No internet

WiFi connected but no internet

Read the complete step before making changes. Stop if unsure or if new warnings appear.

Other devices have internet?
Open the same website on a phone on the same WiFi. Switch off mobile data briefly so that the test actually runs over WLAN. Also test a second website. If all devices have the problem, it is more likely the router or provider.
WLAN on the PC off and on again
Click on the network icon at the bottom right. Turn off Wi-Fi, wait ten seconds and turn it back on. Choose your known network; have the WiFi password ready.
Restart router (10 seconds from power)
Only on your own router and not during an update: Inform other users, as the Internet and Internet telephony will be interrupted briefly. Unplug the power plug for about ten seconds and plug it back in. Wait a few minutes. DO NOT press the reset button; it can delete settings.
Deactivate VPN/Proxy as a test
For a private VPN, click “Disconnect” in its app. You can find the proxy under Settings → Network and Internet → Proxy. Note existing settings before making a change and restore them after testing. Do not change company VPN or required settings.
Use Windows Network Troubleshooter
Windows 11: Settings → System → Troubleshoot → Other troubleshooters → Network and Internet. Windows 10: Update and Security → Troubleshoot → Additional troubleshooters → Internet Connections. Follow the questions; it can launch “Request Help”.
Flush DNS cache: ipconfig /flushdns
Search for “cmd” in the Start menu and open Command Prompt as administrator. Type ipconfig /flushdns and press Enter. After confirmation, reopen the browser and test the page. This command does not delete personal files.