How to Use
- 1.
Paste JavaScript code into the input editor.
- 2.
Choose whether to remove safe JavaScript comments from the output.
- 3.
Click Minify JS to compress whitespace, line breaks, and punctuation spacing.
- 4.
Review original size, minified size, saved bytes, savings percentage, and line count.
- 5.
Copy the compact JavaScript or download it as a .js file.
- 6.
Test complex scripts, framework bundles, or production-critical code before deployment.
Features
JavaScript minifier and compressor
Optional safe comment removal
Preserves strings and template literals
Handles common regex literals
Keeps important license comments
Original and minified size stats
Copy minified JavaScript to clipboard
Download output as a .js file
Frequently Asked Questions
What is a JavaScript minifier?+
A JavaScript minifier removes unnecessary spaces, line breaks, and optional comments from JS code so the output becomes smaller while normal behavior stays the same.
How do I minify JavaScript online?+
Paste your JS code into the input box, choose whether to remove comments, click Minify JS, then copy or download the compressed output.
Can I compress JavaScript code online for free?+
Yes. This free JS compressor runs in your browser and lets you copy minified output or download a compact .js file.
Does this JavaScript compressor remove comments?+
Yes, when comment removal is enabled. Important license comments that start with an exclamation mark are preserved.
Will minified JavaScript work the same?+
For normal scripts, it should work the same. Review and test output before using it with complex bundles, framework output, or unusual syntax.
Is my JavaScript uploaded to WebToolsEdge?+
No. Minification, stats, copying, and downloading all happen locally in your browser.
About this tool
Free JS Minifier
Use this free JS Minifier Online to compress JavaScript code directly in your browser. Paste JavaScript from a website, static project, landing page, small app, widget, tracking snippet, or development file and create compact JS that is easier to store, embed, or test. A JavaScript minifier removes unnecessary whitespace, line breaks, and optional comments while keeping the code's normal behavior intact. This can reduce file size, make copied snippets easier to share, and help prepare small scripts before publishing. Developers usually minify JavaScript with a build tool, but a browser-based JavaScript compressor is useful when you need to minify JS online quickly, clean a one-off snippet, or compare original and compressed file size without setting up a project. This tool is designed for practical everyday use. It preserves quoted strings, template literals, and common regular expression literals while compressing whitespace around operators, brackets, braces, commas, and semicolons. It also keeps important license comments that start with an exclamation mark when comment removal is enabled. For normal scripts and small files, the output should behave the same after minification. Use this tool when you need to compress JavaScript code online for a static page, reduce a small script before embedding it, prepare a code sample for documentation, or create a compact test file. If you are working with framework bundles, modern syntax edge cases, unusual regex patterns, or production-critical code, review and test the output before deployment. For large applications, a full build pipeline with a parser-based minifier is still the safer choice. All processing happens locally in your browser. Your JavaScript is not uploaded to WebToolsEdge. Copy the minified output or download it as a .js file when you are ready.
Working on front-end files? Compress stylesheets with the CSS Minifier, minify page markup with the HTML Minifier, or validate configuration snippets with the JSON Formatter & Validator. More code utilities are grouped in Developer Tools.