JavaScript Obfuscator

This tool runs the open-source javascript-obfuscator library in your browser. The presets map to its built-in option sets. Low renames identifiers to hexadecimal names like _0x3a1f, moves string literals into a rotated, shuffled array and simplifies code layout; performance impact is small. Medium adds control-flow flattening (functions become switch-based state machines), Base64-encoded strings and dead-code injection. High adds RC4-encoded strings, self-defending code that breaks when reformatted, and more aggressive transformations — expect code that is several times larger and noticeably slower.

Rename globals also renames top-level functions and variables; only use it when no other script calls them. Disable console output replaces console methods at runtime. Reproducible output uses a fixed seed so the same input always gives the same output, which helps with caching and diffs.

Be realistic about what obfuscation buys you. The browser must be able to run the code, so it can always be executed, stepped through in a debugger and gradually reversed with deobfuscation tools. Use it to deter casual copying, never to hide API keys, license checks or business logic that must stay secret — keep those on the server. Always test obfuscated code before releasing it.