Rotate PDF 90 Degrees

A single 90-degree rotation applied to every page is the right choice specifically when a document was scanned or fed through a device consistently sideways from start to finish — every page needs the identical correction, so there is no reason to specify a page range at all. This is common with sheet-fed scanners loaded with landscape-oriented paper, or a document originally created in landscape layout and scanned by equipment that assumes portrait pages.

Clockwise is the direction offered by default because it is the more frequent correction needed in practice; if a document instead needs a counterclockwise quarter turn, rotating 90 degrees clockwise three times in a row lands on the same result, since a full rotation cycles back to the original orientation every 360 degrees.

When several scans share the same misorientation — a batch pulled from the same scanning session, all fed in the same way — this preset applies identically to each one, since the correction genuinely is uniform across the whole batch. Worth checking the first output carefully before processing the rest, though: if even one document in the batch was scanned differently, applying a blanket rotation to all of them will fix the majority and introduce the same problem into whichever ones were already correct.