Until last week I was thinking that increasing the taskbar thumbnail window size is not possible natively in Windows 7 (and Windows Vista). Well! Windows 7 supports the ability to increase the thumbnail preview size natively, through registry edits which I’m covering in this article.
This is how the taskbar thumbnail preview window appeared prior to applying the following edit.
Make the Taskbar Thumbnail Preview Bigger in Windows 7
1. Launch Regedit.exe and navigate to the following location:
2. Create a DWORD value named MinThumbSizePx
3. Double-click MinThumbSizePx and set its value data accordingly. I set it to 350 (Decimal) for this example.
4. Exit the Registry Editor.
5. Logoff and login back.
And you can see below that the taskbar thumbnails has grown bigger in size.
Similarly, you can tweak the following registry values under the "Taskband" registry branch, and customize the taskbar thumbnail previews as you need. Here is the entire list:
Editor’s Note: Hoping to write an program to customize Windows 7 Taskbar Thumbnails based on the above registry edit. In Windows Vista, the feature was made available by a nice little program called Vista Thumbnail Sizer by Andreas Verhoeven, which was announced by the How-To Geek Website.