Some unfortunate sequence of events — scanner fed wrong, document opened in a tool that auto-flipped, an export that mis-handled orientation — left every page of your file upside-down. Or just one page is. Either way, the fix is the same.
Flint flips with a 180° rotation.
Whole-document flip
Open rotate PDF pages, click 'select all', click '180°'. The entire document rotates. Every page is now the right way up. Save the file.
Single-page flip
If only one page (say page 17) is upside-down, scroll to it in the thumbnail grid, click that page, click '180°'. Only that page flips. Pages 1-16 and 18-end stay as they were. Save.
Range-based flips
Mixed cases: pages 1-30 are correct, 31-60 upside-down, 61-90 correct. Range-select '31-60', apply 180°, save. Two operations total — selection and rotation — fix any number of consecutive pages.
Avoid the double-flip trap
If you accidentally apply 180° to a page that was already correct, it's now upside-down. Just apply 180° again — the second flip restores the original. Or use 'reset all changes' before saving if you've gotten confused. Save only when the thumbnail grid shows everything reading correctly.
FAQ
Why are scanned pages upside-down sometimes?
Document feeders pull stacks based on how you loaded them. Wrong stack orientation = upside-down output. Auto-orient settings (if your scanner has them) prevent this.
Does 180° change page size?
No. Page width and height are preserved.
Will printed pages come out right?
Yes, if rotation is saved into the file (Flint does this). View-only rotation in some readers doesn't reach the printer.
Can I apply different rotations to different pages in one go?
Yes. Select group A, rotate. Select group B, rotate. Save once at the end.
One click, upside-down fixed. Flip upside-down pages.