How to use Site Speed Test Mobile
- Paste or load a Lighthouse JSON report (or paste it) into Site Speed Test Mobile.
- Hit Read report and Site Speed Test Mobile computes the result client-side.
- Read the category scores and Core Web Vitals that Site Speed Test Mobile lays out for you.
About this tool
Site Speed Test Mobile is a static, client-side tool with no backend. Export a report from Chrome DevTools or PageSpeed Insights and load the JSON into Site Speed Test Mobile to see the scores locally.
It shows category scores and Core Web Vitals such as LCP, CLS and TBT, read straight from the JSON. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
What is Site Speed Test Mobile for?
Use Site Speed Test Mobile to check your input without installing anything; everything happens client-side.
Does Site Speed Test Mobile cost anything?
No — Site Speed Test Mobile is completely free, with no sign-up and no hidden limits.
Is my input private in Site Speed Test Mobile?
Yes — your input never leaves your device; Site Speed Test Mobile does all the work in your browser.
What file does Site Speed Test Mobile read?
Export a Lighthouse or PageSpeed Insights JSON report and load it into Site Speed Test Mobile; it surfaces the scores and Core Web Vitals locally.
Does Site Speed Test Mobile work on mobile?
Yes — Site Speed Test Mobile is just a web page and runs on any modern browser, including phones and tablets.