Resizing photos in Big Sur Preview broken

I am not having an issue resizing. Adjust Size works just fine, however, Finder does not update the file size info for the image icon. It seems to stay the original size until the system is rebooted or Finder is relaunched. Have you tried opening the resized image in another program to verify?

I came across this post in search for another Preview size adjustment issue. When I resize an image, it saves fine, but during the saving process, it creates a "document" file the same size as the image file. This document file does not self remove and I am being forced to trash them. I am assuming it's some sort of data backup of the image, but this never happened in Mojave.

LutherP wrote:

I have installed Big Sur MacOS 11 and now the resize option in Preview does not work. The options are there and I drag the toggle across to a smaller file size but the file size stays the same and saves no smaller. This behaviour is identical in the Save As function and in the Adjust Size function. Is this broken or is Apple messing with every created and blogger trying to down size photos?

Resize, rotate, or flip an image in Preview on Mac - Apple ...

Me too, dammit.

I too am finding this exact issue. I'm a garden blogger and its causing real issues in trying to upload content to my site as now my image files are about 3x the size when I upload them!

Friends', the tools' adjust size option works beautifully, with the display of an estimated size in kb.