How to use Mobile Web Speed Test
- Add a Lighthouse JSON report (or paste it) to Mobile Web Speed Test to get started.
- Press Read report to run it locally in your browser.
- Review the category scores and Core Web Vitals shown below.
About this tool
Mobile Web Speed Test is a static, client-side tool with no backend. Mobile Web Speed Test reads a Lighthouse or PageSpeed Insights JSON report in your browser and surfaces the headline numbers without a server.
Because Mobile Web Speed Test parses a report you provide, the results match whatever run you exported. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
How do I use Mobile Web Speed Test?
Mobile Web Speed Test runs entirely on your device: add your input, and it checks it locally in real time.
Do I need an account for Mobile Web Speed Test?
No — Mobile Web Speed Test needs no account, sign-up or installation.
Where is my data processed by Mobile Web Speed Test?
Entirely in your browser — Mobile Web Speed Test keeps your data on your own machine and sends nothing anywhere.
What file does Mobile Web Speed Test read?
Export a Lighthouse or PageSpeed Insights JSON report and load it into Mobile Web Speed Test; it surfaces the scores and Core Web Vitals locally.
Does Mobile Web Speed Test work on mobile?
Yes — Mobile Web Speed Test is just a web page and runs on any modern browser, including phones and tablets.