How to pixelate / blur part of an image in Mac Preview?

I have a screenshot of a web UI and I wish to blur the parts that are not relevant to the point being demonstrated, is there a way to blur / pixelate part of an image using Mac Preview?

Note: the top ranking google result offers a highly substandard solution resulting in an obtrusive rectangle in place of the parts you want blurred - this is really not the same as subtle blurring that obscures information with minimal aesthetic interference with the look of the image.

Solution 1:

Thanks @benwiggy for correctly pointing out that Preview is insufficiently complex to perform a blur.

The application I used was free, and available on App Store - it's called 'Skitch': https://apps.apple.com/au/app/skitch-snap-mark-up-share/id425955336

The bar on the left hand side as a 'blur' icon, simply press it and blur out whatever you need to:

Solution 2:

Open your image, shrink the window until the part of the image is unrecognizable, and take a screenshot of the part of the image. Then paste this screenshot back into preview and resize it over the section you wish to be pixelated and save this as a new image.

Solution 3:

Preview is not a fully-fledged image editor, and has very limited capabilities.

Conceivably, you could export duplicate copies of the image with low-quality JPEG-ing until the image is unrecognisable, and then paste the relevant area onto the original. It might also be possible to lower the resolution of the duplicate image sufficiently with built-in OS tools.

But ideally, you will need a third-party image editing app with a Blur Tool.