Alternate & mix.
Scanned a double-sided document on a single-sided scanner? You end up with two PDFs — all the fronts, then all the backs. Drop both in and they zip together A1 B1 A2 B2… into reading order. If the backs came out last-page-first (they usually do), tick Reverseand it's handled. Lossless, on your device.
1
Open both PDFs
The odd pages (fronts) and the even pages (backs).
2
Set the order
Reverse the second file if the backs were scanned last-first.
3
Mix & download
Pages interleave A1 B1 A2 B2… into one PDF, losslessly.
Processed on your deviceNo uploads, everNo sign-up & free
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