PDF pages can be rotated 0, 90, 180, or 270 degrees. To rotate pages with the user interface (UI), simply open the pages panel, select a page or a group of pages, right-click and select Rotate pages. You can also press Ctrl + Shift + R on the keyboard to open the page rotation UI.
When a page is not rotated (0 degrees), and it gets rotated clockwise by 90 degrees, the page rotation is 90 degrees, continuing clockwise by 90-degree increments produces rotations of 180, 270, and back to 0. You can also change page rotations with a script. The document setPageRotations( ) method takes four input parameters:
nStart - The zero-based start page of the range of pages to rotate.
nEnd - The zero-based end page of the range of pages to rotate.
nRotate - The degrees of rotation (0, 90, 180, 270).
/*The following script sets the page rotation of pages 1 through 10 to 90° */
this.setPageRotations(0, 9, 90);
Is The Page Rotated?
A page might appear as “landscape” view, but depending on how it was produced, it could have any page rotation. It could be a portrait 8.5" x 11" page rotated 90 degrees. It could also be an 11" x 8.5" page with a degree rotation of zero. I have even seen pages with 180° rotation (upside down) that look right-side up because of the way they were fed through a scanner, coming out upside-down with zero rotation, then rotated to right-side up with 180° rotation.
