Drag images to change order
Style
Resize
 Resize to the largest image
 Resize to the smallest image
Grid Options
Rows      Columns 
Margin
 Margin between images px
Margin you see in the preview is proportional to the thumbnails. Actual margins will be bigger.
Fill Color
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Right click on the photo and select "Save Image as" to save
or


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Also see uMarkOnline.com, My Photo Sign