HowtofixaPDFthatscannedinreverse
Feed a stack face-up into a scanner that reads from the top and you get a perfect document in exactly the wrong order. It is one of the most common scanning faults and one of the fastest to fix — certainly faster than scanning the stack again.
3 minute read · Advorize PDF Tools
Why it happens
A document feeder takes the top sheet first. If you loaded the stack with page one on top and face up, the scanner reads the last physical sheet as its first image, and the PDF comes out reversed end to end.
Some scanners have a reverse-order setting to compensate. If yours does not, or you have inherited the file from someone else's scanner, flipping the finished PDF is the equivalent fix.
Check these two things on the same file
- Orientation: the same loading mistake often produces pages that are 180° out as well as reversed. Rotate them once, for the whole document.
- Blank backs: a duplex scan of single-sided paper leaves an empty page between every real one. Delete the even-numbered pages.
Doing all three in sequence — reverse, rotate, delete — takes about a minute and produces a document nobody would guess had been scanned badly.
Reversing only part of a document
If only the second half came out backwards, the organise tool takes a descending range: 1-4, 10-5 keeps the first four pages as they are and flips the rest.
The tool
Reverse PDF
Flip the page order back to front in one click.
Questions people ask
Almost never. Reversing a finished PDF is one click, and rescanning risks a fresh set of feed errors on the same stack.