Maximum protection in every paid tier — protect more code from 29ドル/mo · Compare plans
Try the online obfuscator Free preview · no signup · in your browser
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The original JavaScript obfuscator · trusted since 2004

The best way to protect the JavaScript your customers download.

Your browser code is visible to anyone who opens the page. JavaScript Obfuscator makes that code difficult to read, copy, modify, and reuse while keeping it working for real customers. Try it online in seconds, then move to the desktop app when a real project should stay on your computer.

Fast online test Paste code, choose a preset, and see protected output immediately. AI-assisted protection Get preset help, compatibility checks, and plain-English error explanations. Compatibility evidence Tracked against real-world library samples including React, Vue, Three.js, and more. No source recovery Obfuscation is designed to make the original code impractical to reconstruct.
Before you publish

Turn readable JavaScript into protected code that is far harder to understand, copy, or tamper with.

Try Protect a small sample online.
Protect Use the desktop app for projects.
Publish Release code that is harder to copy.
2004 Protecting JavaScript for more than two decades. Heritage
29ドル = 1 GB Entry paid plan with stronger protection included. Pricing
Library audits Real-world samples are logged so compatibility gaps are visible. Evidence
AI built in Preset suggestions, compatibility checks, error explanations. JSO AI
Trusted by product teams worldwide Well-known organizations have used JavaScript Obfuscator to help protect code they publish.
Sony
Intel
Nokia
Siemens
IBM
Microsoft
What do you need to protect today? Pick the path that matches the job. You can change tools later without changing the protection engine.
Find Your Fit

Choose the reason you want protection.

Different projects need different levels of protection. Start with the situation that sounds closest to yours.

Recommended: Standard preset. A good first step when you want to make public code harder to copy and edit. The Free tier is enough to test it — no credit card required.

Open Standard Preset ›

Recommended: Maximum preset. Use the strongest preset when your code contains valuable business logic, pricing rules, licensing checks, or other work you do not want competitors to study. Available in every paid tier from 29ドル/month.

Open Maximum Preset ›

Recommended: Desktop app + Maximum preset. Use the desktop app when you need to protect larger folders, repeat the same settings, or keep sensitive source code on your own workstation.

Pricing

Simple plans for small tests, real projects, and larger teams.

Start free, then upgrade when you need more monthly capacity, larger files, or stronger protection. Pricing is published, so you can choose without a sales call.

Entry paid plan

JavaScript Obfuscator
29ドル → 1 GB / month
Smaller plans elsewhere
19ドル → 100 MB

Protect more code each month, with Maximum protection included from 29ドル.

Start free

Free

0ドル/month

Try the engine on real code with no credit card. Best for evaluation and single-file scripts.

Free forever

  • 200 MB / month
  • Up to 20 files per request
  • Name mangling
  • String encoding
  • Browser-based tool only
Individual projects

Basic

29ドル/month

For people protecting real project files, not just trying a quick online sample.

Best for individual projects

  • 1 GB / month · 5× Free
  • Up to 50 files per request
  • 10 MB max file size
  • Maximum protection
  • Domain & date locking
  • Desktop app access
Most popular

Corporate

49ドル/month

For teams protecting larger projects with shared settings and stronger controls.

Best for production teams

  • 3 GB / month · 3× Basic
  • Up to 1000 files per request
  • 30 MB max file size
  • Replace globals + protect members
  • Dead-code insertion
  • Advanced protection options
High-volume use

Enterprise

99ドル/month

The largest monthly quota and deepest protection options for bigger organizations.

Best for large projects

  • 9 GB / month · 3× Corporate
  • Up to 3000 files per request
  • 120 MB max file size
  • Flat transform + encrypted strings
  • Embedded JavaScript file support
  • Move-nested + best compression

Compare all four plans in detail ›

How To Use It

Start small, then protect full projects when you are ready.

You do not need to redesign your website to use JavaScript Obfuscator. Try a short sample online, choose the protection level that fits, and use the desktop app when you need to protect more files at once.

Preview online Paste a small piece of JavaScript, choose a preset, and see how the protected result looks before changing anything else.
Choose a preset Use Standard for basic copy resistance, Balanced for stronger everyday protection, or Maximum for high-value production code.
Move to desktop Protect folders, larger projects, and embedded JavaScript files from a local Windows app when the online tool is no longer enough.
Best for Web apps, commercial widgets, licensing checks, client-side business logic, dashboards, games, and scripts you do not want copied easily.
What to expect The protected code still runs in the browser, but it becomes much harder to read, rename, understand, or modify.

What Protection Changes

Readable browser code becomes hard-to-follow protected code.

JavaScript still has to run in the browser. Obfuscation helps by removing the easy clues people use to understand and reuse it.

Meaningful names disappear. Helpful names like totals, discounts, checks, and user state are replaced with hard-to-read identifiers.
Important strings are hidden. Text values and clues that make code easy to search are encoded before the file is published.
The structure is harder to follow. Maximum protection changes how code flows, making casual reading and quick modification much more difficult. 
// Before:
function calculateDiscount(customer) {
 return customer.loyaltyLevel * 0.05;
}
// After protection:
var _0x31a=function(_0x4bd){...};
_0x31a('0x2f')[_0x31a('0x14')](_0x31a('0x08'));
Trust

Know where your code is handled.

Use the online tool for quick tests. Use the desktop app when you want source code to stay on your workstation. Either way, the product is clear about what it does and what it does not claim.

Online test available Desktop app available Published pricing
Online for samples Paste code into the browser tool when you want a fast preview.
Desktop for sensitive work Use the Windows app when you prefer to keep source files local.
No magic claims Obfuscation raises the effort to understand code. It does not replace server-side authorization or access control.
Desktop App

Keep sensitive source code on your own computer.

Use the Windows desktop app when you prefer local processing, need to protect many files, or work with JavaScript embedded in HTML, PHP, ASP, ASPX, or JSP pages. It is the easiest next step after a successful online test.

Protect full folders instead of one file at a time Works with embedded JavaScript in common web files Keep sensitive source code on the workstation
JavaScript Obfuscator Desktop GUI
Projects Protect folders and embedded scripts
Presets Reuse the same protection choices
Local Source stays on the local workstation
Start Here

Choose the easiest next step.

Most people start online, then move to the desktop app when they need to protect a real project. Paid plans add more monthly capacity and stronger protection.

From the engineering team

All articles
Frequently Asked

Common questions before you protect JavaScript.

Plain answers about what obfuscation does, what it cannot do, and which version to use first.

Can AI tools or people still read my protected JavaScript?
Obfuscation makes the code much harder to understand. It removes useful names, hides strings, and changes the structure of the file. It is not a promise that no one can ever study the code, but it raises the effort dramatically compared with publishing readable JavaScript.
Is the original source recoverable from the obfuscated output?
No. The protected output does not contain your original comments, names, and readable structure. Anyone viewing the published file sees the transformed version, not a clean copy of your source.
Can it protect JavaScript embedded in HTML, PHP, ASP, ASPX, or JSP files?
Yes. The desktop app can process mixed web files, including JavaScript inside HTML, PHP, ASP, ASPX, and JSP templates.
Is Maximum protection included in the lower-priced plans?
Yes. Maximum protection is available in every paid tier starting at 29ドル/month. You do not need an enterprise plan to use the strongest preset.
Should I use the online tool or the desktop app?
Use the online tool for a quick test or small file. Use the desktop app when you need to protect larger folders, embedded scripts, or source code you prefer to keep on your own computer.
Will obfuscation break my code or hurt runtime performance?
Obfuscation is designed to preserve behavior, but you should always test protected code before publishing it. Stronger settings can add some overhead, so choose the level that fits your project and test the final protected files in the browser.

Still have a question? Email [email protected] or start with a free online test.

Try Online ›