Protect your JavaScript with VM Obfuscation
Your code is compiled into virtual-machine bytecode on our server. The output runs eval-free, and the engine core never reaches the browser.
// fib.js — nguyên bản
(function() {
function fibonacci(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
}
for (var i = 0; i < 10; i++) {
console.log('F(' + i + ') = ' + fibonacci(i));
}
})();var _0x=TNVMStart(["α3f#μ",194,"⟁5″",…]);
EVK(0x1d,"³þ↯7"…_0x[11]…{});…
function _0x4f2a(n){var ξ=[…"\x66\x69\x62"…];
return ξ^0x9f(…n-0x1…+…n-0x2…)}Try it now
Free anonymous use: max 128 KB of code, default presets (low / medium) only, rate-limited. Sign up for more.
Why JsVM
Not just minified — rewritten into bytecode inside a private virtual machine.
VM Bytecode
Top-level functions compile into custom VM bytecode — nothing left to read.
Identifier Renaming
Names are mangled beyond recognition while behavior stays identical.
21 Engine Options
Integrity binding, rolling cipher and more — tune every layer of protection.
Server-side Engine
The core engine never ships to the browser — compilation happens on our server.
Pricing
Start free — upgrade for bigger files, the max preset and API keys.
Frequently Asked Questions
Short answers about the service, plans and payments.
What is VM obfuscation?
Your JavaScript is compiled into custom bytecode executed by a virtual machine, instead of just being renamed or minified. The output still runs in browsers and Node.js — but there is nothing left to read.
Is my source code stored on the server?
No. Code is processed in memory and returned to you immediately — we keep neither your original nor the protected output. Only monthly usage counters are recorded.
Can I try it without an account?
Yes — the tool above works anonymously: 128 KB per file, low & medium presets. Create a free account for larger files; Pro+ plans add the max preset, API keys and more.
Is obfuscated code unbreakable?
No protection is absolute. VM obfuscation multiplies the cost of reverse-engineering — minutes become days or weeks. It is one strong layer, not a magic lock.
How do plans and payments work?
Monthly (30 days) or yearly (365 days, 25% off) cycles, extra cycles stack. Pay via ACB bank transfer (auto-verified) or PayPal — all prices include 10% VAT.