What Is Tumblr GIF Size Limit
Tumblr GIF Size limit is currently 1MB, before year 2012, it used to be 500KBs.
Bear in mind, that not only the GIF File needs to be less than 1MB in size in order to display correctly, but also has to be no bigger than 500 pixels in dimension
Otherwise, the picture will get published, but won’t be animated.
