What are the differences between HTML5 and (pre-5) HTML? How can I make HTML-like forms in Markdown? What is difference between Hypertext and Markup in HTML?
You set the inches and the number of pixels in each of those inches. Photoshop removes or adds data to fit the number of pixels in each of the inches you specified. Note: The original image used in the examples below is 4x4 inches, 100 ppi, 400x400 pixels at 468.8 KB.
Note: This post will be updated on an ongoing basis with all the latest information for ideal image sizes in social media posts. Feel free to check back in for the best, most current recommendations! Latest update 8/15/15: Instagram display size now at 1,080 pixels by 1,080 pixels.