Watermark & page numbers
Stamp a diagonal watermark and/or page numbers — locally, without uploading.
How to add a watermark and page numbers to a PDF locally
- Drop a PDF above — it opens in your browser, never uploaded.
- Type the watermark text (e.g. CONFIDENTIAL or 机密), pick opacity and size, and tick page numbers if you want “n / total” at the bottom.
- Click “Stamp & download”. Every page gets the diagonal watermark and/or numbers.
FAQ
Does it support Chinese/CJK watermark text?
Yes — a CJK font is loaded on demand and embedded as a tiny subset, so “机密” adds only a few dozen KB to your file.
Can it remove an existing watermark?
No — this tool only adds stamps. Removing marks from documents you don’t own can be a legal problem, so we don’t offer it.
Is my document uploaded?
No. Stamping happens entirely in your browser; the site works offline after first load.
怎么在本地给 PDF 加水印和页码
- 把 PDF 拖进上面的框——文件在浏览器里打开，不上传。
- 输入水印文字（如 机密 或 CONFIDENTIAL），选择透明度和字号，需要页码就勾选「n / 总页数」。
- 点「添加并下载」，每一页都会带上斜排水印和/或页码。
常见问题
支持中文水印吗？
支持——中文字体按需加载并以子集方式嵌入，「机密」两个字只让文件增加几十 KB。
能去除已有的水印吗？
不能——本工具只做添加。去除他人文档上的标记可能涉及法律问题，所以我们不提供。
文档会被上传吗？
不会。盖章完全在你的浏览器里完成，首次加载后离线也能用。