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Free developer tool

JavaScript Minifier

Compress JavaScript instantly to reduce file size, speed up your pages, and optimize for production, right in your browser. Paste your code on the left, click Minify, and copy the compressed output on the right.

Working field

Paste your JavaScript code and minify it.

JavaScript Code

Result

Your minified output appears here.

Your minified output will show here once you paste some code and click Minify.

This tool is best for shrinking scripts before deployment to boost page speed and performance.

Free Online JavaScript Minifier

Compress your JavaScript instantly to improve performance and reduce file size while keeping the logic intact. This tool keeps the workflow simple: paste and minify on the left, supporting content below, and the sidebar on the left for popular and related tools.

Reduce file size

Strip unnecessary characters to cut your code size by 40-60% in most cases.

Faster loading

Smaller files load quicker, improving page speed and your SEO scores.

Remove comments

Comments and extra whitespace are stripped out automatically for you.

Private by design

Everything runs in your browser, so your code never leaves your device.

How it works

  1. Paste your JavaScript code into the input on the left.
  2. Click Minify to compress the code in a single step.
  3. Review the minified output in the result panel on the right.
  4. Use Copy Output to grab the result, or Reset to start over.

Best practices

  • Minify your final code right before deploying to production.
  • Keep a readable copy of your source for future edits.
  • Test the minified output in a compiler to confirm it runs.
  • Minify large libraries to save bandwidth on your server.
  • Pair minification with caching for the best page speed.
  • Unminify compressed code first when you need to debug it.

Frequently asked questions

What is JavaScript minification?

Minification removes unnecessary characters like spaces, comments, and line breaks from code without changing its functionality.

Will minified code still work?

Yes. Minified code functions identically to the original. Only non-essential formatting is removed.

How much does minification reduce file size?

Typically 40-60%, depending on your code structure and how many comments it contains.

Can I reverse minification?

Partially. Use our JS Unminifier to restore readable formatting, or rely on source maps during development.

Does minification affect page SEO?

Indirectly, yes. Faster load times improve Core Web Vitals, which benefits your SEO rankings.

Is my source code safe and private?

Absolutely. All processing happens locally in your browser. We never store or transmit your code.

Does this tool support ES6+ syntax?

Yes. The minifier is compatible with modern features like arrow functions, classes, and async/await.

Will minification change my variable names?

No. This version focuses on whitespace and comment removal, so your logic stays 100% safe to run.

Can I minify jQuery or other libraries?

Yes. You can minify any valid JavaScript library file to save bandwidth on your hosting server.

Does this tool work on mobile devices?

Yes. It is fully responsive, so you can minify JavaScript on your smartphone just as easily as on a desktop.

Need more developer tools? Make compressed code readable again with the JS Unminifier tool, run and test your snippets with the JavaScript Compiler tool.