Google Chrome allows you to merge a single tab from another window, but what if both windows have multiple tabs which too exhausting if we had to move them one by one?
Luckily, you can merge two or more Chrome windows with multiple tabs each without having to move every tab manually. So, how to do that?
Make sure you are using the modern versions of Google Chrome to get the features mentioned in the following guides. If not, please update Chrome first!
#1 Merge Chrome windows without extensions
1. Go to the Chrome window you want to merge.

2. Click on the first tab (the most left).

3. Hold Shift and then click on the last tab (the most right). This action will select all the available tabs.

4. Release the Shift button, and then using the pointer, click and drag the last tab into another Chrome window.

5. You would see all tabs are now in one window.

This method essentially exactly the same when you moving a single tab, but you have to select all the tabs first before moving. It also works if you have multiple monitors system.
#2 Merge multiple Chrome windows with extensions
There are plenty of Chrome extensions offering an instant merge feature in just one click away. The one that I highly recommended is Join Windows. It’s simple yet has quite of options you can modify.

If this extension no longer available or somehow doesn’t work with your Chrome, please refer to the alternatives:
That’s it! I hope this guide helps you.
Check out my previous guide about Restoring Recently Closed Tabs in Google Chrome really fast! That way you don’t need to bother with Chrome History.
WOW!! I really did not know about this–you just saved me so much time!!! Awesome!! =D
You have to drag the FIRST tab, not the last one.