Loading tool…
Loading tool…
Protect your JavaScript code by making it unreadable to humans, all within your browser.
Protect your JavaScript code by making it unreadable to humans, all within your browser.
Nextooly’s JavaScript Obfuscator is a powerful, privacy-first tool designed to protect your intellectual property. It transforms your readable source code into a difficult-to-reverse, scrambled version that functions exactly the same but is nearly impossible for humans to understand.
Features include variable renaming, control flow flattening, string encryption, and dead code injection. Unlike other obfuscators that process code on a remote server, this tool runs entirely in your browser using WebAssembly and JS.
Example
Input: The source text, file, or settings you want to work with.
Output: A clean javascript obfuscator result ready for the next step.
If JavaScript Obfuscator is close but not quite the right fit, these related Nextooly tools cover adjacent developer & code workflows without sending you to another service.
Best if you need to test regular expressions against sample text.
Best if you need to encode and decode Base64 safely in your browser.
Best if you need to compute SHA-256, SHA-1, and MD5 hashes for text and files.
Does this tool upload my JavaScript code to any server?
No. The obfuscation process happens entirely inside your web browser using client-side libraries. Your code never leaves your computer.
Will obfuscated code run slower than my original code?
Yes, slightly. Advanced protections like 'Control Flow Flattening' and 'String Encryption' add extra steps for the browser to execute. For most applications, the performance difference is negligible, but avoid heavy obfuscation on performance-critical loops.
Can obfuscated code be reversed or decompiled?
Obfuscation makes code extremely difficult to read, but not impossible to reverse-engineer with enough time and effort. It stops casual copying and theft, but it is not a replacement for server-side security.
What does 'Control Flow Flattening' do?
It transforms the structure of your code (loops, if-statements) into a complex switch-statement structure. This destroys the visual shape of your logic, making it very confusing for humans to follow.
Why does the file size increase after obfuscation?
Obfuscation adds dummy code, wrapper functions, and expanded logic to hide the real intent of your script. This naturally increases the file size compared to the original or minified version.
Does this tool also minify my code?
Yes. By default, the 'Compact' option is enabled, which removes whitespace and comments, effectively minifying the code while it obfuscates it.
Can I use this for Node.js applications?
Yes. You can select 'Node.js' from the Target Environment dropdown to ensure the obfuscated code is compatible with server-side environments.
2026-03-10
Related tools
Related category
Related comparison/alternatives article