JavaScript Minifier
Remove comments and extra whitespace from JavaScript locally.
Your input stays in your browser. Nothing is uploaded.
Input
Output
About this tool
This is whitespace and comment stripping, not identifier mangling. ASI edge cases can still matter—review the output.
How it works
Paste JavaScript, minify, and copy. Prefer a bundler for production builds.
strip // and /* */ + collapse whitespace outside strings
Examples
Comment
A // comment is dropped; code on the next line stays.
FAQ
Will it break my code?
It tries to keep strings intact. Unusual ASI or regex literals may need a full minifier.
Is my data uploaded?
No. Formatting, encoding, and generation run in your browser.
Can I use this offline after the page loads?
Yes, as long as the page stays open. Nothing is sent to a SmartKitio API.