When the pages are all there but in the wrong order
Scanners are the usual culprit. A double-sided stack fed through a single-sided feeder comes back as all the fronts followed by all the backs, in reverse. A document assembled from three sources arrives with the appendix in the middle. Someone signed page six and sent it back as page one.
Reordering by dragging is faster than describing what is wrong, and it lets you fix ordering and remove junk in the same pass rather than running two tools.
How to use it
Every page appears as a thumbnail in a grid. Drag them into the order you want; drop the ones you do not need. The grid is the document — what you see is what gets exported.
This matters for interleaving in particular. Fixing a front-then-back scan by hand means moving pages one at a time in exactly the right sequence, and being able to see the whole document while you do it is the difference between two minutes and twenty.
Where it comes up
Assembling a tender or application pack in the order the checklist demands. Fixing a duplex scan. Putting a signed page back where it belongs. Moving an executive summary to the front where it should have been.
It also works as a light review step: seeing all the pages at once is how you notice the one that scanned blank.
The duplex scan, step by step
This is the case that sends people looking for a page organiser, so it is worth spelling out. Feed a double-sided stack through a single-sided scanner and you get every front in order, followed by every back in reverse order, because the stack was flipped as a block.
For a ten-sheet document that means pages 1, 3, 5, 7, 9, then 10, 8, 6, 4, 2. The fix is to take the last thumbnail and drop it after the first, the second-to-last after the second, and so on — interleaving from the end.
Doing that in a viewer that shows one page at a time is miserable. Doing it in a grid where you can see the whole document is a minute's work, and the page numbers printed on the sheets give you an immediate check that you got it right.
What happens to your files
Every one of these runs in your browser. The file is read from your disk, processed in memory and handed back as a download — there is no upload, no server copy and no account.
Pages are copied into their new positions unchanged — no re-rendering, no quality loss, text stays text.
Frequently asked questions
Can I reorder and delete at the same time? Yes. Drag pages into position and drop the ones you do not need in the same pass, then export once. Doing both at once matters for a duplex scan, where you are usually fixing the order and dropping blank backs in the same operation.
How do I fix a scan where all the fronts come before all the backs? Drag the back pages into place between the fronts. Seeing the whole grid at once is what makes that practical. The interleaving pattern is predictable — fronts in order, then backs in reverse — so once you see it the fix is mechanical.
Does the exported file lose quality? No. Pages are copied as they are into their new order. Reordering only changes the sequence in which existing pages are written out, so there is nothing to degrade.
Is my document uploaded? No. The rearranging and the export both happen in your browser. Thumbnails are rendered in your browser from the file you opened, which is why a long document takes a moment to display.
Related: Rotate PDF · Delete Pages · Merge PDF · All tools