Free online tool to obfuscate your JavaScript code. Paste your code, obfuscate it in seconds, and protect it against reverse engineering, copying, and tampering.
Your obfuscated code will appear here
Options
Your code is processed securely and never stored. Free to use, no signup required to start.
Whole-project protection
The online tool above is a quick JavaScript obfuscator for single files. For a real project, you need obfuscation built into your pipeline. ByteHide installs as a JavaScript obfuscator for your build, protecting your whole codebase on every release. Free to use with a ByteHide account.
Install for your build
Webpack
Bundlers
npm install --save-dev @bytehide/webpack-shieldAdd ByteHide as a step in your Webpack build.
Full setup guide in the docsVite
Bundlers
npm install --save-dev @bytehide/vite-shieldProtect every Vite production build automatically.
Full setup guide in the docsRollup
Bundlers
npm install --save-dev @bytehide/rollup-shieldAdd obfuscation to your Rollup bundle.
Full setup guide in the docsNext.js
Frameworks
npm install --save-dev @bytehide/next-shieldIntegrate protection into your Next.js build pipeline.
Full setup guide in the docsAngular
Frameworks
npm install --save-dev @bytehide/angular-shieldProtect your Angular application at build time.
Full setup guide in the docsReact Native
Frameworks
npm install --save-dev @bytehide/react-native-shieldProtect your React Native app bundle.
Full setup guide in the docsGulp
Task runners
npm install --save-dev @bytehide/gulp-shieldAdd a protection task to your Gulp workflow.
Full setup guide in the docsGrunt
Task runners
npm install --save-dev @bytehide/grunt-shieldAdd obfuscation to your Grunt build.
Full setup guide in the docsCommand line
CLI
npm install -g @bytehide/shield-cliProtect any JavaScript project straight from your terminal.
Full setup guide in the docsFree to use with a ByteHide account
The package is free to use. The first time it runs, it asks for a token that connects it to your ByteHide account. Create a free account to get yours.
Whether you use Webpack, Vite, or a framework build, there is a ByteHide JavaScript obfuscator package that fits it. These packages give you the obfuscation built into ByteHide Shield, integrated straight into your build. When you are ready for advanced configuration, runtime protection, and code virtualization, it is all part of the same account.
See everything in ByteHide ShieldHow it works
Obfuscating your JavaScript takes three steps. No installation, no account to get started.
Step 01
Paste the JavaScript you want to protect into the source panel above. Any modern JavaScript works, including ES2022 and later.
Step 02
Select what the obfuscator should apply: variable renaming, string encryption, compact output. The defaults already give you solid protection.
Step 03
Click Obfuscate. Your protected code appears in seconds, ready to copy into your project. It runs exactly like your original.
What it does
This free obfuscator applies the core transformations that make JavaScript hard to read and reverse engineer.
These are the fundamentals of JavaScript obfuscation. For advanced protection, see how ByteHide Shield goes further below.
Example
Obfuscation is easier to understand when you see it. Here is a small piece of JavaScript before and after this tool obfuscates it.
function validateLicense(key) {
const expectedKey = 'ByteH1de!2026';
if (key === expectedKey) {
console.log('Valid license');
return true;
}
return false;
}function _0xa1(b){var c=_0x4f(0x12);var d=0;
while(true)switch(d){
case 0x0:d=b===c?0x1:0x2;break;
case 0x1:_0x4f(0x13);return!0;
case 0x2:return!1;
}
}Same behavior, unreadable result. The code runs exactly as before, but an attacker reading it learns nothing.
Options
This obfuscator gives you control over how your code is protected. Here is what each option does and when to use it.
These options cover the fundamentals. ByteHide Shield adds advanced configuration for each one, plus protections this free tool does not include.
Why obfuscate
JavaScript is delivered to the browser as source code. Anyone who opens developer tools can read it, copy it, and reuse it. Obfuscation is what stands in their way.
Clarification
These three are often confused, but they solve different problems. Here is how they differ.
For protecting JavaScript that ships to the browser, obfuscation is the right tool. Minification can be applied alongside it for performance. Encryption is for data, not executable code.
Techniques
Obfuscation is not one transformation, it is several working together. These are the main techniques, and how each one protects your code.
This free tool applies the core techniques. ByteHide Shield applies all of them, including code virtualization, with advanced configuration, across your whole application.
Free vs Shield
This online tool gives you fast, solid obfuscation for individual files. ByteHide Shield is the full version, built to protect production applications.
Production-grade protection
A free online obfuscator protects a single file with the core transformations. ByteHide Shield is built to protect a production application: every technique in this guide, plus code virtualization that compiles your logic to custom bytecode, runtime self-protection, and coverage for your framework. The free tool is where you start. Shield is where you protect what ships.
Explore ByteHide Shield for JavaScriptAbout this tool
Most free obfuscators are side projects. This one is built and maintained by ByteHide, an application security company protecting software across .NET, JavaScript, Android, and iOS.
That means this tool is not abandonware. It is part of a platform that protects real production applications, and it is kept current with how JavaScript and the threats against it evolve.
This free tool protects individual files. When you are ready to protect a complete production application, with advanced obfuscation, code virtualization, runtime self-protection, and coverage for your framework, ByteHide Shield is the next step.
