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JavaScript Obfuscator — Free Browser-Based JS Code Protection

Obfuscate JavaScript with control-flow flattening, string array, dead-code injection and identifier mangling. Three presets, runs in your browser.

Free No signup Client-side Privacy friendly Updated
Preset

Working…

How to use

  1. 1 Paste your JavaScript source on the left.
  2. 2 Pick a preset — low (light mangling), medium (default), high (control flow + dead code).
  3. 3 Click Obfuscate. Copy or download the result.

Why use this tool

  • Powered by javascript-obfuscator, the open-source library used by many SaaS builders.
  • Library is lazy-loaded — the page is light until you click Obfuscate.
  • Three preset profiles and fine-grained toggles for individual passes.
  • Pure client-side — your source code never leaves the browser.

Frequently asked questions

Is obfuscated code unreadable?

It is much harder to read but never impossible — determined attackers can still reverse it. Use obfuscation in combination with proper licensing, server-side validation, and minification.

Want minified output instead?

Try the <a class="underline" href="/javascript-minifier">JavaScript Minifier</a> — same lazy-loading pattern, faster output, no name mangling beyond shortening.

Need to format obfuscated code?

Use the <a class="underline" href="/javascript-formatter">JavaScript Formatter</a> to pretty-print and inspect the structure.

What is JavaScript Obfuscator?

A JavaScript Obfuscator is a tool that transforms JavaScript source into a functionally equivalent but harder-to-read form. It applies techniques such as control-flow flattening, string array extraction, dead-code injection, and identifier mangling, and offers three presets. It runs entirely in the browser, so source code is processed client-side and never uploaded to a server.

Features

Preset strength

Low, medium, and high presets trade readability protection against runtime overhead.

Name & string mangling

Renames identifiers and moves string literals into an encoded array.

Honest about limits

Obfuscation deters casual reading — it is not encryption and does not hide secrets.

100% private

Runs client-side — your source never leaves the browser.

Example

Input

function greet(n){ return "Hello, " + n; }

Output

var _0x3f2a=["Hello, "];function greet(_0x1b){return _0x3f2a[0]+_0x1b;}   (representative — exact output varies by preset and library version)

Common use cases

  1. 1

    Deter casual copying

    Make client-side JavaScript harder to read and lift verbatim.

  2. 2

    Protect logic lightly

    Raise the effort needed to understand widget or snippet internals.

  3. 3

    Shrink and mangle

    Combine compaction with name mangling for smaller, opaque output.

Summary

Zerethon's JS obfuscator transforms JavaScript into functionally-equivalent but hard-to-read code using the javascript-obfuscator library, entirely in your browser. Low/medium/high presets control string-array encoding, control-flow flattening, and dead-code injection. Obfuscation raises the effort to reverse-engineer code but is NOT encryption or real security — a determined reader can still recover behavior. Nothing is uploaded.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. JavaScript Obfuscator runs entirely client-side — no server upload, no logging, no tracking of your input.

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