ADVANCED DEVELOPER
Free JS Obfuscator online
Basic JavaScript obfuscation.
Use JS Obfuscator to basic JavaScript obfuscation in seconds, straight from your browser. Enter your file, review the live JS Obfuscator output, then copy or download it. JS Obfuscator processes everything in your own browser, so your data never leaves your device.
- Free to use
- No signup
- Private and local
- Unlimited use
Why use JS Obfuscator
- basic JavaScript obfuscation without installing software
- Your file is processed on your device by JS Obfuscator, never uploaded
- JS Obfuscator needs no account, email address or payment details
- JS Obfuscator shows live output that updates as you type
- JS Obfuscator is keyboard accessible and screen-reader friendly
- JS Obfuscator is free forever, with no watermark on the result
JS Obfuscator 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 JS Obfuscator
- Enter your file Paste or type your file into the input panel above.
- Adjust the options Set the options that control how JS Obfuscator handles your input.
- Apply the change JS Obfuscator 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 JS Obfuscator works. JS Obfuscator never sends it to a server, so confidential work stays confidential.
Instant results
There is no upload step, so JS Obfuscator starts the moment you add your file.
No signup, no limits
Use JS Obfuscator as many times as you want. JS Obfuscator asks for no account, adds no watermark and keeps no paid tier gating the output.
Works on any device
JS Obfuscator runs in any modern browser on desktop, tablet and phone, with a keyboard-accessible interface throughout.
Who it is for
For developers
Developers use JS Obfuscator to debug and ship faster without installing software: basic JavaScript obfuscation on a shared or locked-down machine.
For freelancers
JS Obfuscator helps freelancers send client deliverables quickly, since your file never leaves the laptop it was created on.
For support teams
JS Obfuscator helps support teams answer customer requests quickly, since your file never leaves the laptop it was created on.
How it works
JS Obfuscator 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 JS Obfuscator happens inside your browser sandbox.
Frequently asked questions
Is JS Obfuscator free to use?
Yes. JS Obfuscator is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does JS Obfuscator upload your file to a server?
No. JS Obfuscator 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?
JS Obfuscator 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 JS Obfuscator?
No installation is needed. JS Obfuscator runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use JS Obfuscator on a phone or tablet?
Yes. The JS Obfuscator 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. JS Obfuscator keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
Related tools
- JavaScript Beautifier | Format and indent JavaScript code
- JavaScript Minifier | Minify JavaScript code
- JS Deobfuscator | Deobfuscate JavaScript code
Last updated: 2026-09-07