添加水印
免费·无需注册·文件永不离开你的设备
How to watermark a PDF in 3 steps
Mark documents as DRAFT, CONFIDENTIAL, or your own name — visible enough to matter, subtle enough not to obscure.
Upload the PDF
Drop the document in the box above. It stays on your device throughout.
Design the watermark
Type your text, set opacity and rotation, pick a position or tile it across the page.
Download the marked copy
Click Add watermark. Every page carries your stamp, and the file downloads instantly.
Why watermark PDFs with AmiPDF
Professional stamping, CJK included — where most free tools break.
隐私优先
处理完全在你的浏览器内完成。不上传、不存储、不外传——绝不。
无需注册，无水印
无账号、无邮箱、无限制。输出文件与输入完全一致。
Full CJK support
Chinese, Japanese, and Korean watermark text renders perfectly — a common failure point in free tools, solved by design here.
任何设备可用
Windows、Mac、Linux、Android、iOS 上体验一致——无需安装。
When to watermark PDF pages
Review copies marked DRAFT before they circulate, contracts stamped CONFIDENTIAL, portfolios signed with the owner's name, training materials labeled INTERNAL. A watermark states status at a glance and discourages casual reuse.
Watermarking happens locally — private documents stay private.
Add PDF watermarks on any platform
AmiPDF 在你的浏览器中运行——无需安装、无需配置、无需更新。
Windows
Chrome, Edge, Firefox
macOS
Safari, Chrome
Linux
Any modern browser
iOS
Safari on iPhone, iPad
Android
Chrome, Samsung Internet
Frequently asked questions
Can I watermark with Chinese, Japanese, or Korean text?
Yes — full CJK support is a headline feature. Characters render correctly, including full-width punctuation.
How do I keep the watermark from hiding the content?
Lower the opacity slider until the text is present but unobtrusive. 20-30% works for most documents.
Can I place different text on different pages?
The watermark applies uniformly to the whole document. For per-page text, split the PDF first, watermark each part, then merge.
Does a watermark prevent copying?
A visible watermark deters, it doesn't prevent. For actual restrictions (copying, printing), use Protect PDF to set document permissions.
Can I add an image logo as watermark?
This tool stamps text watermarks. Image watermarking is on the roadmap.
Is the watermarked file uploaded anywhere?
No. The watermark is rendered and stamped locally in your browser.
相关 PDF 工具
继续——处理 PDF 所需的其他工具，全部免费、全部本地运行。