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Website performance checker

Measure server response, redirects, HTML size, compression, caching and the resources of a page. No made-up Core Web Vitals.

AvailableBrowser and serverInput: URL

How to use: Website performance checker

  1. Enter the public URL (or paste the HTML).
  2. Choose how many resources to check and, if available, PageSpeed Insights.
  3. Review what was measured and download the PDF report.

What it accepts and what you get

Input
A public http(s) URL or pasted HTML.
Output
HTTP response, redirects, time to first byte, size, compression, caching, resources and recommendations.
Where your data is processed
The address you enter is sent to the TodoToolsOnline server, which downloads the public page and the headers of some resources; no results are stored. If the administrator enables PageSpeed Insights and you ask for it, the address is also sent to Google. Pasted HTML is analysed in your browser.

Limitations and notes

  • Times are measured from the TodoToolsOnline server: not the full load time and not a real phone.
  • Core Web Vitals and Lighthouse only appear if the administrator configures PageSpeed Insights; otherwise “Not checked”.

Suggested next steps

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