Scanned a double-sided document as two separate files — one PDF of front pages, one of backs? Alternate & Mix weaves them together automatically: page 1 from the first file, page 1 from the second, page 2, page 2, and so on, so you don't have to interleave pages by hand.
How to alternate & mix
- 1
Upload both files
Drag both PDFs — fronts first, then backs — onto the upload area.
- 2
Select Alternate & Mix
Choose the tool once both files have loaded.
- 3
Click Run
Pages are interleaved instantly, right in your browser.
- 4
Download your combined PDF
Fronts and backs now sit in the correct reading order.
Why use RealPDFTool for alternate & mix
Built for duplex scanning
Solves the exact problem a single-sided scanner creates when it captures fronts and backs as separate passes.
Your files never leave your browser
Interleaving runs locally — neither file is ever uploaded.
Frequently asked questions about alternate & mix
What is this tool actually for?
It's built for double-sided documents scanned on a scanner that only captures one side per pass — you end up with two separate PDFs (all fronts, then all backs) that need weaving into the correct reading order.
Does it work if the second file is in reverse order?
Many scanners feed the back pages in reverse order — look for the reverse-second-file option in the tool before interleaving.
Is there a page limit?
No hard limit — it runs entirely in your browser, so it's bounded only by your device's memory.
Are my files uploaded anywhere?
No — interleaving happens locally, so neither file is ever uploaded.