How To Extend Your Windows Desktop With The Chromecast [Guide]


The Chromecast is considered a device meant for entertainment purposes. Most apps that are developed for it tend to be geared for entertainment but it has actual productive uses, for example, you can use it to give presentations from your phone. Another great use you can put your TV and Chromecast to is as an extended display for your system. You can do this with Windows 7, 8, and 10. Here’s how.

This guide assumes the following things;

  1. You have a Chromecast connected to your TV and it is properly set up
  2. You have the Chrome browser installed on your PC and the Google Cast extension installed on it
  3. Your copy of Windows is genuine

Step 1: Adding a second screen

To get started, open the display settings on Windows. On Windows 10, go to the Settings App and click the System group of settings. Here, go to the Display tab.

On Windows 7 & 8, right-click on the desktop and select Screen resolution from the context menu.


Click Detect and it will tell you that no other display has been detected. This is normal and that’s exactly how it should work. Once it tells you no other display has been detected, it will add a second ‘undetected’ display next to the default one that it has detected.


Click this second display so that it’s selected and then scroll down to where it says ‘Multiple Displays’. From the drop-down menu, select the ‘Try to connect anyway on: VGA’ option. This will effectively add a second monitor to your system. Click ‘Apply’.


Step 2: Extend the display

Once you have two displays set up, look for the ‘Multiple Displays’ option in the Display tab and open the drop-down. Select the ‘Extend these displays’ option. You can drag & drop the displays to reorder them on this screen.


Step 3: Cast your second display to Chromecast

Open Chrome and click the Google Cast extension. Click the little arrow button and select ‘Cast screen/window (experimental)’ from the drop-down menu.


You will be asked to select which screen it is you want to cast to the Chromecast. Select the second one you added to Windows.


Step 4: You now have a second screen

There is obviously lag between the two but you can still use it to display a window that you want to keep on top of all others, monitor a feed, and more.

Via Andrew Cote

  • dawgfish18

    This is useful, except that when I try to detect another monitor (on Windows 10), it says “Didn’t detect another display,” but it does not give me the 2nd monitor box you show in step 1. Any ideas why that wouldn’t appear? Do I need to toggle a setting somewhere for that to appear?

    • Andrew Roberts

      I have this same issue – unresolved. Did you work it out?

      • dawgfish18

        Not as of yet. :-/

        • Nic

          Have exactly the same problem and haven’t found a solution either…

    • aalier

      Go to Control Panel and click on “Adjust screen resolution” under the “Appearance and Personalization” heading and then do the detection.

      • masstq

        Unfortunately it doesn’t work…

  • “My copy of windows is genuine”?

  • yocarlos

    thak you

  • Robert England

    If you don’t show a screen grab for every step, why bother? Windows would never add a second ‘make believe’ monitor after pushing ‘detect’ where do you get this stuff? It didn’t do anything you said…

    • You Like That, Don’t You

      Except for those of us it did work for.

  • You Like That, Don’t You