JavaScript Obfuscator
Obfuscate JavaScript code to protect your source code
Input
Obfuscated Output
What Is the JavaScript Obfuscator?
The JavaScript Obfuscator transforms JavaScript to make it harder to read and reverse-engineer. Variable names are mangled, strings encoded, and control flow obscured. Use it to protect client-side code. The ECMAScript spec defines the language.
This tool runs entirely in your browser. Nothing is sent to a server. Paste JS or upload a file; get obfuscated output. For deobfuscating, use JavaScript Deobfuscator. For minifying only, use JavaScript Minifier. For formatting, use JavaScript Formatter.
How to Use This Tool
Paste or Upload
Paste JavaScript into the left panel or upload a .js or .txt file. Use Sample to load example code. Use Clear to reset.
View Obfuscated Output
The right panel shows obfuscated code. The logic is preserved but the code is harder to read and reverse.
Copy or Download
Use Copy or Download to get the obfuscated code. Test it before deploying. Obfuscation can affect performance.
JavaScript Obfuscator Examples
Here is an example of obfuscating JavaScript (variable names are mangled).
Example: MSISDN validation
Input (readable):
Obfuscated output (names mangled):
When the JavaScript Obfuscator Helps
When you need to protect client-side logic, hide algorithms, or discourage casual copying, obfuscation adds a layer of difficulty. It is not security; determined users can still reverse it. For size reduction, use JavaScript Minifier. Build tools like webpack and rollup can bundle obfuscated code. See source maps for debugging.
Frequently Asked Questions
Is my data private?
Yes. Obfuscation runs entirely in your browser. No data is sent to any server.
Does obfuscation break code?
Proper obfuscation preserves behavior. Test the output. Some edge cases or eval-based code may be affected.
Can obfuscated code be reversed?
Yes. Obfuscation makes it harder, not impossible. Use JavaScript Deobfuscator to see how much can be recovered.
Obfuscator vs Minifier?
Minifier shrinks code. Obfuscator makes it harder to read. Obfuscation often increases file size.
What about performance?
Heavy obfuscation can slow execution. Use moderate settings for production. Test before deploying.