How to use Web Speed Test
- Paste or load a Lighthouse JSON report (or paste it) into Web Speed Test.
- Click Read report — Web Speed Test processes everything on your device.
- Use the category scores and Core Web Vitals Web Speed Test produces — nothing was uploaded.
About this tool
Web Speed Test is a static, client-side tool with no backend. Export a report from Chrome DevTools or PageSpeed Insights and load the JSON into Web Speed Test to see the scores locally.
Because 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
What is Web Speed Test for?
Web Speed Test lets you check your input right in the browser, with the result shown instantly and nothing uploaded.
Do I need an account for Web Speed Test?
No — Web Speed Test needs no account, sign-up or installation.
Where is my data processed by Web Speed Test?
Entirely in your browser — Web Speed Test keeps your data on your own machine and sends nothing anywhere.
What file does Web Speed Test read?
Export a Lighthouse or PageSpeed Insights JSON report and load it into Web Speed Test; it surfaces the scores and Core Web Vitals locally.
Does Web Speed Test work offline?
Once the page has loaded, Web Speed Test keeps working with no network connection.