JavaScript
Online JavaScript minifier
Reduce your JavaScript files with conservative minification that prioritizes preserving code behavior.
JavaScript minifier
JavaScript guide
What is a JavaScript minifier?
A minifier reduces code size by removing unnecessary characters such as whitespace, line breaks and comments without changing behavior when the analysis is correct.
Why minify JavaScript?
Smaller files download faster, use less bandwidth and can improve website performance in production.
Does minification change behavior?
This tool uses a conservative strategy to preserve strings, template literals, regular expressions and important separators. It does not execute or fully validate code.
Minification versus compression
Minification removes code characters; gzip and Brotli compress bytes during transfer. They are different and complementary techniques.
Frequently asked questions
JavaScript minification questions
What is minified JavaScript?
It is JavaScript with unnecessary whitespace, line breaks and comments reduced to use less space.
Does minifying JavaScript improve web speed?
It can reduce downloaded size and transfer time, especially together with Brotli or gzip.
Can a minified file be reversed?
It can be partially beautified, but the original comments and formatting usually cannot be recovered.
Is it safe to minify JavaScript?
The tool uses conservative minification and never executes code, but you should test the result before publishing.
Are comments removed?
Normal comments are removed. Comments starting with /*! or containing @preserve are retained.
Does it support JavaScript ES6+?
It preserves common modern syntax such as arrow functions, classes and template literals without transforming the language.
Is entered code stored?
It is not permanently stored and is never executed on the server.