JavaScript Obfuscator (Max)
Browser-only JavaScript obfuscator powered by the javascript-obfuscator engine (same core as obfuscator.io). Minify, rename identifiers to confusable X/x blobs, string array with rotation + shuffling + RC4/base64 encoding, control-flow flattening, dead code injection, split strings, self-defending + debug protection, plus an optional XOR-cipher final wrap. Nothing ever leaves the page.
How to Use
- Paste JS into the input box (a full module, a bundled file, inline snippets — all work).
- Pick which layers to apply or hit Max Security to enable everything.
- Click Obfuscate. First click downloads the javascript-obfuscator bundle (~1.4 MB, browser-cached after) so the whole thing runs client-side.
- Verify runs the obfuscated code in a sandboxed iframe and compares console output with the original.
- Copy or download the result as .js.
The nine layers
About the JavaScript Obfuscator (Max)
JavaScript Obfuscator (Max) is a quick, free tool for web development and data tasks. It works in your browser and keeps everything on your device. Browser-only JavaScript obfuscator powered by the javascript-obfuscator engine (same core as obfuscator.io). Minify, rename identifiers to confusable X/x blobs, string array with rotation + shuffling + RC4/base64 encoding, control-flow flattening, dead code injection, split strings, self-defending + debug protection, plus an optional XOR-cipher final wrap. Nothing ever leaves the page.
How it works
Enter what you have and read the result as it updates live. It all runs on your own device, so it is quick and private, with nothing to install.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Does my source leave the page?
No. javascript-obfuscator is a full browser bundle and everything runs inside your tab. No server call, no upload.
Is this reversible?
Nothing perfect — a determined reverse engineer can still unpack. But the stacked passes (string array + rotation + RC4 + control-flow flattening + dead code + debug protection + XOR wrap) force any attacker to either run the code or write a custom deobfuscator.
What is control-flow flattening?
Linear statements are rewritten as a big switch-in-a-loop that jumps between "states". Reading control flow becomes very hard without running the code.
Why is debug protection annoying?
When enabled, the obfuscated code fights browser DevTools: infinite debugger statements, attribute tampering detection. Keep it OFF for code you want to be able to debug yourself.
Will this break my code?
Rarely. Code that inspects its own source (Function.prototype.toString tricks), or relies on eval() variable hoisting, or uses specific function.name values may need "reservedNames" configured. The Verify button runs both versions side-by-side so you can catch regressions.
How do I use the JavaScript Obfuscator (Max)?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Does it cost anything or need an account?
No. The tool is completely free, there is no account to create, and it keeps working offline after the page first loads.
Is anything I type uploaded?
No. The tool works entirely on your device, so the values you enter never leave your browser.
Common Use Cases
Protect commercial JS
Make source hard to read before shipping a bundle to customers.
CTF / reverse-engineering challenge
Build a JS challenge that takes serious effort to unpack.
Strip PII from shared JS
Use only the rename + string array layers to hide internal names / keys / endpoints before a demo.
Post-minify hardening
Add a second obfuscation layer on top of your existing minified build.
Last updated: