If you have cPanel with your hosting, it has a great feature under the Files area called Images.
You're right in wanting to resize and this cPanel feature will let you do that AND save the original. You'll be using the Scaler mode to make the changes. And, you can "drill down" to the directory where your files are loaded. Hopefully, the manufacturers directory. Once you see your files, click on SCALE.
Most Time to Interactive delays in e-commerce are the result of the graphics used beeing too large and the browser having to resize them prior to "printing" the page to the screen.
If all images are square, I suggest changing them to 500px x 500px.
If the images are portrait (taller than they are wide), set the height to 500px and keep the original ratio for the width.
If the images are landscape (wider than they are tall), set the width to 500px and keep the original ratio for the height.
Doing that arranges so that all your images will fit into a 500 x 500 space. It makes everything flow better.
You may find free programs available on the internet but, the cPanel method is really a nice feature.
NOTE: If you use this method and any of your images are smaller than 500 x 500, DO NOT use this method to make the image bigger. It pixelizes the image and really looks unprofessional.
The non-cPanel method is located at
https://docs.zen-cart.com/user/images/images_howto/
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