What this tool does
JS Obfuscator
Your input is sent to the server for this request and is not saved as a tool content record. Infrastructure logs may still record request metadata, so do not submit secrets.
JS Obfuscator can compact output, rename simple local declarations, encode simple strings with atob(), and preserve function or class names. It processes code as text and does not execute it.
Obfuscation is not encryption. API keys, credentials, signing material, and any other secret delivered to a browser remain accessible to a determined user.
How to use this tool
How to obfuscate JavaScript
Paste JavaScript into the source field.
Choose compaction, local renaming, string encoding, name preservation, and aggressive mode.
Select Obfuscate JS and read every warning.
Test the output in the target application while keeping the original source under version control.
Before and after example
JavaScript obfuscation example
Input
function greet(name) {
const message = 'Hello ' + name;
return message;
}Output
function greet(name){const _dh0='Hello '+name;return _dh0;}Options, errors, and limitations
Obfuscation options and security limits
Parent category
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Practical guides
Troubleshoot and choose the next step
FAQ
JS Obfuscator FAQ
Does JavaScript obfuscation make my code secure?
No. Obfuscation increases the effort required to understand code, but anyone who receives browser JavaScript can still inspect, execute, instrument, and reverse engineer it. Secrets and authorization logic must stay on trusted server side systems.
What is the difference between obfuscation and minification?
Minification is mainly intended to reduce file size, while obfuscation intentionally makes code harder to read through transformations such as renamed identifiers, encoded strings, or control flow changes. Some tools combine both.
Can obfuscation slow down JavaScript?
Yes. Aggressive transformations can increase code size, startup work, and runtime complexity. Measure performance after obfuscation, especially for code that runs during page load or frequent user interactions.
Why is obfuscated code harder to debug?
Variable names, function names, line structure, and control flow may no longer resemble the original source. Keep the readable source and consider private source maps or a separate debug build for troubleshooting.
Should I publish source maps for obfuscated JavaScript?
Public source maps can undermine the purpose of obfuscation by exposing readable source structure. If you need source maps for error monitoring, restrict access or use a monitoring service that accepts private source maps.
Can I hide API keys or passwords by obfuscating them?
No. A secret needed by browser code can eventually be recovered from the browser, network requests, memory, or the obfuscated bundle. Use server side proxies, short lived tokens, and proper access controls instead.
Can obfuscated JavaScript be deobfuscated?
Often yes, at least partially. Beautifiers, debuggers, static analysis, runtime instrumentation, and manual reverse engineering can recover meaningful logic even when the exact original source cannot be reconstructed.
Can obfuscation break a framework or library?
It can if aggressive renaming or transformation affects identifiers used through reflection, dependency injection, serialization, dynamic property access, or external APIs. Test the exact production bundle across supported browsers.
Does obfuscation protect software licensing?
It can discourage casual copying, but it cannot provide strong license enforcement by itself. Licensing should also rely on legal terms, server controlled entitlements, account authorization, or signed license data.
Which code should remain on the server instead of being obfuscated?
Keep secrets, payment rules, permission checks, anti fraud logic, proprietary scoring, and any logic that must be trusted on the server. Client code can improve the user experience, but the server must enforce security decisions.