JavaScript Minifier
Compress and minify JavaScript code online instantly. Free tool to reduce JS file size and improve website performance.
Original JavaScript
Minified JavaScript
Minified JS will appear here...
Free JavaScript Minifier Tool
Reduce your JavaScript payload size and improve load times. This basic client-side minifier strips comments, line breaks, and unnecessary spaces from your JS files instantly — a quick way to minify js online or compress js without a build pipeline. Note: For complex production code, we recommend using a full AST-based minifier like Terser.
How to Use It
Paste your JavaScript into the input box and click minify to instantly strip comments and unnecessary whitespace, producing a compact output ready to copy. This works as a fast javascript minify / javascript compress tool with no sign-up and no software to install — everything runs locally in your browser.
Example
Multi-line, commented JavaScript with extra whitespace minifies down to a compact single-line output — smaller file size, same behavior.
Common Use Cases
- Quickly shrinking a small script for a prototype or personal project.
- Removing comments and whitespace before sharing or embedding a snippet.
- Minimizing JS pasted into a <script> tag to trim page weight without a build step.
- Comparing original vs. minified byte size before deciding whether to bother compressing further.
FAQs
Is this safe for production code?
For complex production codebases, a full AST-based minifier like Terser or esbuild is safer and more thorough — this tool is best for quick, simple minification needs.
Can I minify js online without installing anything?
Yes — paste your JavaScript into the input box and click Minify JS. Everything runs in your browser, so there's nothing to install and no build tooling required.
What does this JavaScript minify / compress js tool actually remove?
It strips comments (both // and /* */ styles), collapses extra whitespace and line breaks, and removes unnecessary spaces around operators and punctuation — reducing file size without changing behavior for typical scripts.
Does minimizing JS change how my code runs?
It shouldn't — minifying only removes comments and formatting whitespace, not logic. However, this is a basic regex-based minifier, not a full parser, so always test minified output before deploying it, especially for complex code.