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To cast from your computer to a TV using Chromecast, you need three things: a Chromecast device plugged into your TV's HDMI port, your computer connected to the same Wi-Fi network as the Chromecast, and either the Chrome browser or a compatible app on your computer. The Chromecast itself is a small dongle that costs between $30 and $100 depending on the model — the basic version works fine for most casting tasks.

Your computer must be on the same Wi-Fi network as your Chromecast for them to communicate. If your computer is on a guest network or a different band (2.4 GHz vs. 5 GHz), casting will not work. Check your network settings before you start. Windows, Mac, and Linux computers can all cast, though the steps differ slightly between them.

Key Takeaways

  • Your computer and Chromecast must be connected to the same Wi-Fi network before you can cast anything.
  • In Chrome browser, click the three-dot menu, select "Cast", choose your Chromecast device, and pick whether to cast a tab or your entire screen.
  • Casting a single tab uses less bandwidth and battery than casting your whole screen, and the tab continues playing even if you switch to another window.
  • If your Chromecast does not appear in the Cast menu, restart both your computer and the Chromecast device, then check that they are on the same network.
  • Some apps like Netflix and YouTube have their own cast buttons built in — you do not need to use the browser cast feature for these.

Casting a Tab from Chrome Browser

Open the Chrome browser and navigate to the website or content you want to cast. Click the three vertical dots in the top-right corner of the Chrome window to open the menu. Scroll down and select "Cast" — you will see a list of available Chromecast devices on your network. Click the device you want to use.

A new window will appear asking whether you want to cast a tab or your entire desktop. Select "Cast tab" for most situations. This sends only the current tab to your TV, which means you can switch to other windows on your computer without affecting what plays on the screen. The audio and video will stream to the TV while your computer remains free to do other work.

To stop casting, click the three dots again, select "Cast", and then click the stop icon next to your device name. The content will disappear from your TV when ready.

Casting Your Entire Screen or Desktop

If you need to show your whole computer screen — for example, to present a slideshow or walk someone through multiple windows — select "Cast desktop" instead of "Cast tab" in the menu. Everything on your monitor will appear on the TV, including your taskbar, notifications, and any windows you open. This is useful for presentations but uses more bandwidth and can drain your laptop battery faster.

When you cast your desktop, your mouse and keyboard still control your computer normally. Anything you type, click, or open will show on the TV in real time. Be aware that sensitive information — passwords, private messages, or personal files — will be visible on the big screen, so close those windows before you start casting.

Using Cast Buttons in Apps and Websites

Many streaming services and websites have their own cast buttons built in. Netflix, YouTube, Disney+, Spotify, and Google Photos all include a cast icon (usually a rectangle with curved lines in the corner) that you can click directly without opening the Chrome menu. Click the cast icon, select your Chromecast device, and the content will stream to your TV.

Using the app's built-in cast button is often smoother than casting through the browser because the app communicates directly with the Chromecast. You can also close the browser window or switch to another app on your computer, and the content will keep playing on your TV. This is the preferred method for streaming video and music.

Troubleshooting When Your Chromecast Does Not Appear

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 your computer's network settings and confirm you are connected to the same network name (SSID) as your Chromecast. If you have both a 2.4 GHz and 5 GHz network with the same name, try connecting your computer to the 2.4 GHz band, which Chromecast devices often prefer.

Restart both your computer and your Chromecast device. Unplug the Chromecast from the TV for 10 seconds, then plug it back in and wait for the light to stabilize. On your computer, close Chrome completely and reopen it. Then try the Cast menu again. If the device still does not appear, restart your Wi-Fi router as well — wait 30 seconds after unplugging it before plugging it back in.

If you see the Cast menu but your device appears offline or grayed out, your Chromecast may have lost its connection to Wi-Fi. Use the Chromecast app on your phone to reconnect it to your network, or factory reset the device by holding the reset button on the back for 15 seconds.

Improving Performance and Reducing Lag

Casting works best when your computer and Chromecast are close to your Wi-Fi router. If you are casting from a room far from the router, move closer or consider using a Wi-Fi extender. Lag — the delay between what you do on your computer and what appears on the TV — is usually caused by a weak Wi-Fi signal or network congestion.

Close unnecessary programs and browser tabs on your computer before casting, especially if you are casting your entire desktop. Each open app uses bandwidth and processing power. If you are casting video, lower the resolution in the video player if you notice stuttering or buffering. Most streaming services let you adjust quality in their settings menu.

If you are casting from a laptop, plug it in rather than running on battery. Casting drains the battery faster, and a plugged-in computer will perform better and maintain a stronger connection to your Wi-Fi.

Casting from Different Operating Systems

Windows, Mac, and Linux computers all cast the same way through Chrome — use the three-dot menu and select Cast. However, Windows 10 and later also have a built-in casting feature called Connect that works with some Chromecast devices. Press the Windows key and the K key together to open the Connect panel, then select your Chromecast. This method does not require Chrome to be open, though it may not work with all Chromecast models.

Mac users can only cast through Chrome or through apps with built-in cast buttons. The Mac operating system does not have a native casting feature for Chromecast. Linux users also cast through Chrome. If you use Firefox, Edge, or Safari, you will need to use the app's built-in cast button if available, or switch to Chrome to use the browser's Cast feature.

Frequently Asked Questions

Can I cast while my computer is locked or asleep?

No. Your computer must be awake and unlocked for casting to work. If you lock your screen or put your computer to sleep, the cast will stop. For long presentations or movie nights, disable sleep mode in your power settings before you start casting.

Does casting use a lot of internet bandwidth?

Casting uses bandwidth, but the amount depends on what you are casting. Casting a single tab with video uses more bandwidth than casting a static webpage. If your internet connection is slow, you may see buffering or lag. Casting works best on networks faster than 5 Mbps, though 10 Mbps or higher is ideal for smooth video.

Can I cast audio only without the video?

Yes, if you are casting music or a podcast through an app like Spotify or Google Podcasts that has a built-in cast button. Click the cast icon and select your Chromecast, and the audio will play on your TV speakers while your computer screen remains dark. This is useful for playing music throughout your home.

What happens if someone else connects to my Chromecast while I am casting?

The new person's content will take over and replace what you were casting. Chromecast devices do not queue multiple users — only one person can cast at a time. If you want to prevent others from casting to your device, you can set a guest mode PIN in the Chromecast app on your phone.

Can I cast from my phone to the same TV at the same time as my computer?

No. Only one device can cast to a Chromecast at a time. If your phone and computer both try to cast, the second one will interrupt the first. You will need to stop casting on one device before starting on the other.