How to get all images in all layers to trim to center and resize canvas in Photoshop?

Question

Let me try to explain this:

• I have a canvas that is 400 X 400
• I have 3 layers
• Layer I image is 100 X 100
• Layer II image is 200 X 200
• Layer III image is 300 X 300

I want ALL images in all layers to convert to 100 X 100 sized and have canvas convert to 100 X 100

In other words, I multiple trim/resize as a batch, is this even possible?

Answer 1

Select the layer that are bigger than 100px and resize it to 100px: Window > Properties

set the bounding box to W: 100 and H: 100

then select all layers, right click > Quick Export as PNG to save all the layers as .png. The canvas size and image position doesnt matter, as long as you have it to 100x100px and use Quick Export as PNG the output will be the size of the layer.