How to Split Side-by-Side (Landscape) PDF Pages

When scanning physical books, catalogs, or magazines, scan hardware often captures two pages at once, producing a wide landscape page. Reading these files on tablets or smartphones is inconvenient due to small text and constant zooming. This guide demonstrates how to split wide pages into single portrait pages using Adobe Acrobat Pro, followed by an automated browser-based alternative.

Steps to Split Side-by-Side Pages in Adobe Acrobat Pro

To successfully divide wide, horizontal pages into separate portrait layouts using Adobe Acrobat Pro, you will need to copy the file and use the crop toolset on each part:

1. In your operating system's file explorer, duplicate your source PDF. Rename one copy to "Left_Half.pdf" and the other to "Right_Half.pdf".
2. Open "Left_Half.pdf" in Acrobat Pro and go to Tools > Edit PDF.
3. Select the Crop Pages tool from the top toolbar.
4. Click and drag a box selection overlay covering exactly the left side of the page layout (from the left boundary to the center fold).
5. Double-click inside your drawn rectangle to open the **Set Page Boxes** control. Under the Page Range panel, select **All**, then click **OK**. The right half of every page will be cropped. Save and close.
6. Open "Right_Half.pdf" in Acrobat and select **Crop Pages**. Drag a selection bounding box around the right half of the page layout (from the center line to the right boundary). Apply to **All** pages and save the file.
7. Open Acrobat's **Combine Files** feature. To reconstruct the book structure, you must drag and arrange the pages in an alternating sequence (Left Page 1, Right Page 1, Left Page 2, Right Page 2...) and then export the finalized single PDF.

Alternative Option: Use UniPagePDF to Automatically Split Spreads

The manual workflow can be slow for extensive books, and it risks cropping cover pages or images that are already in portrait layout. UniPagePDF provides a smart splitter that automates this entire process:

1. Upload your book scan PDF into the UniPagePDF split tool.
2. The algorithm automatically scans the document structure, **splitting only landscape pages** while leaving standard portrait pages (like single-page covers) completely untouched.
3. Adjust the center division slider on-screen if the book fold is slightly off-center.
4. Click export to let the tool instantly split, sequence, and generate your ready-to-read portrait PDF.