HOW IT WORKS
Inspect a favicon file
Read its dimensions and file size and check whether the image is square and at least 32×32.
Image or ICODimensions + suitabilityRuns locally
01Image or ICO
02Decode image metadata
03Dimensions + suitability
A square image of at least 32×32 is reported as broadly suitable.
One favicon file does not cover every platform perfectly
The checker also suggests common variants such as 32×32, 48×48 and 180×180 where appropriate.
Your content stays in the browser
Processing runs locally in the page without requiring the content to be sent to UtilityLake.
02
In short
What exactly does it do?
Read its dimensions and file size and check whether the image is square and at least 32×32.
Example?
A square image of at least 32×32 is reported as broadly suitable.