Interleave Two PDFs
Merge two PDFs by alternating their pages. Runs entirely in your browser, so your data never leaves your device.
Drop files here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Interleave Two PDFs
- 1. Add both PDFs. Drop the two documents into the workspace in the order you want them alternated, since the first file added supplies the first page.
- 2. Let the tool alternate the pages. The tool merges the two documents by taking one page from the first, then one from the second, repeating until both are fully interleaved.
- 3. Preview the merged order. Check the thumbnail grid of the combined result to confirm the pages alternate correctly, especially if the two files have different page counts.
- 4. Download the interleaved PDF. Generate and save the file. It contains both documents' pages woven together in alternating order as a single document.
When to use Interleave Two PDFs
Interleave Two PDFs merges two documents by alternating their pages one for one, rather than simply appending one after the other. It exists specifically for reassembling documents that were scanned or exported in separate front and back streams.
- Reassembling a duplex scan from two single-sided passes. A scanner without automatic duplex support produced two separate PDFs, one for all the front sides and one for all the back sides. Interleaving them recreates the original page order.
- Combining an original and translation page by page. A source document and its translated version exist as two separate PDFs, and a reader wants each original page followed immediately by its translation.
- Merging a document with its annotation overlay. A base document and a separate PDF of reviewer comments need to alternate page by page so each comment page sits right after the content it discusses.
About the Interleave Two PDFs tool
Interleave Two PDFs is a free online tool that works entirely inside your web browser. Merge two PDFs by alternating their pages. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 92 PDF utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
There is nothing to configure. Provide the input and the result appears on its own. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Interleave Two PDFs free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
Which files does Interleave Two PDFs accept?
It accepts PDF documents. There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.