Will the result be in alphabetical filename order?

Yes — the files are sorted by filename before interleaving, so the A in "A1,B1,…" is whichever filename sorts first.

v1 supports two files at a time. Interleave the first pair, then interleave the result with the third file.

Will the result be in alphabetical filename order?

Yes — the files are sorted by filename before interleaving, so the A in "A1,B1,…" is whichever filename sorts first.

v1 supports two files at a time. Interleave the first pair, then interleave the result with the third file.

Interleave Two PDFs (Alternate Pages)

Take two PDFs and weave their pages together — A1, B1, A2, B2, … Common when you scanned a double-sided document as two separate single-sided PDFs.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your files (min 2)

Drop PDF files here

or click to browse (max 2)

Need at least 2 files (have 0).

How does the Interleave Two PDFs (Alternate Pages) work?

Weave the pages of two PDFs together: A1, B1, A2, B2, A3, B3, … The most common use case is reassembling a duplex (front + back) scan when an old auto-feed scanner could only scan one side at a time, producing two PDFs: one with all the FRONT pages and one with all the BACK pages. Some scanners spit the back pages out reverse-ordered (last back page first); turn on the "Reverse the second file" toggle in that case so the interleave matches the original document order.

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.