JPG / JPEG
FormatsA lossy raster format that compresses photos into small files, ideal for creatives full of color and gradients. It has no transparency, and every re-save throws away a little more detail, so don't keep re-exporting the same JPG. The go-to for photographic ad images where file weight matters.
Example
A full-bleed product photo saved as JPG at 80% quality often lands under 200 KB.