将两个 PDF 合并起来，听起来像是把一个文件接在另一个文件后面。但在底层逻辑上，它更像是利用这两个文件已有的页面来构建一个新文档。这些页面可以具有不同的尺寸、方向、字体、图像、链接和内部结构；它们不需要被扁平化为图片，也不需要为了匹配而调整尺寸。 这就是为什么我将“页面”视为移动的对象，而不是你在屏幕上看到的截图。你可以导入多个 PDF，按照想要的顺序排列页面，旋转或删除不需要的内容，然后将结果保存为一个新的 PDF。A4 页面依然是 A4，横向页面依然是横向，且源文件保持不变。 整个操作都在浏览器中完成。你的 PDF 在你的设备上打开并在此合并，当你保存时才会创建新文件。关于 PDF 合并具体如何运作的更多信息，请参阅 Guides。
Putting two PDFs together sounds like putting one file after another. Underneath, it is closer to building a new document from the pages both files already contain. Those pages can have different sizes, orientations, fonts, images, links, and internal structures; they do not need to be flattened into pictures or resized to match each other. That is why I treat the page as the thing being moved, not the screenshot you see on screen. You can bring several PDFs in, arrange their pages in the order you want, rotate or remove what you do not need, and then save the result as one new PDF. An A4 page stays A4, a landscape page stays landscape, and the source files are left alone. The whole operation happens in the browser. Your PDFs are opened on your device, combined there, and the new file is created when you save it. There is more on how PDF merging actually works in Guides.
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