JavaScript Minifier & Formatter | Clean or Compress JS
Beautify JavaScript snippets for reading or minify functions, objects, and browser scripts before copying into a page or bundle.
Format or Minify JavaScript Snippets
Beautify compressed JavaScript into readable indentation, or minify readable snippets into compact code for embeds, demos, prototypes, and browser scripts.
Review Syntax and Runtime Behavior
Formatting does not fix broken logic, and minification can make debugging harder. Test scripts that use modules, JSX, TypeScript syntax, or build-tool features in the target environment.
Best Places to Use It
Use it for small JavaScript snippets from docs, analytics tags, widgets, bookmarklets, bug reports, or copied code that needs quick cleanup before inspection.
About This Tool
JavaScript Minifier and Formatter compresses JavaScript by removing whitespace and comments, and also formats minified code back into readable indented form. Both operations are useful at different stages of development.
When to Use It
Use the minifier before deploying JavaScript to production to reduce file size. Use the formatter when debugging minified third-party scripts or reviewing downloaded code.
How to Use
- Paste your JavaScript into the input area.
- Choose Minify to compress or Format to expand.
- Click Process to produce the output.
- Copy the result.
Frequently Asked Questions
How much does minification reduce JavaScript file size?
Removing comments and whitespace typically reduces size by 20 to 40 percent. Variable shortening in aggressive minification can achieve 50 to 60 percent reduction.
Is it safe to minify third-party libraries?
Most third-party libraries already ship minified. Re-minifying an already-minified file adds little benefit and may introduce errors.
Can minified code be read again?
Formatting restores indentation but cannot recover original variable names if they were shortened. Comments removed by minification are permanently gone.