叠加 PDF
把一份文档盖在另一份之上或之下。
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 draws every page of one document onto the corresponding page of another. Unlike merging, which puts documents next to each other, this puts them on top of each other.
Use it to apply a letterhead or a branded background to a plain document, to stamp a DRAFT or CONFIDENTIAL overlay that you designed elsewhere, or to place content onto a pre-designed form so it prints as one piece.
工作原理
- Drop both PDFs onto this page.
- Say which of the two is the stamp - by default it is the second one.
- Choose whether the stamp goes over the content or behind it. A letterhead usually goes behind; a DRAFT mark goes over.
- Set the fit and the opacity, then press Stamp.
- The download starts immediately.
Over and behind work differently under the surface, and the difference costs something worth knowing about. Drawing over adds to the existing page, so links, form fields and annotations on the base document survive. Drawing behind cannot be done that way - a PDF content stream can only be appended to - so the result is composed onto fresh pages instead, and the base document's annotations do not carry across. If your document has fillable fields you want to keep, stamp over rather than behind.
When the stamp has fewer pages than the base, repeat decides what happens. Repeat the last page suits a letterhead whose second page differs from its first. Cycle suits an alternating left-right design. Stop leaves later pages unstamped.
Fit controls scaling. Contain keeps the stamp's proportions and centres it, which is right for a logo. Stretch fills the page exactly, which is right for a full-page background designed at a different size. None places it at its original size.
Opacity below one is how you turn a solid design into a background that text stays readable over. For a plain text or diagonal watermark, Add watermark is a more direct tool than building a stamp file first.
这款工具做不到的事
- Stamping behind composes onto new pages, so links, form fields and annotations on the base document are not carried over. Stamping over keeps them.
常见问题
- 盖在之上和盖在之后有什么区别？
- 之上把叠层画在现有内容上方，并保留基础文档的链接、表单字段和批注。之后把叠层放在下面，这需要重建页面，因此那些批注会丢失。如果基础文档有可填写字段，就用之上。
- 我的叠层只有一页，文档有五十页，会怎样？
- 默认最后一张叠层页会在其余所有页面上重复，所以一页信头会落到每一页。你可以切换为循环使用叠层，或在叠层用完后停止。
- 两份文档页面尺寸不同，能对齐吗？
- 把适配设为适应页内时，叠层会被缩放到合适大小并居中，保持其比例。拉伸让它与页面完全一致，但如果宽高比不同就会使它变形。原始尺寸则以原始大小从中心放置。
- 我该用它来加水印吗？
- 只有当你已经把水印做成 PDF 时。对于纯文本或对角戳记，添加水印更直接——它会为你生成标记，而不用你先做一个文件。