PNG vs JPG vs WebP: Choosing the Right Image Format for the Job

The format question usually gets answered by habit rather than by what the image actually is. Screenshots get saved as PNG out of muscle memory, photos default to JPG because that's what a camera outputs, and WebP gets ignored because it's the newer name in the list. The right choice depends on one thing more than any other: is the image mostly flat color and sharp edges, or mostly continuous tone and gradients.

What each format is actually good at

PNG uses lossless compression, which means it reproduces the source pixel-for-pixel with no quality loss, at the cost of much larger files for anything photographic. It's the right call for screenshots, logos, icons, diagrams, and anything with flat color regions and sharp text, since lossless compression handles those patterns efficiently. It's also the only one of the three with full alpha transparency support that's been universally supported for decades.

JPG uses lossy compression tuned for photographs: it throws away detail a human eye is less likely to notice in continuous-tone images, and does it badly on sharp edges and text, which is why a JPG screenshot often looks faintly smudged around icons and letters. For actual photos, that tradeoff is usually invisible and the file size savings are large.

WebP does both lossy and lossless compression in one format, and its lossy mode typically beats JPG at the same visual quality, often by 25-35% smaller. Its lossless mode also usually beats PNG. It supports transparency too. The catch used to be inconsistent browser and software support; that's mostly resolved now, with every major browser supporting it and most modern editing and CMS tooling handling it natively.