The Basic Steps to Cast from Your Computer

To cast your computer screen to your TV using Chromecast, you need three things: a Chromecast device plugged into your TV's HDMI port, your computer and TV on the same Wi-Fi network, and the Chrome browser open on your computer. The actual casting takes about 30 seconds once everything is connected.

Open Chrome on your computer and click the three vertical dots in the top right corner. Select "Cast" from the menu. A small window will appear showing available Chromecast devices on your network. Click the device name you want to use. Your computer screen will then appear on your TV.

The first time you cast, your TV may ask you to confirm the connection. You'll see a code on both screens that should match — this is normal security. Once confirmed, future casting to that device will happen without this step.

Key Takeaways

  • Your computer and Chromecast device must be connected to the same Wi-Fi network, or casting will not appear as an option.
  • You can cast your entire screen or just a single Chrome tab, depending on what you want the TV to show.
  • Casting uses your Wi-Fi connection, not a cable, so your computer can be anywhere in the room and still work.
  • If your Chromecast does not appear in the Cast menu, restart both your computer and the Chromecast device by unplugging it for 10 seconds.

Casting Your Entire Screen vs. a Single Tab

Chrome gives you two casting options, and choosing the right one depends on what you want to show. Cast entire screen sends everything on your monitor to the TV — your desktop, all open windows, and anything you click. This is useful for presentations, showing photos from your files, or playing videos stored on your computer.

Cast tab sends only the Chrome tab you select to the TV, leaving everything else on your computer private. Use this when you want to show a website, YouTube video, or Google Doc while keeping other tabs and windows hidden. The tab option also uses less internet bandwidth.

To choose which option you want, click the three dots in Chrome, hover over "Cast," and you'll see both choices listed. Select the one that fits what you're doing. You can switch between casting your screen and casting a tab at any time without disconnecting.

Fixing Connection Problems

If your Chromecast device does not show up in the Cast menu, the most common cause is that your computer and Chromecast are not on the same Wi-Fi network. Check that both are connected to the same network name (SSID). Some homes have separate 2.4 GHz and 5 GHz networks — Chromecast devices often work better on 2.4 GHz, so try connecting your computer to that band if you have the option.

If they are on the same network and the device still does not appear, restart your Chromecast by unplugging it from the TV for 10 seconds, then plugging it back in. Wait about 30 seconds for it to fully boot up. While you wait, also restart Chrome on your computer by closing and reopening the browser.

If the device appears but casting fails after you click it, check that your TV is set to the correct HDMI input. Your TV remote should have an "Input" or "Source" button that lets you switch to the HDMI port where your Chromecast is plugged in. Once you select the right input, try casting again.

What to Do When Your Screen Lags or Freezes

Lag — a delay between what you do on your computer and what appears on the TV — usually means your Wi-Fi signal is weak or your network is busy. Move your computer closer to your router, or ask others on your network to pause large downloads or streaming. Casting uses bandwidth, so the more devices streaming at once, the slower your cast will be.

If your screen freezes or the picture cuts out, first try closing other programs on your computer to free up processing power. Then disconnect and reconnect the cast by clicking the Cast icon again and selecting your device. If freezing happens often, your Wi-Fi may not be strong enough — consider moving your router closer to where you cast, or upgrading to a mesh Wi-Fi system that covers more area.

For video playback specifically, lower the video quality in the player (usually a settings gear icon) before casting. High-definition video uses more bandwidth and is more likely to stall on a weaker connection.

Controlling Playback and Volume from Your Computer

Once you are casting, your computer becomes a remote control for what plays on the TV. If you are casting a YouTube video or other media, you can pause, play, skip forward, and skip backward using the player controls on your computer screen — the TV will respond when ready. Volume control depends on what you are casting.

When casting a tab with video or audio, the volume buttons on your TV remote control the TV's speakers. When casting your entire screen, you can also control volume from your computer's volume keys or settings. If you want to stop casting without turning off the TV, click the Cast icon in Chrome and select "Stop casting."

Casting from Different Browsers and Devices

Chromecast works natively in Chrome, but you may be able to cast from other browsers on your computer. Microsoft Edge has a built-in Cast feature that works the same way as Chrome — click the three dots, select "Cast media to device," and choose your Chromecast. Firefox does not have native casting, but you can still cast by opening a Chrome window alongside Firefox.

If you want to cast from a different device entirely, Chromecast also works with Android phones and tablets, iPhones and iPads (through AirPlay if your TV supports it), and some Windows tablets. Each device has its own casting method, but the principle is the same: both devices must be on the same Wi-Fi network.

Frequently Asked Questions

Do I need to be connected to the internet to cast?

Yes, both your computer and Chromecast need to be on the same Wi-Fi network. If your internet goes down, casting will stop working. However, you do not need a strong internet connection for casting itself — a weak connection will just cause lag or freezing.

Can I cast while my computer is locked or asleep?

No. Your computer must be awake and unlocked for casting to work. If your screen goes to sleep, the cast will pause. You can adjust your computer's sleep settings to stay awake longer while you are casting — search "power settings" in your computer's control panel.

What if my TV does not have an HDMI port?

Older TVs without HDMI cannot use Chromecast directly. However, some people use HDMI-to-composite adapters, though these are unreliable. A better option is to use a different streaming device that matches your TV's inputs, or to consider upgrading your TV.

Can multiple people cast to the same TV at the same time?

No. Only one device can cast to a Chromecast at a time. If someone else tries to cast while you are already casting, they will see a prompt asking if they want to take over. You can choose to allow it or keep your cast active.

Why does my cast keep disconnecting?

Disconnections usually happen because your computer or Chromecast lost Wi-Fi connection, or because your computer went to sleep. Check your Wi-Fi signal strength, move closer to your router, and disable sleep mode on your computer while casting. If disconnections persist, restart both devices.