Test, Monitor & Improve Your Website Performance
Free website performance testing powered by Google Lighthouse. Analyze speed, SEO, accessibility, best practices, Core Web Vitals and more.
Free • No Registration Required • Lighthouse Powered
Everything You Need to Optimize Your Website
Comprehensive testing tools to help you build faster, more accessible, and SEO-friendly websites.
Performance Testing
Get detailed performance scores and metrics including Core Web Vitals, load times, and optimization opportunities.
SEO Auditing
Comprehensive SEO analysis with actionable fixes for meta tags, headings, links, structured data and more.
Accessibility Check
WCAG compliance testing and recommendations to make your website accessible to everyone.
Core Web Vitals
Monitor LCP, INP, CLS and other vital metrics that impact user experience and search rankings.
Website Monitoring
Track performance over time with automated checks and alerts when your site slows down.
PDF Reports
Download and share professional audit reports with your team or clients.
What Is My IP
See your public IPv4 or IPv6 address and look up any address's location, ISP and ASN.
How It Works
Get a comprehensive website analysis in three simple steps.
Enter Your URL
Simply paste your website URL into the test field above. We support any publicly accessible website.
We Analyze Your Website
Our servers run a Lighthouse audit, analyzing performance, SEO, accessibility, and best practices.
Get Actionable Results
Receive a detailed report with scores, metrics, issues, and specific recommendations for improvement.
Recent Tests
See what others have been testing.
Frequently Asked Questions
Everything you need to know about W3Test.
W3Test is a free, comprehensive website performance testing tool powered by Google Lighthouse. It analyzes your website's speed, SEO, accessibility, best practices, and Core Web Vitals to help you identify issues and improve your site.
Yes, W3Test is completely free to use. There are no hidden fees or registration requirements. You can run unlimited tests and generate reports at no cost.
Google Lighthouse is an open-source, automated tool for improving the quality of web pages. It provides audits for performance, accessibility, progressive web apps, SEO, and more. W3Test uses Lighthouse as its core testing engine.
We recommend testing your website at least once a week. If you make regular updates, test after each major deployment. Use our monitoring feature for automated, scheduled testing.
Core Web Vitals are a set of specific factors that Google considers important in a webpage's overall user experience. They include Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS). These metrics directly impact your search rankings.
W3Test can only test publicly accessible URLs. For local development testing, we recommend using Lighthouse directly in Chrome DevTools or running a local Lighthouse server.
Our tests use Google Lighthouse, which is the industry standard for web performance testing. Results may vary slightly based on server response times, network conditions, and geographic location. We recommend running multiple tests and averaging the results.
Yes, you can download any test report as a PDF file. Simply click the "Download PDF" button on any report page. PDF reports are perfect for sharing with your team or clients.
Ready to Test Your Website?
Get a comprehensive performance report in seconds. Identify issues and start improving today.