Ctrl K

★ My Tools

📘 Step-by-step guide

How to Use Interleave PDF – Complete Guide

Combine two PDFs page by page. Perfect when you scan the front sides and the back sides of a stack separately.

⏱ 2 min read🛠 PDF Tools🔒 Free · Works on your device
🚀 Open Interleave PDF

⚡ Quick answer

Join front sides and back sides into one PDF in the right order.

Open Interleave PDF, follow the steps below, and you are done in a minute or two. No sign-in is needed.

📋 How to use Interleave PDF – step by step

  1. Choose the first PDF (for example the front sides)
  2. Choose the second PDF (for example the back sides)
  3. Tick "reverse order" if you scanned the back sides after turning the stack over
  4. Check the page order shown in blue and orange
  5. Click "Combine and download"

💡 Why use this tool?

Many scanners can scan only one side. Then you scan the front sides first, turn the stack over, and scan the back sides. The back sides come out in reverse order, and the two files must be mixed page by page.

This tool does the mixing in one click and shows the exact page order before you download.

✨ Features at a glance

  • Mix two PDFs page by page (page 1 of the first, page 1 of the second, and so on)
  • Reverse the first or the second PDF
  • Take 1 to 5 pages from each file before switching
  • Choose which PDF comes first
  • Shows the full page order before saving
  • Warns if the page counts are different
  • Swap the two files
  • Works in your browser, nothing is uploaded

🎯 Helpful tips

  • Keep a copy of your original file. Work on the copy so you can always go back.
  • Check the result by opening it once before you send it to someone.
  • Large or scanned files may take a little longer. Keep the tab open until the download starts.

❓ Frequently asked questions

What is the back side order?

When you turn the stack over, the last page is on top. So the back sides are scanned in reverse. Tick "second PDF is in reverse order" and it is fixed.

What if my two PDFs have different page counts?

The tool tells you. The extra pages of the longer file are added at the end. Check that you did not miss a page while scanning.

Does the quality change?

No. The original pages are copied, so text, images and size stay the same.

Is my file uploaded?

No. Everything happens in your browser.

Is it free?

Yes, completely free.

Ready to try it?

Interleave PDF is free and your files stay on your device.

🚀 Open Interleave PDF