Apr 8, 2015
Tumblr Inline Image Width Limits: Inserting an inline image into the caption of your post? If your image is fewer than 300 pixels wide, Tumblr shows your image at its exact width on the Dashboard. But if it's 300 pixels or more wide, Tumblr resizes the image to span the full 540-pixel width on the Dashboard. That means a 300-pixel-wide image would bloat to 540 pixels wide, degrading image quality on the Dashboard. (Some blog themes, such as Optica, will also expand inline images.) For best results, either embrace the 540-pixel width or keep inline image widths at 299 pixels or fewer.
