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JavaScript Minifier Online

Minify JavaScript by shortening variable names and removing unnecessary code — reducing file size safely.

Runs entirely in your browser — your files are never uploaded to a server.

Last updated

This tool processes your input entirely in your browser. Nothing is sent to our servers.

How It Works

1. Choose Your File

Drag & drop or select the file you want to work with.

2. Processed in Your Browser

Everything happens locally on your device — your file is never uploaded anywhere.

3. Download Your Result

Get your finished file instantly, ready to save or share.

About JavaScript Minifier Online

Minifying JavaScript removes unnecessary whitespace and comments, and often shortens variable names internally, reducing file size for faster page loading — the code’s actual behavior is unchanged, only its size and readability.

Like CSS minification, this matters for production deployment specifically, where reduced file size directly improves page load speed, especially on slower connections.

Keep your original, readable source file for ongoing development — minified JavaScript is difficult to read or debug directly, so it’s meant as a final deployment step, not a working format.

Frequently Asked Questions

How to minify JavaScript?

Paste your JavaScript into the box and click Minify JavaScript. The tool removes whitespace and comments, shortens local variable names and shows the original and minified size in bytes. Copy the result and test it before replacing your original code.

How to minify a JavaScript file?

Open the .js file in an editor, copy its contents and paste them into the tool. Save the output as a new file, for example script.min.js, and keep the original. The tool takes pasted text only, so you cannot upload a file.

How to compress JavaScript?

Minifying is the usual way: it shrinks the code itself, and this tool shows the byte saving. Servers can also gzip or Brotli compress files on delivery, which is separate and configured on your host. The two methods work well together.

Will minifying break my JavaScript?

Usually not, since it runs Terser with default settings and reports syntax errors instead of output. Those defaults shorten local variable names and strip comments, so code relying on function names or string-based lookups can misbehave. Test the minified code, and keep your original.

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