In practice, a PDF's page size often determines whether it prints cleanly, archives correctly, or embeds smoothly in another system. A report designed for A3 may need to be reduced to A4 for distribution, or scanned pages may need to be standardized to a custom size. Adjusting pages one by one is slow and error-prone; a Python script is a more reliable way to handle the job in batch.

Free Spire.PDF for Python is a lightweight, capable tool for this task. It has a small footprint and a straightforward API, which makes it well-suited to page-level restructuring.…