JS Code Obfuscator

• Free online JavaScript code obfuscator. It supports control flow flattening, string obfuscation, dead code injection, and variable/function name obfuscation to make your code hard to reverse-engineer.
• It can also format and restore minified or obfuscated code into a readable style. Ideal for frontend code protection, anti-reverse-engineering of commercial apps, and open-source security hardening.

1. Open the tool page — no download or installation is needed.
2. Paste the JavaScript code to process, choose "Obfuscate Code" or "Format & Restore" mode, and adjust the obfuscation options or a strength preset.
3. Click "Start Obfuscation" (or "Format & Restore" for that mode) to generate the result, then use "Copy Result" or "Download File" to save it.

• The tool is completely free and requires no sign-up or login.
• All processing runs locally in your browser — your code is never uploaded to any server.

Free online JavaScript code obfuscation tool, supports multiple obfuscation techniques including control flow flattening, string obfuscation, dead code injection, variable name obfuscation, to protect your JavaScript code security. Suitable for frontend code protection, commercial application anti-reverse engineering, open source project security hardening and other scenarios.

Open the tool page — no download or installation is needed. Paste the JavaScript code to process, choose "Obfuscate Code" or "Format & Restore" mode, and adjust the obfuscation options or a strength preset. Click "Start Obfuscation" (or "Format & Restore" for that mode) to generate the result, then use "Copy Result" or "Download File" to save it.

The tool is completely free and requires no sign-up or login. All processing runs locally in your browser — your code is never uploaded to any server.

Yes, JS Code Obfuscator is completely free. No download or installation required — it runs right in your browser.