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交替合并两个 PDF
交替合并两个文件中的页面，例如扫描得到的正面和背面。
使用方法
上传您的两个 PDF 并下载结果——页面会按 A1、B1、A2、B2……的顺序交替排列。
典型的使用场景是什么？
单面扫描仪实现双面扫描效果：先把所有正面扫描成一个文件，再把所有背面扫描成另一个文件，这个工具会把它们按正确的正反顺序交替合并。
如果两个文件的页数不同怎么办？
较长文件中多出的页面会在较短文件的交替页用完后，依次添加到末尾。
Which file should I upload first, fronts or backs?
Upload the fronts as the first file and the backs as the second — the tool interleaves them in that order, A1 then B1, A2 then B2, and so on.
Do the two PDFs need the same number of pages?
No — if one has more pages, its extra pages are simply added to the end after the interleaving runs out.
Is this the same as duplex printing?
It solves the opposite problem — reassembling scans made on a single-sided (simplex) scanner back into the correct front-back reading order.
My scanner fed the back sides in reverse order — what do I do?
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Can I mix more than two files, or use a pattern other than one-for-one?
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My back-side scans have extra blank pages — will that mess up the order?
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