Does this prove Google has indexed the page?
No. It checks page-level signals in the fetched HTML and response headers. Indexing still depends on crawl discovery, page quality, rendering, canonical selection, and Search Console state.
Why does the checker block private or localhost URLs?
A public page checker must not fetch internal network targets. Blocking local, private, reserved, credentialed, and non-http destinations reduces SSRF and proxy-abuse risk.
Does it run JavaScript before checking tags?
No. It reads the returned HTML and response headers. Use a browser-based crawl or Search Console URL inspection when indexing signals are injected client-side.
Do utility tools upload my payload?
Use the page notes for each tool. Browser-side utilities can generate outputs locally, but the final file or code may still reveal whatever you encode or share.
Why should I test the generated output?
Scanners, printers, file viewers, apps, and platform previews can behave differently, so test the exact downloaded output before using it publicly.
Why might another checker show a different output?
Different tools may use different rounding, assumptions, default rates, methods, formulas, or input timing. Compare the visible method and inputs before relying on the output.