Your appendix ended up before chapter one. Your conclusion ended up before chapter five. The contract pages need page three before page two before page four.
Dragging thumbnails to fix order is the obvious, fast solution. Flint does it visually.
The thumbnail grid
Open reorder PDF, drop the file, and every page appears as a thumbnail. The thumbnails are large enough to identify content at a glance — you'll see the chapter heading or the chart or the table that tells you where each page belongs. Drag any thumbnail to a new position. The other thumbnails make room.
Drag patterns that work
Single-page drag: grab a thumbnail, drop it. Multi-select drag: shift-click or cmd/ctrl-click multiple thumbnails, drag them together. Range drag: select first and shift-click last, drag the whole range. Flint maintains the relative order within a multi-select.
Save and review
When the grid shows your intended order, hit 'save'. The reordered PDF downloads. Open it to confirm. Pages flow in your new sequence; original is untouched on disk.
Combine with other operations
Reordering doesn't preclude other fixes. Spot a page that's also rotated wrong? Rotate within Flint or use rotate PDF pages. Spot a page that shouldn't be there? Delete it. Want to add a new page to your reorder? Use merge after reordering to insert the addition.
FAQ
Can I undo a drag?
Yes, within the session. Or drag the page back to its original position. Flint shows the live grid until you save.
Do bookmarks survive reordering?
Yes. Bookmarks track their target page and follow them to the new position.
What about hyperlinks?
Internal links remap to the new page positions.
Maximum number of pages?
Thousands work fine. The grid scrolls; performance stays smooth.
Drag, drop, save. Reorder visually.