Environment snapshot

Collects navigator, screen, viewport, localStorage/sessionStorage/indexedDB, quota via navigator.storage.estimate(), cookies, optional iframe probes (same-origin only), and performance hints. Unsupported APIs are omitted or labeled; DOM summary stays lightweight by default.

Include storage values (truncated) Request User-Agent Client Hints (Chromium) Probe URLs via hidden iframes (same-origin only; see below)

Optional: URLs to probe (one per line)

Privacy: Cookies, localStorage, sessionStorage, and indexedDB are only readable when the frame is same origin as this tool. Other sites stay opaque to this page by design. For the same origin, localStorage is shared across paths; sessionStorage is per browsing context (often differs per iframe). indexedDB lists database names/versions only (no object-store dump). Cross-origin frames show as blocked; many sites block iframes (X-Frame-Options / CSP). Up to 8 URLs per run.

Click “Collect data” to run.

Quota estimate() reflects browser storage for this origin (not “how much Chrome ate globally”). Storage, cookies, and iframe results may be sensitive. User-Agent Client Hints need a secure context in some browsers.