I'm developing a demo image upload service and need to create thumbnails of user-uploaded images. I'm curious about best practices: how many thumbnails do services like Twitter and Instagram typically create, and what sizes do they use? Do they choose sizes based on the design of their UI (e.g., if the feed is 1000px wide, they might make thumbnails 1000px for desktop), or are there technical considerations involved?
1 Answer
Most platforms nowadays stick to a responsive design approach. For thumbnails, it’s common to generate multiple sizes like small (150-300px), medium (600-800px), and original size. Services like Twitter and Instagram balance their choices between user interface needs and technical standards—think of retina display requirements where images need to be at 2x or 3x resolution. For your demo, a simple plan could be creating a few standard widths like 320w, 640w, and 1024w, and using the srcset attribute in your HTML. This allows the browser to select the most suitable one based on the viewer’s device.
I was planning to keep it simple with sizes of 400, 800, and the original, which will only be shown on hover or download. I’ve seen some image repositories use similar sizes. I know that 400px is a good size too since many AI models require that minimum for content detection.