How do you reduce picture size to 10 MB using mac?

To reduce a picture size to 10 MB on a Mac, you can use the Preview app. Open the image in Preview, then go to "File" and select "Export." In the export dialog, adjust the "Quality" slider to reduce the file size, and check the estimated size. Alternatively, you can resize the image dimensions by selecting "Adjust Size" from the "Tools" menu before exporting.