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How to Interleave Pages From Two PDFs

Last updated: February 24, 2026

You scanned a double-sided document by scanning all front pages first, then all back pages. Now you have two PDFs that need to be interleaved — front page 1, back page 1, front page 2, back page 2, and so on. OneClickPDF's interleave tool merges two PDFs by alternating their pages.

Step-by-Step Guide

1

Open the Interleave Pages tool

Go to the Interleave Pages page on OneClickPDF.

2

Upload both PDF files

Upload the first PDF (e.g., front sides) and the second PDF (e.g., back sides). Both load in your browser.

3

Configure interleave options

Choose whether to reverse the second PDF (common for back-side scans that come out in reverse order). Preview the interleaved page order to verify it's correct.

4

Interleave and download

Click Interleave. The tool creates a new PDF with alternating pages from both files. Download the properly ordered document.

Interleave Pages

Alternate pages from two PDFs — perfect for duplex scans.

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Frequently Asked Questions

What if the second PDF needs to be reversed?
When scanning back sides, the stack often comes out in reverse order (last back page scanned first). Enable the reverse option for the second PDF to correct this automatically.
What if the PDFs have different page counts?
If one PDF has more pages than the other, the extra pages are appended at the end after interleaving is complete.
Can I interleave more than two PDFs?
The tool works with two PDFs at a time. For more complex interleaving, process in pairs or use the Organize tool for manual page arrangement.
Does interleaving affect page quality?
No. Pages are copied losslessly from both source PDFs. No rasterization or quality loss occurs.

The interleave tool solves the classic double-sided scanning problem in seconds. No more manual page-by-page reorganization — just upload both stacks and let the tool alternate them perfectly.

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