Interleave two scanned PDFs into page order
A duplex-less feeder makes you scan all fronts (1, 3, 5…) then flip the stack and scan all backs. The two files are in opposite orders; pairing them by hand page by page is begging for mistakes. We zip them together: front 1, last back, front 2, second-to-last back…
Drop your files here — or click to choose (2+ files)
two PDF files: front sides, then back sides · up to 200MB each · processing starts instantly, preview is free
反面扫描件开头因空白页产生的偏移，从其开头跳过 N 页再交错
No signup needed. Only pay if you want the clean file.
How it works
- Upload the front-sides PDF first, then the back-sides PDF (order matters).
- Set back_offset if the back scan starts with blank pages (default 0).
- Download the merged PDF in true reading order.
Frequently asked questions
Which file goes first?
Fronts first (pages 1, 3, 5…), backs second. The back stack is consumed in reverse, as it comes off the flipped stack.
Uneven page counts?
Leftover pages from either stack are appended at the end in their natural order — nothing is dropped.
When this tool is not the right choice
You just need plain concatenation.
Use Merge PDF (ordered).
Use Merge PDF (ordered).