Someone fed the document into the scanner upside-down. Now every page is upside-down. The text is technically there but unreadable without turning your head sideways — or upside down.
180-degree rotation fixes this in one click. Flint has the preset.
The 180° preset
Open rotate PDF pages, select all pages (or just the upside-down ones), click '180°'. Every selected page flips. Save. Open the file — everything reads correctly.
Or click 90° twice
Two 90° clicks (clockwise) equals one 180° flip. Some users find this more intuitive than picking a preset. Either path produces the same result. The PDF doesn't care which way you got there.
Partial document upside-down
If pages 1-30 are correct but pages 31-60 are upside-down, range-select pages 31-60 in the thumbnail grid, apply 180°, save. The first half stays put, the second half flips.
Double-check before saving
Glance at thumbnails after rotating to confirm everything reads the right way up. If one page flipped wrongly (was actually correct before), select just that page and rotate it 180° back. Save when the whole grid looks right.
FAQ
Does 180° change page dimensions?
No. Unlike 90° or 270°, 180° preserves width and height. The page is still its original shape.
What if my PDF mixes upside-down and correct pages?
Select just the upside-down ones. Flint applies rotation per-selection.
Will text stay selectable?
Yes. The text layer rotates with the page. Highlight and copy still work.
Why did my scanner do this?
Document feeders sometimes pull stacks upside-down. Some have an 'auto-orient' setting — find it and switch it on to prevent next time.
Upside-down to upright in one click. Rotate 180°.