JavaScript Minifier
Minify JavaScript by removing comments, whitespace, and unnecessary characters to reduce file size.
About JavaScript Minifier
JavaScript minification removes whitespace, comments, and unused symbols from your code, producing a smaller file that downloads faster and parses quicker. While modern build tools handle this automatically, there are plenty of situations where you need to compress a single script without setting up a project — embedded snippets, third-party widgets, analytics tags, or quick experiments. This minifier handles those cases entirely in your browser.
It is safe with modern syntax and preserves all functional behaviour while stripping only the bytes that have no effect at runtime. Common workflows include shipping a small standalone script to production, preparing code for inline embedding inside HTML, and quickly measuring how much your code shrinks after compression.
How to Use
Paste your JavaScript code into the input box.
Choose your minification options.
Click 'Minify' to process your JavaScript.
Copy the minified result. The tool shows file size savings.
Frequently Asked Questions
What does JS minification do?
JS minification removes comments, extra whitespace, and newlines without changing your code's behavior. This makes the file smaller and faster to download.
Is this a full production minifier?
This tool performs basic minification (comment/whitespace removal). For production builds, tools like Terser or esbuild also do variable renaming and dead code elimination. This tool is great for quick minification and understanding file size savings.
Will minification break my JavaScript?
Basic minification (removing comments and whitespace) is safe. However, always test your minified code. Some edge cases with template literals or regex patterns may need manual review.
Is my code sent to any server?
No. All minification happens entirely in your browser. Your code never leaves your device.
JavaScript Minifier Online: Minify JS to Reduce Bundle Size
JavaScript bundles dominate page weight on modern sites. Minifying JS is essential for performance — here's how it works and what to expect.
Read the full guide