Learn just enough to decide well
Image guides
Four short, no-nonsense guides on which format to use, how much to compress, and why your iPhone saves photos in that odd format.
Guides to understand your images
What a HEIC file is
Why the iPhone uses HEIC, and what you gain and lose by converting.
GuideJPG, PNG or WebP
The real difference between JPG, PNG, WebP and AVIF, and when to use each.
GuideCompress without losing quality
The right balance between weight and quality, with a repeatable recipe.
GuideOptimise images for the web
Size, format, lazy loading and dimensions: halve your site's weight.
Guide