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WebPageTest. The gold standard in web performance testing.

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Lightning-Fast Web Performance

Online CourseLearn to analyze performance, fix issues, and deliver fast websites from the start.

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Introducing Carbon Control Experimental

New in WebPageTest! Measure your site's carbon footprint and run No-Code Experiments to find ways to improve.

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All of the WebPageTest features you already love, plus API Access & No-Code Experiments!

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Start a Visual Comparison Test!

Enter multiple URLs to compare them against each other visually.

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For each URL, 3 first-view tests will be run from 'Virginia - Chrome' and the median run will be used for comparison. If you would like to test with different settings, submit your tests individually from the main test page.

Trusted by the world's top brands

“The best professional web performance investigators I know use WPT as a critical part of their workflows, and it's the center or mine.”

Alex Russel Program Manager, Microsoft Edge

Real Experience

Test your user’s real experience with global locations, modern devices, and the latest browser versions.

Video Capture

Correlate your user’s visual experience to the technical measurements of your site.

In-Depth Metrics

Dive into the anatomy of your webpage with components like DNS, TCP, TLS, and more.