JavaScript Obfuscator
Protect your JavaScript from copying and tampering. Variables are renamed, strings are encoded and the code flow is scrambled — and it still runs exactly the same.
Runs in your browser — your code is never uploaded. Tip: drop a file on the input box, or press Ctrl + Enter.
How to Obfuscate JavaScript
Protect your code in three steps.
Paste or Upload JS
Paste your JavaScript or upload a .js file.
Choose Protection
Pick a preset and string encoding. Add control-flow scrambling and dead code for extra protection.
Obfuscate & Test
Click Obfuscate JS, download the file, and test it before you publish.
Renames
Variables & functions
Encodes
Strings (Base64 / RC4)
Scrambles
Control flow
Privacy
Runs in your browser
Works on
Phone & computer
Price
100% free
Protection Options and Their Cost
More protection makes code bigger and a little slower — choose what you need.
| Option | What it does | Size / speed |
|---|---|---|
| Low preset | Renames variables and compacts the code | Small, fast |
| Medium preset | Adds a hidden, rotated string array | Medium |
| High preset | Also splits strings, hides numbers and object keys | Bigger, slower |
| String encoding: RC4 | Strings are encrypted and decoded at run time | Slower than Base64 |
| Scramble control flow | Rewrites if/loops into a switch maze | Up to 1.5× slower |
| Add dead code | Inserts fake code blocks | Bigger file |
What Can You Use It For?
Popular ways people use JavaScript Obfuscator.
Protect Your Work
Make it harder to copy paid scripts, widgets and games.
Hide Logic
Make licence checks and business rules harder to find.
Browser Games
Make cheating by editing the code harder.
Plugins & Embeds
Ship code to clients without readable source.
Tips for the Best Result
- Always keep your original code — obfuscated code cannot be turned back into the original.
- Never put passwords or secret API keys in front-end JavaScript; obfuscation slows people down but cannot fully hide them.
- Start with Medium; use High and control-flow scrambling only for the most sensitive files.
- Want a smaller file instead? Use the JS Minifier.
Frequently Asked Questions
Quick answers about JavaScript Obfuscator.
Changing code so it is very hard for people to read and understand, while the browser runs it exactly the same.
Yes. Global names are not renamed, so other scripts can still call your functions. Always test before publishing.
Formatting and simple strings can be partly recovered, but renamed variables and scrambled flow cannot be fully undone. It slows down copying — it is not encryption.
The open-source javascript-obfuscator library, running in your browser.
A little. Low and Medium add very little cost; control-flow scrambling and High can make code bigger and slower.
Minify to make files smaller and faster. Obfuscate when you need to protect the code. Obfuscated code is already compact.
No. Everything runs in your web browser, so your code and data never leave your device.
Yes — 100% free, with no sign-up and no limits.
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