UglifyJS2, used by the jQuery project.
Answer from Andreas Hofmann on Stack Overflow Top answer 1 of 9
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UglifyJS2, used by the jQuery project.
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Active
- Closure Compiler
- UglifyJS2
Deprecated
- YUI Compressor
- UglifyJS
Google Closure Compiler generally achieves smaller files than YUI Compressor, particularly if you use the advanced mode, which looks worryingly meddlesome to me but has worked well on the one project I've used it on:
Several big projects use UglifyJS, and I've been very impressed with it since switching.
Toptal
toptal.com › developers › javascript-minifier
JavaScript Minifier & Compressor | Toptal®
Use our JavaScript Minifier & Compressor tool to reduce JavaScript code size and make your website load faster. Get started for free now.
Videos
What is JavaScript Minification?
Minification, or minimization, of JavaScript source code is the process removing all characters that aren't required for proper execution. These unnecessary characters usually include formatting characters, like: whitespaces, linebreak characters, comments, and in some cases block delimeters and end-of-line characters. After minification is applied, JS code is supposed to keep its functionality.
minify-js.com
minify-js.com
Minify JS Online. JavaScript Minification tool that works in browser.
How does JavaScript Minification work?
Minification process is performed by a software or utility that analyzes and rewrites source code to reduce its size. Usually, minification process includes removal of whitespaces, shortening of variable names, and verbose functions replacement. Minification is performed on the server side and only when the source file is changed.
minify-js.com
minify-js.com
Minify JS Online. JavaScript Minification tool that works in browser.
Why is Minification used?
Minification allows to reduce JavaScript file size that has a positive impact on load times and bandwidth usage. As a result, site speed and accessibility is higher compared to sites that don't use minification. Other words, minification tangibly improves user experience.
minify-js.com
minify-js.com
Minify JS Online. JavaScript Minification tool that works in browser.
OneNine
onenine.com › home › web design › web management › visual branding
10 JavaScript Minification Tools for Faster Websites - OneNine
On the other hand, web-based tools like Minifier.org or JSCompress provide quick and easy solutions for smaller tasks [1][2]. Next, let’s dive into the FAQ section to address common questions about JavaScript minification.
GitHub
github.com › privatenumber › minification-benchmarks
GitHub - privatenumber/minification-benchmarks: 🏃♂️🏃♀️🏃 JS minification benchmarks: babel-minify, esbuild, terser, uglify-js, swc, google closure compiler, tdewolff/minify, oxc-minify
🏃♂️🏃♀️🏃 JS minification benchmarks: babel-minify, esbuild, terser, uglify-js, swc, google closure compiler, tdewolff/minify, oxc-minify - privatenumber/minification-benchmarks
Author privatenumber
DEV Community
dev.to › codeitbro › 10-best-javascript-minifier-tools-to-boost-website-speed-1jk1
10 Best JavaScript Minifier Tools to Boost Website Speed - DEV Community
January 3, 2026 - YUI Compressor has been a staple for both JavaScript and CSS minification. While testing, I noticed it works best with older JavaScript versions.
Thisisnovos
thisisnovos.com › blog › 10-best-javascript-minification-tools
The 10 Best JavaScript Minification Tools | NOVOS
The size of your scripts can be shrunk down, thus relying on your program style. JS Compress effortlessly minifies your JavaScript files by reducing file size by almost 30%-90%. In addition, it removes whitespace characters and comments.
Minify JS
minify-js.com
Minify JS Online. JavaScript Minification tool that works in browser. | Minify JS Online
Pick a library source to load: ... Minify-JS.com is an online tool that allows you to reduce the size of JavaScript code up to 80%. The minify js tool uses the Terser utility that is compatible with the ES6+ standard. Minify-JS.code also includes helpful resources, best ...
Minifier
minifier.org
Minify JS / CSS - JavaScript and CSS Minifier / Compressor
Minify JS and CSS using this online javascript / css compressor. You can paste .js or .css file, or just plain javascript or CSS code. This JS and CSS minifier removes whitespace, strips comments, combines files, and optimizes/shortens a few common programming patterns.
Kinsta®
kinsta.com › home › resource center › blog › javascript tutorials › how to minify javascript — recommended tools and methods
How to minify JavaScript — Recommended tools and methods
July 31, 2024 - First, you’ll copy and paste your JavaScript source code or upload the source code file on the tool. Then, you’ll optimize the minification tool’s settings to get a specific requirement-based output if options are available. Finally, you’ll take that minified file and use it on the website instead of the original, expanded code (though you should keep the original source code file in safekeeping, just in case). Here are 5 of the best online JavaScript Minification tools that can help you enrich your web performance.
Jscompress
jscompress.com
JSCompress - The JavaScript Compression Tool
JSCompress.com is an online JavaScript compressor that allows you to compress and minify all of your JS files by up to 80% of their original size.
Google
developers.google.com › insights › minify resources (html, css, and javascript)
Minify Resources (HTML, CSS, and JavaScript) | PageSpeed Insights | Google for Developers
To minify JavaScript, try UglifyJS. The Closure Compiler is also very effective. You can create a build process that uses these tools to minify and rename the development files and save them to a production directory.
Scalenut
scalenut.com › home › blogs › best javascript minifier: top tools and factors to consider
Best JavaScript Minifier: Top Tools and Factors to Consider
UglifyJS is a popular JavaScript minification tool that can parse, minify, and compress JavaScript code. It also generates a source map file while compressing your code, allowing you to track it back to your original code. UglifyJS can parse multiple input files simultaneously, parsing the input files first, then the options. This organization also offers a CSS Minfier which is considered as one of the best CSS Minifer tools out there.
DigitalOcean
digitalocean.com › community › tools › minify
JavaScript Minify Tool | DigitalOcean
Minify your JavaScript source code with our interactive web interface for Terser.
Fonzi AI
fonzi.ai › blog › javascript-minifier
Best JavaScript Minifier Tools: Compress JS Code Online for Free - Fonzi AI Recruiter
December 9, 2025 - Selecting the right JavaScript ... faster page load times and better search engine rankings. Terser stands out as the best overall choice for most modern projects, offering strong ES6+ support and seamless integration with ...
FusionCharts
fusioncharts.com › home › 5 javascript minification tools to improve code performance 2026
5 JavaScript Minification Tools to Improve Code Performance 2026
January 20, 2026 - ShrinkSafe is another compressor that parses the JavaScript using the rhino library and crunches local variable names. It can typically reduce the size of your scripts by a third or more, depending on your programming style. Best of all, ShrinkSafe will never change a public variable or API.
Devsaran
devsaran.com › blog › 10-best-javascript-minifying-tools
10 Best JavaScript Minifying Tools | Devsaran
AjaxminUi can superbly minify all your JavaScript files in a folder as well as nested folders. It can even minimize the individual JavaScript files; charge the minifier in the background; analyze the productivity of minifier, and open up the productive folder when the minifier ends.
Reddit
reddit.com › r/learnprogramming › what are the best online tools for minifying/ obfuscating css and javascript?
r/learnprogramming on Reddit: What are the best online tools for minifying/ obfuscating css and javascript?
December 24, 2023 -
I'm not a techie, just trying to learn ways to make my blog more secure. I have used some basic css and javascript and I read hackers can harm the website if they can read the code.
Again, I know almost nothing about coding. I learned some basic html, css and javascript during highschool.
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Obscuring your css and javascript won't make your site more secure at all. Don't do it. Your CSS and JavaScript are part of the frontend. Those parts get sent to every user who visits your blog, and they run in the user's browser. There's no point in securing them. Users can modify their copy if they want, but that's not affecting your blog. You can open up Apple.com or WhiteHouse.gov right now in your browser and edit the HTML, CSS, and JavaScript to your heart's content. You can change what it does...for you. It won't affect the page for anyone else. As soon as you reload the page, your changes will be gone. The only part of your blog you need to secure is the backend. If you host your blog at a hosting provider and you sign in using a username/password, you need to secure that. Use two-factor authentication and a strong password. If you use a database, make sure it has its own strong password, and make sure that the password isn't stored anywhere in your backend code. It should be loaded from a secure key store service. If you have features where users can sign in and post articles or comments, or anything like that, you need to secure those features. You need to make sure your code doesn't "trust" anything it gets via those features. If you don't have any custom, hand-written backend code, then you probably don't have to do anything.
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None of those do anything for security actually. I wouldn't touch it, there's no point in it, as others have already explained to you.
Top answer 1 of 4
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Possibly UglifyJS? It's the minifier that the jQuery project is currently using.
Check out these speed comparisons.
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See the statistics src: http://axod.blogspot.ca/2010/01/google-closure-compiler-advanced-mode.html
compare JSMin, by Douglas Crockford and Yahoo! YUI
Minifier | Bytes |% of original| gz Bytes | gz % original
None | 428,264 | 100% | 91,750 | 100%
JSMin | 249,372 | 58% | 57,338 | 62%
YUI | 235,214 | 55% | 55,990 | 61%
Closure (STANDARD) | 219,446 | 51% | 53,515 | 58%
Closure (ADVANCED) | 166,774 | 39% | 47,372 | 52%
Closure takes the idea of a Javascript minifier a step further. It does this by doing real compilation to remove unused code, inlines variables and rewrites code to make it as small as possible.
Just for reference, you can access the Google Closure Compiler UI here http://closure-compiler.appspot.com/home
FastComet
fastcomet.com › blog › javascript-minification-tools
Minify JavaScript Like a Pro — Proven Tools and Methods | FastComet
September 29, 2022 - To begin, copy and paste your JavaScript source code into the tool or upload the source code file. If alternatives are available, you’ll tweak the minification tool’s parameters to produce a requirement-based result. Finally, instead of the original, enlarged code, you’ll utilize the minified file on the website · Note: You should keep the original source code file in safekeeping, just in case. Here are some of the best ...
WP Rocket
wp-rocket.me › home › blog › themes & plugins › best free css and javascript minification tools
Which are the Best CSS and JavaScript Minification Tools for WordPress?
April 27, 2022 - In this article, we’ll go over the best free CSS and JavaScript minification tools you can use for your own projects.