How to use Web Speed Test Free
- Give Web Speed Test Free a Lighthouse JSON report (or paste it) to work from.
- Click Read report — Web Speed Test Free processes everything on your device.
- Read the category scores and Core Web Vitals that Web Speed Test Free lays out for you.
About this tool
Web Speed Test Free runs entirely in your browser. Export a report from Chrome DevTools or PageSpeed Insights and load the JSON into Web Speed Test Free to see the scores locally.
Because Web Speed Test Free 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 Web Speed Test Free?
Web Speed Test Free runs entirely on your device: add your input, and it checks it locally in real time.
Is Web Speed Test Free free to use?
Yes — Web Speed Test Free is completely free, with no usage limits.
Is my input private in Web Speed Test Free?
Yes — your input never leaves your device; Web Speed Test Free does all the work in your browser.
What file does Web Speed Test Free read?
Export a Lighthouse or PageSpeed Insights JSON report and load it into Web Speed Test Free; it surfaces the scores and Core Web Vitals locally.
Can I use Web Speed Test Free without a connection?
Yes — after the first load Web Speed Test Free runs entirely offline.