Order of pages in the new PDF (blue = first PDF, orange = second PDF):
How to Interleave Two PDFs
Join front sides and back sides into one PDF in the right order.
- Choose the first PDF (for example the front sides)
- Choose the second PDF (for example the back sides)
- Tick "reverse order" if you scanned the back sides after turning the stack over
- Check the page order shown in blue and orange
- Click "Combine and download"
Everything happens inside your browser, so your document is never uploaded.
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
- 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
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.
About This Tool
Made for offices, students and anyone who scans documents with a single-sided scanner.
It works in your browser and does not store your files.