this script groups them into 6 standard digital buckets (Square, Portrait, Landscape, Ultrawide) plus an "Other" catch-all, keeping your final folder count down to around 10 or fewer.

ratios.py

from PIL import Image
import os
import shutil


def get_aspect_ratio(image_path):
    with Image.open(image_path) as img:
        width, height = img.size
        aspect_ratio = float(width) / float(height)
    return aspect_ratio


def get_all_aspect_ratios(directory):
    image_files = [f for f in os.listdir(directory) if
                   f.lower().endswith(('.png', '.jpg', '.jpeg', '.gif', '.bmp', '.tiff'))]

    aspect_ratios = {}

    for image_file in image_files:
        image_path = os.path.join(directory, image_file)
        try:
            aspect_ratio = get_aspect_ratio(image_path)
            aspect_ratios[image_file] = aspect_ratio
        except Exception:
            continue

    return aspect_ratios


def get_bucket_name(ratio):
    # Match the ratio against common standard buckets with a small tolerance window
    if 0.95 <= ratio <= 1.05:
        return "1_square_1-1"
    
    # Landscapes (Width > Height)
    elif 1.25 <= ratio <= 1.40:
        return "2_landscape_4-3"
    elif 1.41 <= ratio <= 1.60:
        return "3_landscape_3-2"
    elif 1.61 <= ratio <= 1.85:
        return "4_landscape_16-9"
    elif ratio > 1.85:
        return "5_landscape_ultrawide"
    
    # Portraits (Height > Width)
    elif 0.70 <= ratio <= 0.80:
        return "6_portrait_3-4"
    elif 0.60 <= ratio <= 0.69:
        return "7_portrait_2-3"
    elif 0.50 <= ratio <= 0.59:
        return "8_portrait_16-9"
    elif ratio < 0.50:
        return "9_portrait_tall"
    
    else:
        return "10_other_ratios"


if __name__ == "__main__":
    directory_path = "./"
    
    aspect_ratios = get_all_aspect_ratios(directory_path)

    grouped_buckets = {}
    for image_file, aspect_ratio in aspect_ratios.items():
        bucket_name = get_bucket_name(aspect_ratio)
        if bucket_name not in grouped_buckets:
            grouped_buckets[bucket_name] = []
        grouped_buckets[bucket_name].append(image_file)

    print("Organizing images into standard ratio buckets...")
    for bucket, files in grouped_buckets.items():
        folder_name = os.path.join(directory_path, bucket)
        
        if not os.path.exists(folder_name):
            os.makedirs(folder_name)
            
        for file in files:
            source_path = os.path.join(directory_path, file)
            destination_path = os.path.join(folder_name, file)
            
            shutil.move(source_path, destination_path)
            print(f"Moved {file} -> {folder_name}/")

    print("\nSorting into main buckets complete!")