The main reason you get this error is because your image resolution is too low.
For apparel, Google Shopping requires images to be at least 250 x 250 pixels, and for non-apparel (everything else), Google Shopping requires images to be at least 100 x 100 pixels.
How to solve the “Images too small” problem?
The most obvious thing you can do is take new images of your products to ensure they are high quality.
What if your images are really close to the requirements, but slightly under?
We can fix this problem by adding padding with the background color of your image.
For example, if your image is too small in one dimension, like 122 x 98, you can add a pixel on both sides of the 98 to create a new image that is 122 x 100.
1. Original image
2. Image with height added
3. Additional Pixel colored in
Feel free to reach out below if you need help with fixing Google Shopping “images too small” errors.