Its a big puzzle to know the internet speed every time. If the website opens by one click or video's, photos download in seconds it means that internet is fine. If video is buffering we may think internet is slow. So all these are just our assumptions. Is there any way we can find out what's the speed of internet used by PC, mobile? Yes Just open browser and type https://fast.com you will get your network details in seconds. Not only the speed related information you can also get customer details like Server Location, Latency in loaded and unloaded. Useful site to know the network speed information.