Resize images so that their maximum dimension is 512 pixels

resize.py

import os
from PIL import Image

MAX_SIZE = 512

def resize_image(image_path):
    with Image.open(image_path) as img:
        img = img.convert("RGB")
        img.thumbnail((MAX_SIZE, MAX_SIZE), Image.LANCZOS)
        img.save(image_path)
        print(f"Resized {image_path}")

def main():
    for filename in os.listdir('.'):
        if filename.lower().endswith(('.jpg', '.jpeg', '.png')):
            resize_image(filename)

if __name__ == "__main__":
    main()

ResizeBulkImages.md

Resize a folder of images so that the maximum dimension is 512px (in width or height).

How to use

1. Install Pillow:

pip install pillow

2. Put resize.py in your folder of images

3. Run python resize_images.py

Blammo