Perfect dimensions for headers, posts, and profile images. Optimize your visuals for maximum impact on X.
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Single Image (1200x675) and HD (1600x900) display perfectly in timeline. HD format gives better detail when users expand images.
Square (1080x1080) works great for cross-posting with Instagram. Vertical (1080x1350) maximizes mobile screen space.
Use 400x400 for profile pictures (high contrast works best) and 1500x500 for headers to avoid awkward cropping.
Link previews (1200x628) optimize sharing appearance. Keep important text away from edges for better mobile display.