Crop a PDF for iPad Mini

import fitz  # PyMuPDF
import sys

input_path = sys.argv[1]
output_path = sys.argv[2]

TARGET_RATIO = 1488 / 2266  # ≈ 0.6569 (portrait iPad Mini 7)

doc = fitz.open(input_path)
for page in doc:
    rect = page.rect
    height = rect.height
    target_width = height * TARGET_RATIO
    crop_left = (rect.width - target_width) / 2
    new_rect = fitz.Rect(crop_left, 0, crop_left + target_width, height)
    page.set_cropbox(new_rect)

doc.save(output_path)