Network Information

Network Information shows what your browser itself knows about your connection, without testing it. At the top it says whether the browser considers itself online or offline, and updates the moment that changes. In browsers that share more — Chrome, Edge, Opera and Samsung Internet — it adds the browser’s estimate of the connection’s quality (from “very slow, like 2G” to “fast, 4G or better”), a rough download speed and round-trip time, the kind of link on Android and ChromeOS (Wi-Fi, mobile data, Ethernet), and whether Data Saver is on. Sites use these same figures to decide whether to send smaller pictures or skip autoplaying video. While the page is open it keeps a list of every change, so you can watch what happens when Wi-Fi drops, you switch to mobile data, or you walk out of range.

1. Open the page: the current state appears straight away.
2. Leave it open and switch Wi-Fi or mobile data off and on; each change is listed with the time.
3. Read the connection details below, if your browser gives them.

• This is not a speed test. Browsers round these figures and Chrome stops at 10 Mbit/s, on purpose, so that sites cannot use them to identify you. A speed test needs a server to download from, which this site does not run (doc 04: it would need a backend).
• Online means the device is connected to a network, not that the internet works: on a Wi-Fi network with no internet, or behind a sign-in page at a hotel or airport, the browser still says Online.
• Firefox and Safari share only online or offline; the other details say Not reported there.
• The connection type is reported only on Android and ChromeOS. On Windows and Mac, Chrome leaves it out.
• The quality estimate comes from the browser’s recent downloads, so it settles a few seconds after a change and may lag behind reality.
• Nothing is measured over the network and nothing is sent: the page only reads what the browser already knows and shows it to you. The change list lives on the page and is gone when you leave.

No. It shows the browser’s own rounded estimate, capped at 10 Mbit/s. To measure speed, use a speed-test service, which downloads from its own servers.

Online only means the device is connected to a network. The router may have lost its internet connection, or the network may want you to sign in first. Try opening any website to see a sign-in page.

A setting in some browsers and phones that asks sites to send less data — smaller images, no autoplay. If it is on here, sites that respect it will look simpler.

Only Chromium-based browsers share them. Firefox and Safari decided the extra details were not worth the privacy cost.