Rotate PDF

Every PDF reader offers a rotate button, and in most of them it changes only what you are looking at. Close the file and the rotation is gone; send it to somebody else and they get it sideways exactly as before. That is why people end up searching for this.

The rotation here is written into the document, so the page is stored as turned. Anyone opening it afterwards — in any reader, on any device — sees it the right way up.

A document feeder that took a few sheets the wrong way round produces a file where most pages are fine and a handful are not. Turning the whole document would fix those and break the rest.

So the range box applies here too: name 3, 7, 11 and only those pages turn. And the rotation is added to whatever a page already had rather than replacing it, so a page that was already a quarter turn out and gets another quarter turn ends up upside down — which is what you asked for, and not what a tool that simply sets the angle would have done.

Ninety degrees clockwise moves the top of the page to the right-hand edge. That sounds obvious written down and is easy to get backwards while looking at a sideways scan, because the page is already turned and your sense of "top" has quietly moved with it.

The reliable method is to find a word you can read and ask which way it needs to swing to come upright, rather than reasoning about the page as a whole. If the result comes back the wrong way, applying another half turn is exact — three quarter turns and one the other way are the same thing here, because the rotation accumulates rather than being reset.

A scanner writes the page in the orientation the sheet went through the feeder, and a document with a mix of portrait and landscape sheets — a report with a wide table in the middle — comes back with the wide ones rotated. Nothing went wrong; the scanner recorded what it was given.

Some scanners also write a rotation flag rather than turning the image, which is why a file can look correct in one program and sideways in another. Writing the rotation into the document, which is what happens here, settles that disagreement: there is no flag left for a reader to interpret differently.

Turning a page does not re-render it. The text stays selectable and searchable, vector artwork stays sharp, and images are carried across untouched — a rotated page is the same page with a different orientation recorded against it, not a picture of one.

A practical consequence worth knowing: if the document has been through OCR, the recognised text keeps its original reading direction relative to the page content, so searching still works. Rotating does not require redoing the OCR, and it does not damage it.

A rotated PDF can still come out of a printer sideways, and the cause is usually not the file. Print dialogs carry their own orientation and scaling settings, and "fit to page" combined with a landscape sheet inside a portrait document produces results that look like the rotation failed.

Check the print preview rather than the file: if the preview is right and the paper is not, the setting is in the dialog. If the preview is wrong too, open the PDF in a second reader before rotating it again — that tells you whether you are looking at the document or at one reader’s idea of it.