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Your next improvement

How does your website measure up?

Turn a Google Lighthouse mobile report into a clear A–F website grade and a few practical next steps.

Automatic scanning is temporarily unavailable. Enter your public website to open Google’s PageSpeed Insights, then download its mobile Lighthouse JSON report and import it below. We do not invent scores when a scan is unavailable.

Import a mobile Lighthouse JSON report

In PageSpeed Insights, select Mobile and use its report download option to save JSON. You can also export a mobile report from Chrome DevTools → Lighthouse. Choose that JSON file here; screenshots, PDFs and desktop reports cannot be graded.

Imported reports are user-supplied and can be modified; they are not independently authenticated. Your file is processed in this browser, not uploaded to Highmark Labs.

A transparent grade. Not a ranking promise.

Highmark’s grade uses the rounded, equally weighted average of four mobile Lighthouse category scores: Performance, Accessibility, Best Practices and SEO. A: 90–100 · B: 80–89 · C: 70–79 · D: 60–69 · F: below 60. All four scores are required. This is our summary rubric, not a Google-issued letter grade.

Lighthouse checks one page under test conditions. Scores vary between runs. Its technical SEO checks are not your Google search position, traffic or a complete SEO audit. Lab results do not establish a field Core Web Vitals pass or accessibility compliance. Search visibility also depends on useful content, relevance and other factors; improvements do not guarantee rankings, leads or sales.

Preparing a link or importing a report does not send your website address to Google. Opening the Google link sends it to Google under its policies. Only use public URLs you are authorized to test, without login tokens, query strings or private information. No account or email address required; this calculator stores no report in cookies, browser storage or a Highmark database. Hosting providers may process ordinary access logs.

About Google’s measurements · Core Web Vitals and Google Search