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The available values for thumbnail size in Preferences (on the Appearance tab) are 120px, 150px, 180px, 200px, 220px (default), 250px, 300px, and 400px. As explained at Wikipedia:Extended image syntax § Size, upright=Factor will "adjust a thumbnail's size to Factor times the default thumbnail size, rounding the result to the nearest multiple of 10".
A file in thumbnail mode uses the codes thumb or thumbnail. This will display a thumbnail with a caption. The default size is 220 pixels wide unless the full size file is smaller. Registered users can specify their own default size if they wish. In normal circumstances, images are scaled down automatically by Wikipedia's server.
thumb (or thumbnail) Automatically scale the image, and put a box around it. Show a caption if specified. Float the image on the right unless overridden with the location attribute. With an operand, e.g. thumb=Example.png, the operand names an image that is used as the thumbnail, ignoring any size specification. frame
Articles carry reduced-size thumbnails instead of full images (which the user can view by "clicking through" the thumbnail) but in some file types a thumbnail's reduced dimensions doesn't translate into a concomitant reduction in file size. (In most browsers you can see a thumbnail's size by right-clicking for its "Properties".)
The frameless option causes a plain picture to default to the same size as a thumbnail. As with thumbnails , the default can be adjusted with the upright= factor option. If you use the common default of 220 pixels for thumbnail widths, the following example image's width will be 220 × 0.2 pixels, which rounds to 40 pixels:
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Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate
Avoid using or creating images with fonts that are too small to be legible in thumbnail or smartphone views. The font size that appears in a thumbnail is a combination of svg width, thumbnail width, and font size. To match wikipedia font size as a thumbnail, use font-size = (63/(your upright value))*((your svg width)/1000).