How to get the format of image with PIL?

Try:

from PIL import Image

img = Image.open(filename)
print(img.format)  # 'JPEG'

More info

• https://pillow.readthedocs.io/en/latest/reference/Image.html#PIL.Image.Image.format

• https://pillow.readthedocs.io/en/latest/handbook/image-file-formats.html