交替混合
交错两个文件并反转第二个——双面扫描的解决办法。
这款工具完全在你的浏览器中运行。文件从不上传，你可以在浏览器的网络标签中亲自验证这一点。 亲自验证：打开浏览器的网络标签观察。你会看到一个查询你是否还有剩余任务的小请求，只包含工具名称和一段哈希，绝不会包含文件。
这款工具的作用
This weaves two documents together one page at a time, reversing the second as it goes. It exists to solve one specific and very common problem, and it solves it in a single pass.
You have a double-sided stack of paper and a scanner that only scans one side. So you scan the stack once to get all the fronts, flip the whole stack over, and scan it again to get all the backs - but because you flipped the stack, the backs come out in reverse order. Front page one belongs with back page last. This tool puts them together correctly.
工作原理
- Scan the stack face-up to get the fronts, then flip the whole stack and scan again to get the backs.
- Drop both PDFs onto this page. The first file in the list is the fronts.
- Leave reverse the second file on - that is what corrects the flipped stack.
- Press Mix files.
- The download starts on its own. Check a few pages before throwing the originals away.
Reversing the second file is on by default because that is what the flipped-stack workflow needs. If your two files are already both in forward order - for instance you scanned odds and evens separately in the same direction - turn it off and you get a plain interleave instead.
The two files do not have to be the same length. If a page jammed and one file is short, the remaining pages of the longer file are appended in order rather than dropped, so nothing goes missing while you work out which sheet went astray.
Pages per turn handles booklet scans. Scanning folded sheets gives you two pages of content per scanned side, so setting the value to two takes two pages from each file in turn instead of one.
This tool interleaves at the page level, which means it cannot share resources between the two documents the way a straight merge can. A pair of scans with an identical letterhead will produce a slightly larger file than merging them would. Run Compress PDF afterwards if that matters.
这款工具做不到的事
- Because pages are interleaved one at a time, shared resources are stored more than once and the result can be larger than a plain merge.
常见问题
- 我为什么需要这个而不是合并？
- 合并是把一份文档接在另一份之后：先全部正面，再全部背面。双面扫描需要的是正面 1、背面 1、正面 2、背面 2——而且背面要倒序，因为翻转纸叠把它们弄反了。这正是这款工具所做的，而合并做不到。
- 我的两个文件页数不同，还能用吗？
- 能。只要两个文件都还有页面，就会一直交错，然后较长文件里剩下的内容会按顺序追加。任何内容都不会被丢弃，所以你能看出哪里出了问题。
- 我什么时候该关闭反转第二个文件？
- 当两个文件都已经是正序时——例如你的扫描仪按同一方向生成了单独的奇数页和偶数页文件，或者你在第二遍扫描前重新整理了纸叠而不是翻转它。
- 每轮页数是做什么用的？
- 扫描折叠的纸张时，每个扫描面会捕获两页内容。把每轮页数设为 2，会在切换前从每个文件各取两页，从而正确地重组这类扫描。