How to rotate PDF pages on a Mac and keep the rotation
By Himanshu Ranjan · Updated 8 November 2026
In Preview, open the PDF, show thumbnails with View › Thumbnails, select the pages, click Rotate Left (hold Option for right), then save. To rotate every page in one or many files, run Organize › Rotate all 90° right, 90° left or 180° in FileDial. Both work offline.
Rotate in Preview when it is one file
Preview is already on your Mac and handles a few sideways pages well. Open the PDF, click the Rotate Left tool to turn the page counterclockwise, and keep clicking to keep turning it. To rotate right, hold the Option key and click the Rotate Right tool. To turn several pages at once, choose View › Thumbnails or View › Contact Sheet, select the pages, and use the same tool.
Then save the file. Apple's guide describes the rotation tools but a common surprise is closing the window without saving, which leaves the file as it was. Choose File › Save, or let Preview autosave as you go, and reopen the PDF to confirm the pages stay upright.
Rotate whole files with FileDial
When every page of a scan is sideways, or you have thirty scans from the same feeder that all came out the same way, rotating page by page is tedious. FileDial has three tools in the Organize category for this.
- Select the PDF, or several PDFs, in Finder.
- Hold the right Option key to open the dial and choose the Organize category.
- Release on Organize › Rotate all 90° right, Organize › Rotate all 90° left, or Organize › Rotate all 180°.
- Open the copy saved beside the original and check the first and last pages.
Choosing the direction
Think of the page as it appears on screen. If the top of the text points to the left, the page needs a 90° turn to the right (clockwise). If the top points to the right, it needs 90° to the left. If the text is upside down, use 180°, which avoids having to remember which way is which.
A mistake worth avoiding is rotating twice by accident. Because the tools write a new copy beside the original, you can open the copy, see it is wrong, and undo it from the result card, or just run the opposite direction on the copy.
- Text top points left: rotate 90° right.
- Text top points right: rotate 90° left.
- Upside down: rotate 180°.
- Only some pages wrong: use Preview thumbnails instead.
When only some pages are sideways
The three FileDial rotations apply to all pages, so they are the wrong tool for a mixed document where a landscape table sits in a portrait report. For that, Preview's thumbnail view is better because you select just the pages you want.
If the sideways pages come from a scanner that mixed orientations, consider whether the page is truly rotated or the scan is merely tilted a few degrees. A tilted page is a different problem; OCR › Straighten scanned pages… turns tilted pages into straightened pictures and keeps straight pages as they are.
Scans that still look wrong after rotating
If you rotate a scanned PDF and then search it, the search may find nothing even though you can read the page. That happens when the text layer was made before the page was turned. Run OCR › Make searchable, which adds an invisible text layer to pages that do not have text, so the file can be searched and selected again.
Also check the file size afterwards. Rotation should not change image quality, but a very large scan is a good moment to run Compress › Compress PDF, which keeps text selectable while images go to 144 dpi.
A quick routine for a batch of scans
If you scan documents every week, make rotation a habit rather than a repair. Scan a short test page first, see which way it lands, and then rotate every file from that session with the same tool. Because FileDial processes a whole selection in one go, thirty files cost the same effort as one.
Name the results so you can tell them apart. The tools save a copy beside each original, so a folder will hold both versions until you tidy it. Once you have checked a few pages from each batch, move the originals out of the way or delete them, and keep only the corrected files. If you want to keep the folder clean automatically, a watched folder can run a recipe on anything you drop in, which is how some people handle a daily scanner inbox.
Why it is worth doing locally
Scans of IDs, medical letters and contracts are the files most often sideways, and also the ones you least want on someone else's server. FileDial rotates on your Mac, works with Wi-Fi off, and writes a new copy so the original stays as the fallback.
Questions
Why does my PDF go back to sideways after I rotate it?
The rotation was probably not saved. In Preview, choose File › Save after rotating, then close and reopen the file to check. If you rotate with FileDial the result is written as a new copy beside the original, so open that copy rather than the old file.
Can I rotate just one page of a PDF in FileDial?
FileDial's rotate tools turn all pages in a file by 90° or 180°. To turn one page, use Preview: show thumbnails, select the page, click the rotate button and save. Or split the page out first with Organize › Extract pages…, rotate it, and merge it back.
Does rotating a PDF reduce its quality?
Rotating a page does not recompress its images, so quality should be unchanged. Size can change slightly because a new file is written. If you also want a smaller file, compress it as a separate step so you can compare the result with the rotated version.