JavaScript Obfuscator
Make your JavaScript harder to read and copy, in the browser.
JavaScript Obfuscator – Make Your Code Harder to Read
The JavaScript Obfuscator transforms your source into a functionally identical but much harder-to-read version. It renames variables, pulls string literals into an encoded lookup array, can flatten control flow and inject dead code, and compacts the result. The output still runs exactly like the input; it is just unpleasant to read and to copy by hand. Everything runs in your browser with the open-source javascript-obfuscator engine, so your code is never uploaded.
Strength presets
- Low – rename identifiers and build a string array. Fast, small output, still somewhat followable.
- Medium – adds base64 string encoding, string array rotation and wrappers, control-flow flattening, some dead code and number-to-expression conversion. A good default.
- High – maximum settings: RC4 string encoding, full control-flow flattening and dead-code injection, short string splitting and unicode escapes. The output is the largest and slowest, and the hardest to reverse by hand.
Options
Choose how variables are renamed (hexadecimal like _0x3f2a, or short mangled names), target Browser or Node.js, optionally rename global variables, optionally disable console output in the result, and set a numeric seed so the same input always produces the same output (handy for reproducible builds).
What obfuscation is and is not
Obfuscation raises the effort needed to read or reuse your code and discourages casual copying. It is not encryption and not a security boundary: anything shipped to a browser can still be run, traced and, with enough effort, understood. Never rely on it to hide secrets such as API keys or passwords — keep those on the server. Treat it as a deterrent and as a way to protect the structure of your front-end logic.
Tips
Obfuscation increases file size and can slow execution, especially at high strength, so obfuscate the final bundle and measure the result. If you only want a smaller file, the JS Minifier is enough. Validate your code first with the JavaScript Validator so you obfuscate code that already parses.
Frequently Asked Questions
Does obfuscation protect my code completely?
No. It makes code harder to read and to copy, but anything that runs in a browser can be executed and inspected. It is a deterrent, not encryption, and it must never be used to hide secrets like API keys.
Will the obfuscated code still work?
Yes. The transformations preserve behavior, so the output produces the same results as the input. Very high settings can slow execution, so test the result and pick the lowest strength that meets your needs.
Why is the output so much bigger?
Encoded string arrays, control-flow flattening and dead-code injection all add code. That is expected; obfuscation trades size and speed for how hard the code is to read. Lower the strength or use the minifier if size matters most.
What does the seed do?
The obfuscator makes random choices (names, ordering, dead code). A fixed non-zero seed makes those choices deterministic, so the same input always yields the same output — useful for reproducible builds and diffs. Leave it at 0 for a different result each time.