mangling to match your project needs. 3. Click 'Minify Code' to see the minified output instantly along with size savings stats. 4. Copy the minified code to your clipboard or download it as a .min.js file ready to deploy.

Why Use This Tool?

Manually removing whitespace and comments from JS files is tedious and error-prone, especially across large codebases. This tool handles it instantly in the browser with zero dependencies, no npm installs, and no build pipeline required. You can shave 30 to 60 percent off typical JS file sizes in seconds, directly improving Time to Interactive scores.

Frequently Asked Questions

What is the JavaScript Minifier?

The JavaScript Minifier is a browser-based tool that compresses JavaScript code by stripping comments, whitespace, and optional variable names, reducing file size without changing how the code executes.

Will minifying my JavaScript break my code?

Standard minification (whitespace and comment removal) is completely safe and will never break valid JavaScript. Variable name mangling is more aggressive and can occasionally cause issues if your code relies on function.name properties, eval, or certain dynamic patterns. If you see errors after mangling, disable that option and re-minify. Always test minified output in a staging environment before pushing to production.

Is it free?

Yes, the JavaScript Minifier is completely free with no signup required. Built by the CanvasBuilder.co team.