把多张图片按顺序合成一个 PDF：证件扫描、作业照片、截图归档都适用。页面大小可选跟随图片、A4 或 Letter。全部本地生成。Combine multiple images (JPG/PNG/WebP) into a single PDF, with page size and margin options. Generated locally — nothing is uploaded.
图片顺序就是 PDF 页序，在列表里可删错重选。选「跟随图片」时每页按原图尺寸，打印请选 A4/Letter 并留边距。Image order becomes page order; remove and re-add to fix mistakes. 'Fit to image' sizes each page to the picture; choose A4/Letter with margins for printing.