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:

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Taskband

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.

Additional Information

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:

  1. NumThumbnails
  2. MinThumbSizePx
  3. MaxThumbSizePx
  4. TextHeightPx
  5. TopMarginPx
  6. LeftMarginPx
  7. RightMarginPx
  8. BottomMarginPx
  9. ThumbSpacingXPx
  10. ThumbSpacingYPx

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.

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  1. said this on Monday, July 14th 2014 6:17 pm

    […] 7 Taskbar Thumbnail Customizer has been inspired by the blog post at Winhelpline.com, run by my MVP colleague Ramesh Srinivasan, and the credit for the tweaks used in this app goes to […]

  2. said this on Sunday, April 27th 2014 12:38 pm

    […] Taskbar Thumbnail Tweaker v 1.1 , has been developed for The Windows Club by Ritesh Kawadkar. Thanks & credits are also due to Winhelponline.com. […]

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