CODE FORMATTERS
Free JavaScript Minifier online
Minify JavaScript code.
JavaScript Minifier is a free browser tool that lets you minify JavaScript code. Paste your file into JavaScript Minifier, tweak the options, and take the result with one click. JavaScript Minifier works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- Private and local
- Unlimited use
Why use JavaScript Minifier
- minify JavaScript code without installing software
- Your file is processed on your device by JavaScript Minifier, never uploaded
- JavaScript Minifier needs no account, email address or payment details
- JavaScript Minifier shows live output that updates as you type
- JavaScript Minifier is keyboard accessible and screen-reader friendly
- JavaScript Minifier is free forever, with no watermark on the result
JavaScript Minifier runs entirely inside your browser. Your file is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use JavaScript Minifier
- Enter your file Paste or type your file into the input panel above.
- Adjust the options Set the options that control how JavaScript Minifier handles your input.
- Run the tool JavaScript Minifier works instantly on your device, with no queue and no upload wait.
- Copy or download Copy the output to your clipboard or download it as a file, free and unlimited.
Benefits
Private by design
Your file stays on your device while JavaScript Minifier works. JavaScript Minifier never sends it to a server, so confidential work stays confidential.
Instant results
JavaScript Minifier finishes most jobs in under a second because the work happens on your own hardware.
No signup, no limits
Use JavaScript Minifier as many times as you want. JavaScript Minifier asks for no account, adds no watermark and keeps no paid tier gating the output.
Works on any device
JavaScript Minifier runs in any modern browser on desktop, tablet and phone, with a keyboard-accessible interface throughout.
Who it is for
For developers
Developers use JavaScript Minifier to debug and ship faster without installing software: minify JavaScript code on a shared or locked-down machine.
For freelancers
JavaScript Minifier helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
For support teams
JavaScript Minifier helps support teams answer customer requests quickly, since your file never leaves the laptop it was created on.
How it works
JavaScript Minifier loads your file into memory, applies the change you requested to the underlying data rather than to a screenshot of it, and writes a fresh copy for download. Your original stays untouched on disk, and every step of JavaScript Minifier happens inside your browser sandbox.
Frequently asked questions
Is JavaScript Minifier free to use?
Yes. JavaScript Minifier is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does JavaScript Minifier upload your file to a server?
No. JavaScript Minifier processes your file inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a limit on how much input I can use?
JavaScript Minifier handles inputs into the megabytes without trouble; the only real limit is how much your browser tab can hold in memory.
Do I need to install anything to use JavaScript Minifier?
No installation is needed. JavaScript Minifier runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use JavaScript Minifier on a phone or tablet?
Yes. The JavaScript Minifier interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your file when I close the tab?
It is discarded. JavaScript Minifier keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
Related tools
- HTML Minifier | Minify HTML by removing whitespace
- CSS Minifier | Minify CSS by removing whitespace
- JSON Minifier | Minify JSON by removing whitespace
Last updated: 2026-09-07