How to use Web Page Size Checker
- Export a Lighthouse or PageSpeed JSON report and open it in Web Page Size Checker.
- Web Page Size Checker reads it locally and surfaces total transfer size, per-type resource weight and gzip/Brotli compression savings.
- Read off the largest resources and compression opportunities; the report never leaves your browser.
About this tool
Web Page Size Checker is a static, client-side tool with no backend. Web Page Size Checker reads a Lighthouse or PageSpeed JSON report in your browser and surfaces total transfer size, per-resource weight and gzip/Brotli compression savings.
Because it reads a report you export, Web Page Size Checker cannot fetch the page itself — browsers block cross-origin requests — so run Lighthouse or PageSpeed, save the JSON, and load it here. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What is Web Page Size Checker for?
Web Page Size Checker runs entirely on your device: add your input, and it checks it locally in real time.
Do I need an account for Web Page Size Checker?
No — Web Page Size Checker needs no account, sign-up or installation.
Is my input private in Web Page Size Checker?
Yes — your input never leaves your device; Web Page Size Checker does all the work in your browser.
How does Web Page Size Checker measure size and compression?
Web Page Size Checker reads the resource-summary, total-byte-weight and uses-text-compression audits from a Lighthouse or PageSpeed JSON report you paste, then shows transfer sizes and gzip/Brotli savings — all parsed locally.
Does Web Page Size Checker work on mobile?
Yes — Web Page Size Checker is just a web page and runs on any modern browser, including phones and tablets.