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Avatars Maximum pixel dimensions: 170 pixels wide by 240 pixels high.
Maximum file size: Remains 75k
Pixel Space: 180 pixels wide and 400-480 pixels tall
Maximum Pixel Dimensions: 200 pixels wide by 700 pixels tall.
Maximum File Size: 100k if you're using a clear-GIF as your avatar, if not, the combined file size of your avatar and background image cannot exceed 150k.
No larger than 600 pixels wide by 70 pixels tall.
Maximum file size of 50kb.