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Alternate Mix PDF Online Free — PrivaTools

TL;DR: Upload two PDFs and download a copy that interleaves their pages (1A, 1B, 2A, 2B…) — useful for un-imposing two-sided scans.

Alternate mix PDF pages online — interleave pages from two or more PDFs for duplex scanning workflows. Combine front-side and back-side scans into the correct page order.

Like the rest of the 179-tool PrivaTools suite, Alternate Mix PDF is MIT-licensed and self-hostable. The public demo deletes your file as soon as the response leaves the server — verifiable in the open-source codebase on GitHub.

How to Alternate Mix PDF with PrivaTools

  1. Upload two PDFs — Select two PDFs to interleave. They don't need the same page count.
  2. Choose mode — Alternate: page 1A, 1B, 2A, 2B… Reverse-alternate: same, but the second PDF is reversed first (useful for double-sided scans where the back side scans bottom-to-top).
  3. Download the mixed PDF — Click Mix. The output is a single PDF with pages interleaved from both inputs.

Frequently Asked Questions

When would I use this?

The classic case is double-sided scanning on a single-sided scanner: scan the odd pages, flip the stack, scan the even pages in reverse, then alternate-mix them with reverse-alternate.

What if the PDFs have different page counts?

PrivaTools alternates pages until one source is exhausted, then appends the remaining pages from the longer source at the end.

Does this preserve bookmarks?

No. Bookmarks from the originals are dropped because they would point to incorrect pages after interleaving.

Last reviewed 2026-05-01 by the PrivaTools maintainers. Source code on (MIT-licensed, self-hostable).

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