1
EWWW Image Optimizer Partial
Free lazy load auto-scales placeholders; full on-the-fly scaling needs Easy IO.
94feature score
WordPress Image Optimization Plugins with Adaptive image sizes
Serves the right size for each screen or device. 4 of the 8 plugins we track include it.
2
Smush Paid version Pro
Automatic resizing serves images sized to their containers.
92feature score
3
ShortPixel Image Optimizer Via add-on
Free ShortPixel Adaptive Images plugin serves viewport-sized images via CDN (uses credits).
90feature score
4
Optimole Included
Resizes each image to the visitor's exact display size and pixel density.
77feature score