Connect the Chromecast device to your TV and power it on

Plug the Chromecast into an available HDMI port on the back or side of your TV. If your TV has limited HDMI ports and you need the space, you can use an HDMI extension cable. Then plug the USB power cable into the Chromecast — the other end goes into a USB power adapter, which you plug into a wall outlet or a powered USB port on your TV (if your TV has one).

Turn on your TV and switch to the HDMI input where you plugged in the Chromecast. You should see the Chromecast setup screen appear — it will show a code and ask you to visit a website on your phone or computer to finish setup. The device will also emit a sound to confirm it is ready.

If you see nothing on the screen, check that the HDMI cable is fully inserted and that you have selected the correct input. Some TVs require you to press the Input or Source button on the remote and choose the HDMI port number manually.

Key Takeaways

  • Chromecast plugs into an HDMI port and requires a separate USB power source, which comes in the box.
  • The setup screen displays a code that you enter on your phone or computer to connect the device to your Wi-Fi network.
  • You must be on the same Wi-Fi network as the Chromecast for your phone or computer to send video and audio to it.
  • Once set up, you can cast content from apps like YouTube, Netflix, and Google Photos by tapping the cast icon in the app.

Use your phone or computer to complete the setup

On your phone or computer, open a web browser and go to the URL shown on your TV screen, or read the Google Home app from the App Store (iPhone) or Google Play (Android). The app will detect your Chromecast and walk you through the next steps.

The app will ask you to select your Wi-Fi network and enter the password. Make sure you choose the same network your phone or computer is using — Chromecast must be on the same Wi-Fi as your casting device. If you have a 5 GHz and 2.4 GHz network with the same name, Chromecast works better on 2.4 GHz, so select that one if you see it listed separately.

After you enter the Wi-Fi password, the app will connect to the Chromecast and may ask you to sign in with your Google account. This step is optional but recommended — it lets you use features like Chromecast Guest Mode and syncs your preferences across devices.

Name your Chromecast and choose a room

The app will ask you to give your Chromecast a name so you can identify it when you cast from your phone. You can call it "Living Room TV" or "Bedroom" — whatever makes sense for where it is located. This name appears in the cast menu whenever you try to send video or audio to a device.

If you have multiple Chromecasts in your home, naming them by room prevents you from accidentally casting to the wrong TV. You can change the name later in the Google Home app by tapping the device, selecting Settings, and choosing Device Name.

Test casting from an app

Open any app that supports Chromecast — YouTube, Netflix, Spotify, and Google Photos are common ones. Look for the cast icon, which looks like a rectangle with curved lines in the bottom left corner. Tap it and select your Chromecast from the list.

If the cast icon does not appear, the app may not support Chromecast, or your phone may not be on the same Wi-Fi network. Check that your phone is connected to the same network you selected during setup. If you are still having trouble, restart both your phone and the Chromecast by unplugging it for 10 seconds and plugging it back in.

Troubleshoot if your Chromecast is not appearing

If your phone cannot find the Chromecast during setup, check that both devices are on the same Wi-Fi network. Some networks, especially in apartments or offices, block devices from communicating with each other — if that is the case, you may need to ask your network administrator to allow Chromecast traffic or switch to a guest network that permits it.

If the Chromecast was working before but has stopped responding, unplug it from power for 10 seconds, then plug it back in. Wait about two minutes for it to restart and reconnect to Wi-Fi. If it still does not appear, open the Google Home app, tap the Chromecast device, go to Settings, and select Reboot Device.

If you see an error message on the setup screen, write down the error code and search for it on Google's Chromecast support page. Error codes usually point to Wi-Fi problems, power issues, or HDMI compatibility — the support page lists the exact steps for each one.

Adjust settings after setup is complete

Once your Chromecast is working, you can customize it in the Google Home app. Tap the device, select Settings, and you will find options to change the device name, adjust volume limits, enable or disable Guest Mode (which lets visitors cast without signing in), and set a screensaver.

Guest Mode is useful if you have friends or family over — they can cast from their phones without needing your Wi-Fi password or Google account. When Guest Mode is on, a four-digit code appears on your TV, and visitors enter it in the cast menu to connect.

Frequently Asked Questions

Do I need a Google account to use Chromecast?

No. You can set up and cast to Chromecast without a Google account, though signing in gives you access to features like Guest Mode and synced preferences. If you skip signing in during setup, you can add an account later in the Google Home app.

Can I use Chromecast on a 4K TV?

Yes, but standard Chromecast sends video at 1080p resolution. If you want 4K video, you need Chromecast with Google TV, which is a separate device that supports 4K and HDR. Check which model you have before you buy if 4K is important to you.

What if my TV does not have an HDMI port?

Older TVs with only composite (red, white, yellow) cables cannot use Chromecast directly. You would need an HDMI-to-composite converter, though picture quality may suffer. A newer TV or a separate streaming device may be a better option.

Can I cast from my computer to Chromecast?

Yes. On a Windows or Mac computer, open Chrome, click the three-dot menu, select Cast, and choose your Chromecast. You can cast a single tab or your entire screen. Some apps like Netflix and YouTube also have a cast button you can click directly.

Why does my Chromecast keep disconnecting from Wi-Fi?

Chromecast may disconnect if your Wi-Fi signal is weak, your router is far away, or there is interference from other devices. Try moving the Chromecast closer to your router, or restart your router by unplugging it for 30 seconds. If the problem continues, your Wi-Fi network may be unstable — contact your internet provider.