Third Party Script Checker

Paste HTML code and instantly detect all external scripts. Identify domains, analyze security risks, and understand what's running on your page.

Paste Your HTML

Total Scripts
0
External Scripts
0
Unique Domains
0
Risk Level
—

Risk Assessment

What Are Third-Party Scripts?

Third-party scripts are external JavaScript files loaded from domains other than your own. They're commonly used for analytics, advertising, customer support, and other functionality—but they can impact performance and security.

Common third-party script sources include Google Analytics, Facebook Pixel, Stripe, Intercom, and countless advertising networks.

How This Tool Works

Simply paste your HTML code, and the tool will:

  1. Extract all <script> tags
  2. Identify internal vs. external scripts
  3. Extract domains and categorize by purpose
  4. Flag suspicious or high-risk scripts
  5. Provide security and performance insights

Your data never leaves your browser—all analysis is 100% private and client-side.

Common Third-Party Script Categories

Analytics & Tracking

Advertising

Customer Support & Chat

Payment & E-commerce

Why Check Third-Party Scripts?

Performance Impact

Each external script can delay page load, increase bundle size, and harm Core Web Vitals. Understanding what you're loading helps optimize your site's speed.

Security & Privacy

Unknown or outdated scripts can introduce vulnerabilities. Reviewing your third-party dependencies ensures you're not exposing user data to untrusted sources.

User Privacy

Tracking scripts collect user behavior. Being aware of what data is being collected helps maintain user trust and comply with privacy regulations.

Frequently Asked Questions

Is my code private?

Yes. This tool runs 100% in your browser. No HTML is sent to any server. Your data never leaves your device.

What scripts should I be concerned about?

Be cautious of scripts from unknown domains, unverified CDNs, or sources that load other scripts dynamically. Regularly audit your script dependencies.

How many third-party scripts is too many?

There's no magic number, but each script adds overhead. A good practice is to minimize external dependencies and consolidate where possible (e.g., use one analytics platform instead of three).

Can I use this on minified or production HTML?

Yes. The tool analyzes the raw HTML structure regardless of whether it's minified, prettified, or generated from a framework.

What does "async" mean?

An async script loads in parallel without blocking page rendering. This is generally better for performance than synchronous scripts.