Resize 46 Images to 4:3

I have 46 product photos ready for my Shopify store. I simply need each one converted to a clean 4:3 aspect ratio while keeping the subject perfectly centered. Where cropping alone leaves empty space, please extend the canvas with a plain white background so the composition still looks natural and uncluttered.

Quality matters: the current resolution must be preserved, and every final file—both the JPEG and its matching WebP—should stay under 5 MB. No other edits are required; brightness, contrast, or object removal are not part of this task.

You’ll receive a folder of the originals and can use Photoshop, GIMP, Affinity, or any reliable tool you prefer. When finished, deliver:

• 46 JPEG files at 4:3
• 46 WebP versions at 4:3
• Identical filenames for each pair for easy bulk upload

A quick turnaround is appreciated so I can update the store without delay.