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The following are techniques to auto-size, or scale, any image ("thumb" or "frameless"), based on each user's default thumbnail size (220px for those not logged in or for those who have not changed it at Special:Preferences). Within an image link, the options are as follows:
thumb– displays the image as a framed thumbnail at the user's default sizeframeless– displays the image as an unframed at the user's default sizeupright– scales the image to approximately 75% of the user's default size (25% smaller)upright=0.8– scales the image to approximately 80% of the user's default size (20% smaller)upright=1.2– scales the image to approximately 120% of the user's default size (20% larger)left– shifts the image to the left marginright– shifts the image to the right margincenter– shifts the image to center between left/right margins
Each of the above sizing options can be used in any image link coded into a Wikipedia page, in the form [[File:Example.jpg|thumb|upright|left|Description]]. When a user views the page, the image will be resized based on the user's default image size setting.