One of your three reports is full of landscape charts. The other two are standard portrait. You need them in one file, and you don't want to flatten the landscape pages — they're meant to be read sideways.
Flint preserves each page's rotation through the merge. Here's what that looks like.
Rotation is per-page, not per-file
PDFs store an orientation hint on each page. Flint reads that hint, copies it across to the merged file, and your landscape pages stay landscape, portrait pages stay portrait. Open the merged file in any reader and pages display in their intended orientation — no manual rotation needed in the reader.
When you DO want to normalise rotation
Sometimes mixed rotations are wrong rather than intentional. A page that was scanned sideways doesn't belong on its side. Spot any thumbnails in the merge interface that look upside-down or sideways and shouldn't be? Click the rotate icon on that card before merging. Or merge first and use rotate PDF pages on the specific pages.
Printing mixed-rotation PDFs
Most printer drivers handle mixed rotations correctly — landscape pages print landscape, portrait print portrait, all on the same paper size. If yours flattens everything to portrait and crops your charts, look for 'auto-rotate and centre' in print settings, or print landscape sections separately.
Why some viewers misshow rotation
Older PDF readers may ignore page rotation hints and render everything portrait. Modern viewers (Acrobat, Preview, Edge, browser PDF viewers) respect them correctly. If your recipient sees rotated content sideways, they're on an old viewer — recommend they update or open in their browser.
FAQ
Will printing land pages on different paper sizes?
Page size and rotation are separate. Merging preserves both. A landscape A4 page stays landscape A4.
Can I rotate all pages of one source file but not another?
Yes. The thumbnail strip lets you rotate any subset before merging.
Does Flint detect upside-down scans automatically?
Not automatically. You'd spot them in the thumbnail strip and fix manually, or use auto-orient features in your scanner software.
What's the difference between rotation and orientation?
Practically they're the same here — both refer to which way the page reads. PDF tooling sometimes uses them interchangeably.
Landscape, portrait, sideways — all coexist in one file. Merge mixed PDFs.