On your pixel open the google home app. Ensure that the chromecast and google pixel are connected on the same wi fi network.

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Connect pixel 3 to tv hdmi. The pixel and pixel xl dont support the popular miracast standard out of the box. Connect google pixel to tv. Make sure that your phone and chromecast are connected to the same wi fi network. Your pixel smartphones screen is cast to your tv. Another way to connect google pixel 3 and pixel 3 xl to tv is by using miracast bear in mind this only works for rooted pixel devices. Add miracast support with this one weird trick.
You should only be able to insert the hdmi plug into the port in one direction. On your pixel smartphone go to access settings and select screen mirroring. Purchase a chromecast adapter if your smart tv does not support chromecast connect the adapter to an available hdmi port on your tv. Connect one end of the cable to the device. If you do not have a smart tv that supports chromecast you can acquire a google chromecast and connect it to the hdmi port on your tv. Its a shame and hopefully google will add this functionality in future devices.
Download and install chromecast. Turn on the device you want to connect to the tv and then gently insert the matching end of the cable into its hdmi port. Ensure the chromecast and pixel are connected to the same wi fi network. Chromecast now connects to the pixel 3 without the need to connect to the same wifi like if youre watching a movie in a hotel and dont want to have with setting up chromecast or even without wifi like if you want to watch a movie in the woods on a pico projector the first time you set it up you need another phone but its. Install the google home app on the pixel. That means they wont work with usb c to hdmi adapters of any kind.
In the upper left corner of the screen tap the menu button then go to cast screenaudio. Find your chromecast and tap on it to connect. Connect to chromcast to a power source via the usb plug. Never force the cable plug into the port since doing so could damage both the cord and the device.