How to convert PDF with wide pages to flipbook?

I'm trying to convert my PDF file to page flip books with 1stFlip HTML5 Flipbook Maker. The pages are a mix of ordinary single A4 pages, some double A4 width pages. How to import the PDF correctly?

When we import PDF file with wide pages, it is shown as below:

import pdf with wide pages

Apparently this is not what we want. To display wide page PDF correctly, remember to check the Detect wide pages option before importing PDF.

detect pdf wide pages

Then the wide page is split to two pages automatically.

flipbook with wide pages

Download the free trial of 1stFlip Flash/HTML5 Flip Book Creator and make a Flash or HTML5 flipbook from PDF with wide pages.