Alternate & Mix

Processed locally — file never leaves your browser

Interleave pages from two PDFs — perfect for double-sided scan combining.

First PDF (odd pages)

Drop PDF A

Front / odd sides

PDF files supported

Second PDF (even pages)

Drop PDF B

Back / even sides

PDF files supported

How it works

1
Upload two PDFs
Drop your first PDF in the left box (odd pages / front) and the second in the right box (even pages / back).
2
Choose mode
'Interleave' alternates pages: A1, B1, A2, B2… 'Reverse second' is for double-sided scanners that return back pages in reverse order.
3
Download
Click Mix PDFs to get the combined document instantly.

Your file never leaves your device

This tool runs entirely in your browser using pdf-lib. Nothing is uploaded. Safe for Aadhaar, PAN, bank statements, and confidential documents.

Frequently asked questions

What is this tool for?

Flatbed scanners without automatic duplex often scan all front pages as one PDF and all back pages as another. This tool interleaves them back into reading order.

Are my files uploaded?

No. Everything runs in your browser using pdf-lib.