JS Obfuscator
100% LocalObfuscate JavaScript code with variable renaming, string encoding, and dead code injection.
264 chars
Paste JavaScript code. Variable names get renamed and control flow gets restructured for obfuscation.
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What is JS Obfuscator?
Frequently Asked Questions
Technical Deep Dive
JS Obfuscator
Obfuscate JavaScript code client-side using multiple techniques: variable renaming to hex identifiers, string literal unicode/hex encoding, number to hex conversion, dead code injection, and self-defending code. Toggle each technique individually. Minify before obfuscating for maximum compactness. Download the obfuscated output as a .js file.
Name mangling & string hiding
Renames identifiers, moves string literals into a lookup array, and can inject dead code and control-flow flattening.
Obfuscation, not encryption
The page is explicit that anyone can still run a deobfuscator — use it to raise the bar, never to hide secrets or licence checks.
Runs on your source
Your JavaScript is transformed in the browser. Proprietary code is never uploaded to a build service.
01 Transformation Layer Matrix
| Layer | Technique | Security Impact | Payload Size |
|---|---|---|---|
| Level 1 | Minification & Renaming | Low (Basic Hiding) | Decreased |
| Level 2 | String Array Encoding | Medium (Data Hiding) | Stable |
| Level 3 | Control Flow Flattening | High (Logic Hiding) | Increased |
| Defense | Self-Defending Checks | Anti-Tampering | Stable |
02 Obfuscation Pipeline Workflow
03 When to Obfuscate (and When Not To)
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License enforcement in commercial SDKs If you distribute a paid JavaScript library or SDK, obfuscation makes casual piracy significantly harder. Combined with server-side license validation, it raises the cost of circumvention above most attackers' tolerance threshold.
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Anti-tampering for client-side validation Games, anti-cheat systems, and financial calculators benefit from obfuscation to prevent users from modifying client-side logic. Self-defending code can detect debugger attachment and halt execution.
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Never for security-critical secrets API keys, database credentials, and encryption keys must NEVER be embedded in client-side JavaScript, obfuscated or not. Any value in the browser's memory can be extracted via DevTools. Use server-side proxies and environment variables instead.
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Performance tradeoff awareness Heavy obfuscation (dead code injection + string array encoding + self-defending) can increase file size by 200-400% and add 50-200ms to parse time. Always benchmark with Lighthouse before deploying obfuscated bundles to production. Consider obfuscating only sensitive modules, not your entire application.
04 Related Tools
Obfuscation is one layer in a broader code protection and optimization workflow. These tools handle adjacent concerns.
JS Beautifier
The reverse operation, format and indent minified or obfuscated code for readability and debugging.
JSON Minifier
Minify JSON payloads before embedding them in obfuscated code to reduce overall bundle size.
Hash Generator
Generate integrity hashes (SHA-256) for your obfuscated bundles to detect tampering via Subresource Integrity.