Taskbar Thumbnail Tuner allows you to modify several settings of taskbar thumbnails in Windows 7 and Windows 8. You can adjust margins, size of thumbnails, fade in delay as well as some other options what inaccessible through default Windows settings.
It is a free and portable application. Taskbar Thumbnail Tuner supports Windows 7 as well as Windows 8 and allows you to do the following:
Adjust thumbnails size
Adjust number of grouped application windows thumbnails
Adjust horizontal spacing between the thumbnails
Adjust vertical spacing between the thumbnails
Adjust thumbnail's caption position
Adjust top margin
Adjust bottom margin
Adjust left margin
Adjust right margin
You can completely disable taskbar's thumbnails.
Click "Apply" button to save your changes. Windows Explorer will be restarted.
Click "Defaults" button to restore all thumbnails settings to their defaults.
There are two versions available – first is for Windows 7 and second is for Windows 8. They are similar but one of them was compiled with .NET 4.5 to match Windows 8.