Javascript Obfuscator

Free online Javascript Obfuscator tool. JavaScript Obfuscator is a free online tool that obfuscates your source code, preventing it from being stolen and used without permission.

JavaScript obfuscation is a series of code transformations that turn plain, easy-to-read JS code into a modified version that is extremely hard to understand and reverse-engineer. Unlike encryption, where you must supply a password used for decryption, there's no decryption key in JavaScript obfuscation.

Serving a JavaScript file without obfuscation, simply means that the code in the file will be readable by anyone. So if that person understands JavaScript, your source code is public now. So if the JavaScript code works without server interaction, someone could just download the HTML of your page, the resources (JS and CSS) and will obtain the same result locally. So, if the code is readable as well, this person could steal your work and modify it at its will.

Advantages of obfuscating JS

  • Prevent people from copying or modifying your code without authorization.
  • The obfuscated JavaScript will be way larger and difficult to understand. Most obfuscators use control-flow flattening, an obfuscation technique that splits the source code basic blocks as loops and conditional branches and places them inside a single infinite loop with a switch statement, making the code harder to follow.
  • Exact functionality, not because the code is different it will behave differently.
  • Debug protection, is useful if you don't want people to simply open the console to see what's going on with the JavaScript.

Disadvantages of obfuscating JS

  • Although the output JavaScript is harder to read, this doesn't mean that it's impossible. If someone takes enough time, dedication, and knowledge to read it, in the end, he will.
  • The speed of your code may be affected especially when using a high obfuscation level.
  • The size of your code may increase drastically as well, which may affect the loading times of your webpage. Although usually, if you use GZIP to serve your files, as a big part of the code is repetitive, it may end up well compressed.
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