Alternate Merge PDF - Interleave Pages Free
Merge two or more PDFs page-by-page into an alternating, interleaved document. Custom order and preserved bookmarks - free and private.
Upload PDF Files
About This Tool
Alternate Merge combines PDFs by interleaving their pages - page 1 of A, page 1 of B, page 2 of A, page 2 of B and so on. Ideal for merging double-sided scans, comparing versions, or pairing documents.
Keep bookmarks and set a custom interleave order to produce exactly the arrangement your workflow needs.
Everything runs locally in your browser, keeping your files private and the tool free.
How to Use
Upload the PDFs
Drag and drop two or more PDFs to interleave.
Choose the pattern
Set whether pages alternate one-by-one or in custom blocks.
Review the order
Check the preview of the merged sequence.
Merge and download
Download your interleaved PDF.
Use Cases
Double-Sided Scans
Recombine separately scanned front and back pages.
Document Comparison
Interleave two versions for side-by-side review.
Paired Materials
Merge a report with its addendum page by page.
Frequently Asked Questions
How does interleaving work?
Pages are combined in turn - A1, B1, A2, B2 - so the documents alternate page by page.
Can I customize the pattern?
Yes - set custom interleave blocks for more complex arrangements.
Are bookmarks preserved?
Yes - bookmarks are kept where they exist in the source files.