This is a professional, free, and efficient online JavaScript obfuscation tool designed to protect your frontend code logic. By transforming readable source code into a complex, hard-to-understand format using advanced algorithms like control flow flattening and string encryption, it effectively prevents your scripts from being analyzed, copied, or tampered with by others while maintaining the original functionality.

Since JavaScript runs on the client side, the source code is transparent to browsers and users. Obfuscation is crucial for protecting intellectual property, proprietary algorithms, and game logic. It significantly raises the difficulty barrier for reverse engineering, discouraging code theft and malicious modification, which is essential for commercial projects and sensitive data handling.

It depends on the protection level you choose. Basic compression and variable renaming have negligible impact. However, advanced features like 'Control Flow Flattening' or 'Dead Code Injection' can slow down execution speed to achieve higher security. We recommend using the 'Medium' preset for a balanced approach or the 'High' preset only for critical logic sections where security outweighs performance.

While no code sent to a browser is theoretically 100% secure, high-quality obfuscation makes reverse engineering extremely time-consuming and cost-prohibitive. Techniques like 'Self Defending' and 'Anti-Debugging' make automated de-obfuscators fail. The result is code that is functional but practically unreadable to humans, meaning the original variable names and comments are permanently lost.

Anti-Debugging features inject code that detects if a browser's Developer Tools (Console) are open, often causing the script to stop or hang to prevent analysis. Domain Lock ensures the code only runs on specific websites you authorize. These features are powerful countermeasures against users trying to inspect or steal your application logic in real-time.