Maximum protection in every paid tier — protect more code from $29/mo · Compare plans
Try the online obfuscator Free hosted preview · no signup · desktop option for local processing
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Online + desktop JavaScript protection since 2004

JavaScript Obfuscator

Protect the browser JavaScript your customers download. Start with a fast online test in the JS obfuscator, move larger and mixed-file projects to the desktop app, and use published evidence paths when security, PCI, or procurement teams ask how the workflow is handled.

Try Online Free Download Desktop Plans From $29/month › Security Evidence ›
Or protect a file from your terminal
$npx javascriptobfuscator-com app.js

No account, no install step. Free tier covers up to 20 files and 200 KB per request. npm and CI docs ›

Online + desktop Test a sample in the browser, then protect folders and embedded scripts locally. Published pricing Start free and move to paid plans when quota, file size, or stronger protection matters. Runtime + PCI evidence Export source-free incident, checkout, and QSA handoff artifacts. Clear boundaries Source-free packets avoid code, output, tokens, and secrets; SOC and native shielding stay separate.
Before you publish

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

Readable JavaScript on the left transformed by JavaScript Obfuscator into protected, unreadable code on the right
Try Protect a small sample online.
Protect Use the desktop app for projects.
Validate Rerun your tests on protected output, then publish.
2004 Protecting JavaScript for more than two decades. Heritage
Plans from $29 Entry paid plan includes more quota and stronger protection. Pricing
Runtime + PCI First-triage monitoring and payment-page evidence paths are documented. Evidence
VM proof Sample proof packs show advanced protection evidence and limits. Review
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, then validate the protected build with the same tests you trust before release.
One file or quick testOpen the browser tool and see protected output immediately. Project on my computerUse the desktop app for folders, larger files, and local source. Compatibility validationMake protection a release gate: protect the built bundle, rerun its tests, then publish only when both builds pass. Security and deployment evidenceReview runtime behavior, VM proof, source handling, and payment-page controls before a technical review.
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/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.

Open Maximum Preset › Download Desktop App Security Evidence
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 → 1 GB / month
Smaller plans elsewhere
$19 → 100 MB

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

Start free

Free

$0/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
Get Started Free
Individual projects

Basic

$29/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
Choose Basic
Most popular

Corporate

$49/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
Choose Corporate
High-volume use

Enterprise

$99/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
Choose Enterprise

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.
Try Online Obfuscator Download Desktop App Compare Plans Security Evidence

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.
Learn How It Works › Try A Sample
Trust

Know where your code is handled.

Use the online tool for quick tests. WinUI Local Standard protects basic ES5 .js offline; paid Local Advanced keeps modern .js/.jsx and mixed HTML/server-script source on-device after an online plan check, and writes the protection report locally. VM bytecode protection uses the service.

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 for visual batch and mixed-file projects.
No magic claims Obfuscation raises the effort to understand code. It does not replace server-side authorization or access control.
Open Security Evidence Security & Trust Download Desktop App
Desktop App

Protect whole projects from your Windows desktop.

Use the Windows desktop app when you need to protect many files. Local Standard keeps basic ES5 .js offline; paid Local Advanced keeps modern .js/.jsx and mixed HTML/PHP/ASP/ASPX source on-device after an online plan check. VM bytecode protection uses the hosted service.

Protect full folders instead of one file at a time Works with embedded JavaScript in common web files Local Standard protects basic ES5 .js fully offline
Download Desktop App › Take a Tour ›
JavaScript Obfuscator Desktop GUI
Projects Protect folders and embedded scripts
Presets Reuse the same protection choices
Local mode Basic ES5 protection stays offline
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.

Try the online obfuscator

Best when you want a fast before-and-after preview, a quick shareable test, or a lightweight way to compare presets.

Open the browser tool ›

Download the desktop app

Best when you need larger projects, visual batch processing, or embedded JavaScript support.

Get the desktop installer ›

Choose a paid plan

Best when the free limits are too small or you want Maximum protection for production code.

Compare plans ›

Open security evidence

Best when a buyer, security reviewer, or procurement owner asks for runtime, payment, VM, source-handling, and competitor-gap evidence. Source-free packets avoid code, output, tokens, and secrets; SOC and native shielding stay separate.

Open evidence hub ›

From the engineering team

All articles
Vendor Comparison ~10 min read

How JavaScript protection products compare

A plain-English look at protection levels, pricing styles, and when a heavier security platform may make sense.

Read the comparison ›
Beta Design ~8 min read

What stronger protection means for high-value code

How deeper protection can make important browser logic harder to understand, copy, and modify.

Read the design ›
AI And Code Copying ~9 min read

Can AI tools explain protected JavaScript?

What AI tools can and cannot do when names, strings, and code structure have been intentionally hidden.

Read the analysis ›
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/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 WinUI Local Standard to keep basic ES5 .js fully offline, or paid Local Advanced to keep modern .js/.jsx and mixed HTML/server-script source on-device after an online plan check, with the protection report written locally. VM bytecode protection uses the service.
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 Obfuscator ›