Interleave PDF Pages

Alternate pages from two or more PDFs. Set the file order, choose how to handle unequal page counts, and save one combined document. Completely free to use.

or drop PDF files here

Files are processed locally. Nothing is uploaded.

Weave PDF Pages Into One Document

Combine separate page sequences by taking one page from each file per round. Two files A and B become A1, B1, A2, B2, and so on. This is useful for bringing together separately scanned fronts and backs, or alternating pages from related documents.

How to Interleave PDFs

Choose the source order and how to handle missing pages.

Add at least two PDFs

Add at least two PDFs

Select the files and enter any required passwords. Drag the file cards into the order you want.

Choose the interleave settings

Choose the interleave settings

Cycle through the list forwards or backwards. When a file runs out, skip it or insert blank pages. Enable second-file reversal if its pages were scanned backwards.

Combine and download

Combine and download

Click “Interleave PDF” and download the combined document.

Interleave PDF Pages: practical uses and limits

Alternate pages from separate PDF sources, such as front-side and back-side scan files. Check each source order first, including any reversed back-side scan, then inspect pairs in the assembled result.

Questions About Interleaving PDFs

How is this different from merging PDFs?
A normal merge places complete documents one after another. Interleaving takes a page from each source in turn, such as A1, B1, A2, B2.
Can I use more than two files?
Yes. Each round takes one page from every file in the selected list order.
What happens when the files have different page counts?
Choose to continue with the remaining files, or insert blank pages for files that have run out. Blank padding keeps every round the same length.
Does reverse file order reverse the pages within each PDF?
No. It changes which file supplies the first page in each round. The separate duplex-scan option reverses the page sequence of the second file.
How can I combine front and back scans?
Put the front-page scan first and the back-page scan second. If the back pages were scanned in reverse order, enable “Reverse the page order of the second file”. Check your scan sequence before saving.
Are my PDFs uploaded?
No. Interleaving happens locally in your browser. You need the correct passwords for protected sources; the output does not automatically inherit their password protection.
Is this PDF tool completely free?
Yes. Processing and downloading results are completely free. Keep an original copy for future work.

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