Alternate Merge PDF — Interleave Pages from Two PDFs
Interleave the pages of two PDFs, taking one page from each alternately. Perfect for assembling double-sided scans.
How to alternate merge PDFs
- 1Upload the first PDF (odd pages / front sides)
- 2Upload the second PDF (even pages / back sides)
- 3Optionally enable 'Reverse second file' for duplex scans
- 4Download the interleaved PDF with pages in correct order
Features
- Interleaves pages from two PDFs in alternating order (1-2-1-2)
- Optional reverse mode for the second file (for duplex scanning)
- Handles PDFs with different page counts gracefully
- Browser-based — files never uploaded to a server
Use cases
- Assemble a double-sided document from two separate scan passes
- Combine odd and even pages scanned separately into one PDF
- Interleave a blank-page PDF with a content PDF for note-taking
FAQ
What is this used for?
Combining odd and even pages from a duplex scanner that scans each side separately in two passes.
What if the two files have different page counts?
Remaining pages from the longer file are appended at the end in order.
Why would I reverse the second file?
Many flatbed scanners scan the back sides of pages in reverse order. Enabling reverse corrects the page sequence automatically.
Can I interleave more than two PDFs?
Currently only two PDFs can be interleaved at once. For more files, merge pairs step by step.