What is the Size of the Space Banner and Thumbnail?
1440 × 100 pixels for the header image, and 340 × 140 pixels for the thumbnail.
Updated on 6 October 2026
The settings of the space give the recommended sizes:
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Header image (the banner at the top of the space): 1440 × 100 pixels.
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Thumbnail (shown in the overview of the spaces): 340 × 140 pixels.
You can also choose a colour instead of an image.
To learn where to change them, read How do I change the look of my groups and spaces?