PDF margins crop

[pajakpawel]

Hey!
I need to crop margins (left, right, bottom and top) from every page of a given PDF.
I found Issue #617 where I read that cropping pages margins is pretty easy when I know margins values.
And here comes my question. How can I get margins values for current page?

[JorjMcKie]

That's not easy, because there is no official PDF property to read this out.
You only can compute the maximum (union) rectangle for things on the page.
This computes the union of all text and images:

rect = fitz.Rect()  # start empty
for b in page.get_text("blocks"):
    rect |= b[:4]  # join block rectangle into the total

If you want to be overly diligent, also look for any drawings (these are not images!):

for path in page.get_drawings():
    rect |= path["rect"]

[pajakpawel]

That works great, thanks a lot!