Hit the Delete key, or go to the Edit menu and select “Cut” to remove everything that was highlighted red with the Alpha tool (note: if the original image was a format that does not support transparency, you will be asked to convert the document, choose “Convert” to proceed” as expected.Click and hold on the part of the image you want to turn transparent, and while still holding move the cursor up or down to either select more or less of the image to turn transparent – anything that is red is what will become transparent.

Select the “Instant Alpha” tool, which looks like a magic wand in the Editing Tools menu bar (in earlier Preview versions it is contained under the Selection pulldown menu if the image is smaller than certain widths).

For earlier Mac OS X Preview versions: Click the little pen icon in the toolbar to reveal the image editing tools.

Click the Toolbox icon in the toolbar of Preview app to reveal the image editing tools.

You can turn any image transparent with Preview, though you’ll find the resulting image must be saved as an image format that supports transparency.

How to Make a Transparent Image on Mac with Preview

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