macOS Preview
Batch convert images to other file formats
Use Preview and Finder to batch convert multiple images at a time to different file formats
• App credit: Apple Inc
There are several dozen different file formats, and you may end up with many types of image file on your Mac. The iPhone saves HEIC images, but you might need them as JPEGs for sharing on social media or with friends. Images downloaded from the web may be in PNG, GIF or WebP, and TIFF is popular with some applications.