Tool

Home Wi-Fi Diagnostic

Describe the symptom, when it happens, and how your router is set up. You get ranked causes and a test order so you change one thing at a time.

Describe the problem

This is a guided decision tree, not a signal meter. It cannot see your network — it ranks likely causes from your answers and gives you an order to test them in.

Which best describes what you see?

Slow on every device, everywhere in the homeFine near the router, poor in one room or floorConnection drops or reconnects repeatedlyOnly one device has the problemVideo calls or streams stutter while browsing seems fine

Have you tested with an Ethernet cable?

This single check decides whether the problem is Wi-Fi at all.

Wired (Ethernet) test was fastWired (Ethernet) test was also slowI have not tested with a cable

When does it happen?

Where does the router sit?

Router age (years)A rough figure is fine

Devices on the networkInclude phones, TVs, and smart-home gear

What this tool does and does not do

It does not measure anything. There is no signal meter, no speed test, and no access to your network — it ranks causes from the answers you give.
Rankings are editorial judgements about which explanations usually fit which symptoms. A low-ranked cause is not ruled out.
Record your router settings before changing them. An incorrect change can lock you out of the admin page, and some routers need a factory reset to recover.
Nothing you enter leaves your browser. No account, no storage, no data collection.