Fetch & Render Simulator
Tool designed to simulate the googlebot fetch & render. Will return rendered, and initial
source code (obeys the user-agent specified) and a screenshot.
Optionally you can also run a lighthouse test as well. Although intended to match, parity with the Google WRS cannot be guaranteed, always confirm in either the Rich Results Test or URL Inspection tool in Search Console.
Honour robots.txt uses the google open source parser, robots.txt files are fetched fresh for each test.
Test results deleted after 5 mins max, tests are not logged.
URL is required
Lighthouse tests will be mobile for mobile user-agents, desktop for desktop
Flattening the DOM will pierce the Shadow DOM, and also render content of iframes EXPERIMENTAL
Overlay / Output Core Web Vitals will show LCP element, any LCP Shift & FID (basically runs this bookmarklet you can run in you browser).
User Agent / Referrer
Uses these excellent open source projects:
for robots.txt parsing and matching &
for DOM flattening.
iframe flattening inspired by a discussion with Glenn Gabe ( @glenngabe ), of G-Squared Interactive