How to Rotate a PDF on Mac (One Page or All)

A scan comes in sideways, or one landscape page interrupts a portrait report. Preview fixes both in seconds — two keyboard shortcuts rotate any page 90 degrees, the thumbnail sidebar rotates many at once, and saving makes the fix permanent for everyone who opens the file after you.

Rotate the page you're looking at

1. Open the PDF in Preview.
2. Press Cmd + L to rotate left (counterclockwise) or Cmd + R to rotate right — the same commands live under Tools → Rotate Left / Rotate Right.
3. Each press turns the page 90°; upside-down pages take two presses.
4. Press Cmd + S to save.

In a PDF, rotation applies to the page you're viewing, not the whole document — which is exactly what you want when one sideways chart interrupts an otherwise upright file. Wrong direction? Just rotate the other way; a 90° left cancels a 90° right, losslessly.

Rotate many pages — or the whole PDF

1. Choose View → Thumbnails to open the sidebar.
2. Select the sideways pages: Cmd-click individual thumbnails, Shift-click a range, or Cmd + A with the sidebar focused to select every page.
3. Press Cmd + L or Cmd + R — every selected page turns together.
4. Save with Cmd + S.

That select-all trick is the whole-document rotate: a batch of pages scanned 90° off becomes upright in one keystroke. For a scan where odd pages face one way and even pages the other (double-sided feeders do this), Cmd-click just the affected pages and rotate them as a group.

Make sure it sticks

Saving writes the rotation into the PDF's page metadata, so Acrobat, browsers, phones, and printers all honor it. Three things worth knowing:

• Locked or signed PDFs may refuse to save. Use File → Duplicate and save the rotated copy instead.
• Version safety net: if you over-rotated and already saved, File → Revert To → Browse All Versions… can restore the earlier state.
• Rotation vs. straightening: Preview rotates in 90° steps only. A scan that's crooked by a few degrees needs re-scanning — if the paper's still around, scanning with your iPhone auto-straightens as it captures.

Rotating images is different

The same shortcuts work on JPGs and PNGs in Preview, with one difference: images are a single "page," so Cmd + L rotates the whole thing. Faster still, skip Preview: select the image in Finder, right-click, and choose Quick Actions → Rotate Left — repeat for more turns. That route works on a multi-file selection too, which makes it the quickest fix for a folder of sideways photos. Quick Look has the same power: press Space on an image and click the rotate button in the preview's toolbar — the file is rotated and saved without opening anything at all.

Rotating for print vs. rotating the file

One distinction saves paper: if the PDF is correct on screen but you want it printed sideways — a wide table on landscape paper — don't rotate the pages. Use the print dialog's orientation control instead (Cmd + P, then the portrait/landscape buttons). Rotating pages changes the document for every future reader; orientation changes only how this print job lays ink on paper. The reverse also holds: if a PDF prints sideways everywhere, the pages themselves are rotated in the file, and the Cmd + L / Cmd + R fix above corrects it once, permanently, for everyone downstream.

Worth stating plainly: none of this costs quality. PDF rotation is a metadata change — the page's contents aren't re-rendered or recompressed, just displayed at a new angle — so you can rotate, save, reconsider, and rotate back with zero degradation, as many times as it takes to get a messy scan sorted.