Network information
The page reads what your browser knows about its connection and updates when it changes or when you go offline. A second panel times a few small requests to this site, to give a feel for latency. It does not measure download speed. Connection details come from the Network Information API, which only Chromium browsers support.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Read the status and connection details at the top; they update by themselves when your connection changes.
- Press Run latency test to time five requests to this site.
- Compare median and jitter. Run it again on another network to compare.
How it works
The browser’s navigator.connection supplies the effective type, downlink in Mbps, round-trip time in ms, and Data Saver. The latency test fetches this site’s /favicon.svg five times, one after another, each with a unique query string and no-store caching so every request really goes to the server. Each request is timed with performance.now(). Nothing is sent except those requests to this site.
Worked example
Five requests take 20, 30, 40, 25 and 35 ms. Sorted they are 20, 25, 30, 35, 40, so the median is 30 ms, the average is 150 ÷ 5 = 30 ms, and jitter is the mean of the differences 10, 10, 15 and 10, which is 45 ÷ 4 = 11.25 ms.
Tips
- Run it on mobile data and on Wi-Fi to see the difference.
- A high jitter matters more than a slightly higher median for calls and games.
Frequently asked questions
Why does it say the browser does not expose connection details?
The Network Information API is only available in Chromium-based browsers. Safari and Firefox do not provide it. Online or offline status and the latency test do not depend on it and still work.
What does effective connection type mean?
It is the browser's estimate of how the connection behaves, reported as slow-2g, 2g, 3g or 4g, based on recently measured speed and latency. It describes performance, not the actual technology, so a good Wi-Fi connection usually shows 4g.
Is this a speed test?
No. The downlink figure is an estimate rounded by the browser, and the latency test only times tiny requests. For download and upload speed you need a test that transfers large amounts of data.
Why do I get different latency numbers each time?
Latency varies with Wi-Fi signal, other traffic on your network and the distance to this site's server. The median of five requests is more stable than any one number, and jitter shows how much the numbers vary from one request to the next.