JavaScript Obfuscator
FormattersObfuscate JavaScript with Low, Medium, and High presets. Control flow flattening, dead code injection, RC4 string encoding, self-defending, and debug protection.
About JavaScript Obfuscator
The JavaScript Obfuscator is powered by the `javascript-obfuscator` library — the most capable open-source JavaScript obfuscation engine. It protects your source code against reverse engineering through three graduated protection presets (Low, Medium, High), each activating a different combination of transformation techniques. Individual options can be toggled independently to customise the protection profile without leaving a preset entirely. All processing runs client-side via a dynamic import in your browser — your code never leaves your device.
Features
- ✓Three protection presets: Low, Medium, and High — each with a labelled description
- ✓Low preset: hexadecimal identifier renaming and string array encoding (none)
- ✓Medium preset: adds control flow flattening (50% threshold), dead code injection (20%), Base64 string encoding, and console output disabling
- ✓High preset: adds RC4 string encoding, self-defending code, debug protection with 4-second interval, unicode escape sequences, and maximum dead code injection (40%)
- ✓Seven individually toggleable options: control flow flattening, dead code injection, string array, self-defending, debug protection, console.* disabling, and unicode escape sequences
- ✓Per-toggle override merging — change individual options without fully leaving a preset
- ✓Powered by javascript-obfuscator run via dynamic import (no upfront bundle cost)
- ✓Syntax-highlighted editor for both input and obfuscated output
- ✓One-click clipboard copy of obfuscated output
- ✓Real-time byte count (obfuscated output size displayed after run)
- ✓Status bar showing processing state and final character count
- ✓Mobile-responsive layout
- ✓100% client-side — your code never leaves the browser
Common Use Cases
- Protecting JavaScript-based licensing or activation logic before distributing SDKs
- Deterring casual reverse engineering of browser-based game logic
- Obfuscating proprietary algorithm implementations in client-side scripts
- Protecting CDN-served JavaScript utilities against easy copying
- Testing how well an obfuscation preset resists manual analysis before shipping
- Removing console.log calls from production builds as part of an obfuscation pass
Frequently Asked Questions
QWhat is control flow flattening?
Control flow flattening wraps code branches inside a dispatch loop with a switch statement, making the logical execution order opaque to static analysis tools and human reviewers.
QWhat is the difference between Low, Medium, and High presets?
Low: minimal footprint, fast execution, identifier renaming only. Medium: adds control flow flattening, dead code injection, and Base64 string encoding — best for most use cases. High: maximum protection with RC4 encoding, self-defending code, and debug protection — significantly increases file size.
QWill obfuscation break my code?
For standard JavaScript that does not rely on function.name, stack traces, or eval-based code loading, obfuscation should preserve runtime behaviour. Self-defending mode prevents the file from running if reformatted, so test in your target environment.
QIs my code sent to a server?
No. The javascript-obfuscator library is dynamically imported and runs entirely in your browser. Nothing is transmitted to any server.