Tumblr Profile Picture Size:
Tumblr allows you to put up your Tumblr Profile Picture with dimensions: 128×128 pixels. A great square picture would best represent you or your business; this picture appears on the profile page and next to the button to “follow” you.
Tumblr Image Post Size:
Tumblr lets you post images with a maximum of 10MB file size, however there is an exception for animated gifs which should not exceed 1 MB. Its dimensions are 570×570 pixels.
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