Interleave Two PDFs
Merge the two halves of a duplex scan into one correctly ordered PDF. Upload the odd/front pages as PDF A and the even/back pages as PDF B - they interleave page by page into a single document, all processed privately in your browser.
Privacy: Both PDFs are processed only in your browser — nothing is uploaded, no server sees them.
How to use
- Select the PDF that holds the front / odd pages (1, 3, 5 ...) as PDF A.
- Select the PDF that holds the back / even pages (2, 4, 6 ...) as PDF B.
- Keep reverse B checked if your scanner scanned the back side in reverse order (this is the usual duplex behaviour).
- Click Interleave & Download. Pages are merged as A1, B1, A2, B2 ... and the result downloads automatically.
Tips
- If your scanner saved the back side in reverse order, keep reverse B checked - most duplex scanners do this.
- Verify PDF A really holds the odd pages (1, 3, 5) before merging; mixing them up garbles the order.
- For long documents, merge a few pages first as a test before committing the whole file.
- Everything runs in your browser - safe for sensitive scanned documents.