Code Obfuscator

🛡️ Code Obfuscator – Protect JavaScript, Python, HTML & CSS

The Code Obfuscator transforms human-readable source code into a functionally equivalent but intentionally difficult-to-understand version — entirely inside your browser. No code is ever uploaded to a server. It supports JavaScript, TypeScript, Python, HTML, and CSS with configurable transformation strategies ranging from simple comment stripping to multi-technique obfuscation chains.

Why Obfuscate Code?

Developers obfuscate code to deter casual reverse-engineering, protect intellectual property distributed in client-facing bundles, discourage scraping of proprietary algorithms, and reduce the surface area for competitor analysis. It is also a valuable educational tool — security researchers study obfuscation patterns used in malware and commercial software to sharpen deobfuscation skills.

Available Obfuscation Levels

• Low — Comment removal + whitespace stripping. Ideal as a quick minification pass that slightly obscures structure without aggressive transformation.
• Medium — Adds identifier renaming and number-to-hex conversion on top of Low. Variable and function names are replaced with _0xXXXX hex identifiers. Numeric literals like 255 become 0xFF.
• High — Adds string literal encoding (hex or unicode escapes) and dead code injection. All string constants are encoded so raw text searches no longer reveal their values. Syntactically valid but unreachable if(false){...} blocks are interspersed to confuse static analysis.
• Custom — Toggle each technique independently and combine them in any order you need.

Techniques Explained

Identifier Renaming

Every var, let, const, and named function declaration is collected, assigned a unique _0xXXXX name, and all occurrences are replaced throughout the file. The resulting Token Map (shown in the stats panel) documents every original → renamed pairing so you can trace the mapping if needed.

String Encoding

String literals are replaced with their escape-sequence equivalents. Choosing Hex escapes converts "Hello" to "\x48\x65\x6c\x6c\x6f"; Unicode escapes produce "\u0048\u0065\u006c\u006c\u006f". JavaScript engines interpret both forms identically at runtime, but keyword-searching the source yields nothing legible.

Dead Code Injection

Unreachable blocks such as if(false){var _nop=function(_x){return _x;}} are inserted at regular intervals. These statements are syntactically valid and parse without errors, but no JavaScript engine will ever execute them. They inflate code size and break naive structural-similarity comparisons.

Python Base64 Wrapping

When Encode Strings is enabled for Python, the entire script is base64-encoded and wrapped in:

import base64
exec(base64.b64decode("...").decode())

The resulting file runs identically to the original but requires manual decoding to inspect.

HTML / CSS Class Renaming

For HTML files, the tool detects class="..." and id="..." attributes and replaces each unique token with a short _cXXXX hash. CSS whitespace minification collapses multi-line stylesheets to a single compact string, reducing readability of selector hierarchies.

Understanding the Readability Score

The Readability Score (0–100) estimates reverse-engineering difficulty based on three signals:

• Presence of hex escape sequences (\x..) — +25 points
• Presence of unicode escape sequences (\u....) — +20 points
• Ratio of _0x identifiers to original word-length identifiers — up to +40 points

Scores of 0–30 are "Easy", 31–60 are "Moderate", and 61–100 are "Hard" to reverse-engineer at a glance.

Limitations & Best Practices

Browser-based pattern matching cannot replace a full Abstract Syntax Tree (AST) parser. Edge cases like destructuring assignments, shorthand object properties, template literals, and dynamic property access may not be fully renamed. For production-grade JavaScript protection, combine this tool with a bundler plugin such as javascript-obfuscator or terser's mangling options. Always keep an unobfuscated source backup — the transformations are not trivially reversible.

Privacy & Security

All processing is performed entirely in your browser using JavaScript. No source code, keys, or output are transmitted over the network. You can verify this by running the tool with your browser's network DevTools open — zero requests are made during obfuscation.