JPG, and use it. When you have finished you can either copy the image to your computer, or save it as a JPG.   How to Reduce the size of a JPEG on your computer? — Quora Jun 3, 2023 — Open the JPEG file that you wish to change its size in Preview and choose adjust size” for all dimensions from the drop-down menu. When the image loads up in Preview, click on to view the file in full resolution and adjust the size. Click on Save as JPG and choose the quality preset for saving it as an image. Save as JPG.  The first method is useful if you don't want to upload the original file to the camera roll, and you're using Mac OS X version 10.11 or later. How to reduce the size of a JPEG on a Mac — Apple Insider Feb 6, 2023 — If you take a photograph in an image editor, like Photoshop, you can use the save as JPG option to compress the image. This allows you to save large quality JPEG files. How to Reduce the Size of a JPEG on Your Mac — Apple Community Nov 28, 2023 — In JPEG or JPEG2000 you can right-click, if you are in Preview or Finder, and 'Adjust size/resolution to see the original. Right click, press 'Save image location', go to Applications ▸ Photo ▸ Photos ▸ Photos Viewer, click on the 'Original' folder and then right click again and choose 'Save image location'.