JavaScript Obfuscator Free

Protect your JavaScript source code with the most powerful free online obfuscator. String encryption, control flow flattening, dead code injection & more — 100% in your browser.

Source Code JS
or drag & drop onto the editor
Obfuscated Output OBF
String Array
String Array Extract strings into an array
Encoding Encode extracted strings
Threshold Probability of extraction (0–1)
0.75
Rotate Array Shift array at runtime
Shuffle Array Randomize array order
Wrappers Count Number of wrapper functions
Wrappers Type Variable or function wrappers
Calls Transform Transform accessor calls
Split Strings Split long strings into chunks
Unicode Escape Convert to \uXXXX format
Identifiers
Names Generator Strategy for new identifiers
Rename Globals Rename global variables
Control Flow
Control Flow Flattening Flatten loops & conditionals
Flattening Threshold How much flattening (0–1)
0.75
Dead Code Injection Insert fake code blocks
Dead Code Threshold How much dead code (0–1)
0.4
Conversions
Numbers to Expressions Convert 5 → 2 + 3
Transform Object Keys Obfuscate object properties
Simplify Additional simplification pass
Compact Code Single-line output
Protection
Debug Protection Disable DevTools debugging
Self Defending Anti-tampering protection
Disable Console Block console.log etc.

Why Choose Our JS Obfuscator?

Enterprise-grade JavaScript protection — completely free, no limits.

source.js JS obfuscated.js OBF

30+ Obfuscation Techniques

String array extraction with Base64/RC4 encoding, control flow flattening, dead code injection, identifier mangling, number expressions, unicode escapes & more.

4 Built-in Presets

Quickly choose Low, Medium, High, or Maximum protection levels. Or fine-tune every option individually in Custom mode.

100% Browser-Based

Your code never leaves your device. Zero server uploads, zero data collection. All obfuscation runs locally using the industry-standard javascript-obfuscator engine.

Anti-Debug & Self-Defending

Enable debug protection to freeze DevTools, self-defending mode to prevent code tampering, and console output disabling.

Drag & Drop Upload

Drag your .js file directly onto the editor or click to upload. Instant file loading with size display. Download obfuscated code with one click.

Free & Unlimited

No file size limits, no daily caps, no registration. Obfuscate as many files as you want, as often as you want. Completely free forever.