反转页序
把文档从后往前翻转。
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 turns the document back to front: the last page becomes the first and so on. Pages are copied rather than re-rendered, so it costs nothing in quality.
Almost always to fix a scanner. Document feeders that stack their output face-up produce a PDF that reads from the last page backwards, and the fix is a single pass through this tool. It is also useful for documents in right-to-left binding order that were assembled left to right.
工作原理
- Drop the PDF onto this page.
- Leave the page range empty to reverse the whole document.
- To flip only part of it, give a range - those pages are reversed among themselves and everything else stays where it is.
- Press Reverse.
- The download starts on its own.
Reversing a range does something more careful than it might sound. The selected pages swap positions among themselves, and every page outside the selection stays exactly where it was. Reversing pages 3 to 6 of a ten-page document leaves pages 1, 2, 7, 8, 9 and 10 untouched. A naive implementation that lifted the range out and put it back would shuffle the surrounding pages, which is a subtle way to lose a document's structure.
If your scan is both reversed and double-sided, this tool is only half the fix. Scanning a double-sided stack on a single-sided feeder produces two files - fronts in order, backs reversed - and what you need is Alternate and mix, which interleaves them and reverses the second automatically.
Bookmarks are re-pointed at the pages' new positions, so a table of contents keeps working after the flip.
Everything happens in your browser, so a 500-page scan is reversed without a byte being uploaded.
常见问题
- 我的扫描仪把页面弄成倒序了，这是解决办法吗？
- 如果你是单面扫描，输出从最后一页读起，那么是的——这款工具跑一遍就能纠正。如果你是分两遍扫描双面纸叠，你会得到两个文件，那时你需要的是交替混合，它会把它们交错并为你反转第二个。
- 我能只反转文档的一部分吗？
- 可以。给出一个页面范围，就只有那些页面在它们之间反转。范围之外的一切都保持原位。
- 书签会怎样？
- 它们会随页面移动到新位置，所以翻转之后目录仍然有效。
- 反转会改变质量或文件大小吗？
- 不会。页面按原样复制，所以文本仍是文本，扫描件保持分辨率，文件大小基本不变。