When you’re designing cover photos, graphics, and other social media assets, sometimes knowing the bare bones image dimensions isn’t enough. Here is everything you’ll need to know when creting images for your Tumblr page.
Original Source: https://makeawebsitehub.com/social-media-image-sizes-cheat-sheet/
Tumblr Image Sizes
Profile image: 128 px wide by 128 px tall
Image post: 500 px wide by 750 px tall