A best-effort JS minifier
This tool removes comments and collapses whitespace without renaming variables, so it is safe for most scripts but produces less aggressive savings than a full AST-based minifier like Terser.
JavaScript Minifier
Paste JavaScript to strip comments and extra whitespace for a smaller file.
How it works
- 1
Paste your input into the editor.
- 2
Choose format / mode options if available.
- 3
Copy the transformed output (it usually updates as you edit).
Why use this tool
- Runs entirely in your browser — nothing is uploaded to a server.
- 100% free, no sign-up, no limits.
- Works in any modern browser — no app install, no extension, no account.
How to use JavaScript Minifier
Paste into JavaScript Minifier, tweak options, and copy the output. Formatting and conversion run in the browser for this tool.
Tips for better results
Keep a backup of original input before bulk transforms. Invalid input should show an error instead of silent corruption.
Privacy and offline-friendly processing
Whenever possible, JavaScript Minifier processes your data locally with JavaScript in this page. That means drafts, secrets, and unfinished work stay on your device by default. Prefer this workflow when you do not want to upload sensitive text, tokens, passwords, or files to a third-party service.
Frequently asked questions
Does this rename variables to shorten code?
No, only comments and whitespace are removed — variable and function names stay the same.
Should I use this for production builds?
For quick sharing or small scripts it works well; for production bundles, a dedicated build-time minifier is safer.
Is my data uploaded when I use this tool?
For most FlyUtils tools, no. Processing happens in your browser with JavaScript. If a tool ever needs a server, that will be stated clearly on the page.
Is JavaScript Minifier free to use?
Yes. JavaScript Minifier is free, with no sign-up and no artificial usage caps for normal personal and work use.
Does JavaScript Minifier work on mobile?
Yes. The page is mobile-first, so you can paste input, tweak options, and copy results from a phone or tablet.