JS/CSS Minifier

Minify JavaScript and CSS code by removing whitespace and applying minify rules.

Category: Dev Tools

When to use?

Use it to reduce the size of inline scripts or embedded code, or to minify a simple snippet before deployment.

How to use

  • Enter JS or CSS code.
  • Press minify to remove whitespace and unneeded characters.
  • Copy the minified code.

Input Explanation

Enter the JavaScript or CSS code to minify in the text area.

Calculation Basis

It uses regex and string manipulation to find and remove unneeded line breaks, multiple spaces, tabs, and comments (single-line //, multi-line /* */) to minimize byte size.

Usage Examples

  • Reduce size before deploy - Reduce the size of short snippets or embedded code.
  • Quick pre-deploy check - Check inputs and output to reduce errors before dev/ops work.
  • Aid docs/reviews - Copy the result into dev docs, issues, or review comments.

Examples

  • A 5KB JS file with whitespace and comments → a one-line 2KB minified file
  • A CSS file before deploy → whitespace/line breaks removed to under half the size

Cautions

  • Generated output is for reference; test carefully before production use.
  • Minification runs only in the browser and is not sent to a server.

Guides

What minify is

It removes characters unneeded for execution — whitespace, line breaks, comments — to reduce file size. Minifying JS/CSS cuts network transfer and speeds page loads.

Difference from build tools

Bundlers like webpack, Vite, and Rollup do more advanced minify optimization. This tool suits quick manual checks or small projects.

FAQ

Is it an obfuscation tool?

The main goal is size reduction; JavaScript also applies mangling and compression.

Is the code sent out?

No. Minification runs only in the browser and is not sent to a server.

Does it minify JS and CSS together?

It applies minify rules suited to each, so choose the code type to minify.

Does minifying change behavior?

It removes only whitespace and line breaks, so behavior stays the same. Still, test the result before applying.

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