How to use Website Speed Test Online
- Give Website Speed Test Online a Lighthouse JSON report (or paste it) to work from.
- Hit Read report and Website Speed Test Online computes the result client-side.
- Read the category scores and Core Web Vitals that Website Speed Test Online lays out for you.
About this tool
Website Speed Test Online is a static, client-side tool with no backend. Website Speed Test Online reads a Lighthouse or PageSpeed Insights JSON report in your browser and surfaces the headline numbers without a server.
Because Website Speed Test Online 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 Website Speed Test Online for?
Website Speed Test Online runs entirely on your device: add your input, and it checks it locally in real time.
Do I need an account for Website Speed Test Online?
No — Website Speed Test Online needs no account, sign-up or installation.
Does Website Speed Test Online upload my data?
No — Website Speed Test Online processes everything locally in your browser, so nothing you enter is uploaded or stored.
What file does Website Speed Test Online read?
Export a Lighthouse or PageSpeed Insights JSON report and load it into Website Speed Test Online; it surfaces the scores and Core Web Vitals locally.
Can I use Website Speed Test Online without a connection?
Yes — after the first load Website Speed Test Online runs entirely offline.