Crop or rotate a PDF in Preview on Mac
You can crop a page of a PDF to hide content, or rotate it to change its orientation.
Crop a PDF
To crop a PDF, you first select the area you want to keep, and then discard the rest.
Go to the Preview app
on your Mac.Open the PDF you want to crop, click
(if the Markup toolbar isn’t showing), then click 
.Select the portion of the page you want to keep.
If you want to view the dimensions of the content you’re selecting, choose Tools > Show Inspector, then click
and choose a unit of measurement.Click
in the Markup toolbar.Note: To undo the crop immediately, choose Edit > Undo Crop. To undo the crop later, find a version of the file before the crop. Choose File > Revert To > Browse All Versions, then find the one you want.
Rotate a PDF
Go to the Preview app
on your Mac.Open the PDF you want to change.
Do one of the following:
Rotate one page: Click
to rotate the page to the left. Continue clicking to keep rotating.To rotate a page to the right, press and hold the Option key and click
until you’re done rotating the page.Rotate several pages at once: Choose View > Thumbnails or View > Contact Sheet, select the pages to rotate, then click
to rotate the pages to the left.To rotate the selected pages to the right, press and hold the Option key and click
until you’re done rotating the pages.