Can ChatGPT, Claude, or Copilot reverse-engineer code protected by JavaScript Obfuscator?
Maximum-mode protection is built specifically against LLM-assisted reverse engineering. Every build emits a different decoder shape, key derivation routine, identifier prefix, and constant-pool encoding. LLMs work by pattern-matching against known transform signatures — Maximum mode regenerates the signature on every release, so an AI deobfuscator that "solves" one build can't apply the same approach to the next. The protected output also exposes no readable strings, identifiers, or control-flow shape for an LLM context window to anchor on. Read the long-form technical answer or the Maximum-mode mechanism breakdown.
Does JavaScript Obfuscator support VM-based bytecode protection?
Yes — selective per-function VM virtualization is shipping in v3.2 for Corporate and Enterprise tiers. You mark functions to virtualize with a // @virtualize comment; the marked function is compiled to bytecode for a custom per-build VM and replaced in the output with a JS interpreter that executes those opcodes at runtime. The flag (UseVMProtection) and the tier gate are live today; the virtualizer itself activates in v3.2. VM protection docs, design rationale, vendor comparison.
When should I use VM protection vs Maximum mode?
Use VM protection on cold paths where the algorithm is the asset — license validation, anti-tamper checks, key derivation, watermarking. The runtime cost of virtualized code is roughly 80× native JavaScript per instruction, so a hot rendering loop or animation tick handler should not be virtualized. Maximum mode (per-build polymorphic transforms, encrypted constants, flat control flow) runs at near-native speed and is the right baseline for the rest of the bundle. The two are complementary, not alternatives — you mark only the functions that benefit from virtualization, the rest of the bundle gets standard Maximum-mode protection.
Is JavaScript Obfuscator compatible with ES6 or ES8?
Yes. JavaScript Obfuscator is compatible with ES6 and ES8, and new engine support continues to be added over time.
Is it possible to recover the original file from an obfuscated version?
No. Once the symbols and comments are transformed, the original source cannot be recovered from the obfuscated output — not by hand, not by automated deobfuscators, not by LLM-based tools. Keep your original source files in a safe place.
Can JavaScript Obfuscator protect JavaScript that is embedded in HTML?
Yes. JavaScript Obfuscator Desktop can also protect JavaScript embedded in HTML, PHP, ASP, ASPX, JSP, and similar files.
Does JavaScript Obfuscator optimize for speed?
In many cases, smaller code is faster code because download time is a major performance factor. Reducing redundancies can also help runtime efficiency.
Are there any restrictions on the size of the files that can be obfuscated?
JavaScript Obfuscator Desktop does not have a maximum file size limit for your project files.
Can I keep an exclude list of variables and functions that should not be obfuscated?
Yes. JavaScript Obfuscator Desktop lets you create a list of names with specific settings so selected variables and functions can remain unchanged.
My project has several files that call functions in each other. Will JavaScript Obfuscator protect it correctly?
Yes. The protected version of the same symbol stays consistent across every file in your project.
Where does JavaScript Obfuscator fit in a modern build or release process?
The strongest fit is after your application has already generated the JavaScript files you plan to ship. Use the online obfuscator for quick validation, then move into the desktop project and generated command-line workflow when you want larger releases, repeatable automation, or embedded JavaScript support.
Can I automate obfuscation in CI or release scripts?
Yes. The desktop app can generate a command line from the project settings you already configured, which is the recommended path for repeatable build and release automation.
Do you keep my JavaScript source code?
No. Source code obfuscation is processed in server memory, and you do not need to upload JavaScript files to the server. For more details, please review the Terms of Service and Privacy Policy.