Choose only the pages you need
Do not automatically stitch every page. Covers, blank pages and appendices can make the result unnecessarily long. Select exact pages or ranges, then reorder them before export.
For example, a 20-page PDF may only need pages 2-6 and 11. A good converter should let you express that directly and preview the selected pages.
Use vertical layout for normal scrolling
For documents, receipts, reports and tutorials, vertical stitching is usually the most natural layout. Horizontal strips are more useful for comparisons, storyboards and side-by-side page sequences.
Watch the final pixel dimensions
A long image can become extremely tall at 300 DPI. The default preserves one full-resolution image, using progressive PNG encoding for very long output. Splitting and reduced-resolution output are optional.
Trim margins before stitching
PDF pages often include generous white margins. Trimming those margins before stitching can make the final image substantially shorter and easier to read, while a small padding value keeps sections from feeling cramped.