How to use Core Web Vitals Checker
- Give Core Web Vitals Checker a Lighthouse JSON report (or paste it) to work from.
- Press Read report to run it locally in your browser.
- Use the category scores and Core Web Vitals Core Web Vitals Checker produces — nothing was uploaded.
About this tool
Core Web Vitals Checker runs entirely in your browser. Export a report from Chrome DevTools or PageSpeed Insights and load the JSON into Core Web Vitals Checker to see the scores locally.
Because Core Web Vitals Checker 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 Core Web Vitals Checker?
Core Web Vitals Checker lets you check your input right in the browser, with the result shown instantly and nothing uploaded.
Do I need an account for Core Web Vitals Checker?
No — Core Web Vitals Checker needs no account, sign-up or installation.
Does Core Web Vitals Checker upload my data?
No — Core Web Vitals Checker processes everything locally in your browser, so nothing you enter is uploaded or stored.
What file does Core Web Vitals Checker read?
Export a Lighthouse or PageSpeed Insights JSON report and load it into Core Web Vitals Checker; it surfaces the scores and Core Web Vitals locally.
Does Core Web Vitals Checker work on mobile?
Yes — Core Web Vitals Checker is just a web page and runs on any modern browser, including phones and tablets.