HOW IT WORKS
Estimate encoded image size
Actually re-encode the image using the chosen JPEG or WebP settings and measure the resulting Blob.
Image + encoding settingsEstimated sizeRuns locally
01Image + encoding settings
02Test encode → measure Blob
03Estimated size
The estimate reflects the actual browser encoder output for the chosen settings.
This is more concrete than a pixels-only estimate
Image complexity and encoder behavior affect compressed size, so UtilityLake measures a real re-encoding.
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?
Actually re-encode the image using the chosen JPEG or WebP settings and measure the resulting Blob.
Example?
The estimate reflects the actual browser encoder output for the chosen settings.