How to Make JPG Smaller on Macbook

By Mario Calhoun

A large JPEG image on your MacBook is useful for design work, but sending it via email can be troublesome, as many Internet service providers (ISPs) limit the size of attachments. Thankfully, your computer has a built-in image editing application that enables you to reduce the size of images. When editing images, create a copy of the original file rather than altering the only available copy of the image.

Preview Photo Reduction

Step 1

Click the "Go" menu at the top the MacBook's screen and click "Applications." Double-click "Preview" in the "Applications" window to open the photo-editing application.

Step 2

Click the "File" menu, and then click "Open." Click the photo you wish to edit and select "Choose" in the pop-up dialog box to open the photo in Preview.

Step 3

Click the "Tools" menu at the top of the application and click "Adjust Size."

Step 4

Type the new size in the "Size Adjustment" window and press "Return" on your keyboard to apply the new file size.

Step 5

Click the "File" menu, and then click "Save As." Enter a new name for the photo and click "Save."

iPhoto JPG Reduction

Step 1

Double-click "iPhoto" in the "Applications" folder in "Finder." Click the "File" menu.

Step 2

Click "Import to Library" and double-click the JPG you want to edit in iPhoto.

Step 3

Click the file in iPhoto to highlight it, and then click the "File" menu. Click "Export" and click "File Export."

Step 4

Click "JPEG" in the "Kind" drop-down menu, and then click "small" or "medium" from the "Size" drop-down menu. The "small" option is suitable for emailing the file and uploading it to a website, whereas "medium" is suitable for users with high-speed Internet.

Step 5

Click "Export" and choose the save location for the image. Click "OK" to finish the resizing process.