为 PDF 添加水印
在每一页上加盖类似“机密”或“草稿”的文字水印。
使用方法
上传您的 PDF，输入水印文字，选择位置（或铺满整页），选择可见程度，然后下载——每一页都会加上相同的水印，全程在您的浏览器中完成。
我可以控制水印的可见程度吗？
可以——可选择浅、中或深的不透明度，既能清晰可见，又不会影响页面可读性。
添加水印时会上传我的 PDF 吗？
不会——此操作完全在您的浏览器中通过 WebAssembly 完成。您的文件不会离开您的设备，也不会经过任何服务器。
Can I add a diagonal watermark?
Yes — the rotation option lets you angle the text, including the classic diagonal look used for DRAFT or CONFIDENTIAL stamps.
Will the watermark print if I print the PDF?
Yes — it's stamped directly into the page content, so it appears on screen and in any print or export.
Can I remove a watermark this tool added later?
Not automatically — once downloaded, the watermark is part of the page content. Keep a copy of your original file if you might need an unwatermarked version later.
Can I use a logo or image as the watermark instead of text?
No — this tool only stamps text. If you need a logo or picture on every page instead, that's not something it does.
Can I change the watermark's color or font?
No — every watermark comes out in the same bold gray font. You can control its size, opacity, rotation, and position, but not the color or typeface.
Can I watermark only some pages, not the whole document?
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