All Converter Pro
在线 PDF 水印
在线免费为 PDF 的每一页添加 "机密" 或 "草稿" 之类的文字水印。可控制文字、透明度和位置。无需注册,无水印广告。
关于此 PDF 水印 工具
Watermark PDF stamps your own text - such as CONFIDENTIAL, DRAFT, PAID, or a company name - across every page of a document. The watermark is applied with adjustable transparency so the underlying content stays readable, and it becomes part of the page content, so it shows in every PDF viewer and on every printout. Watermarking is the standard way to mark document status (draft vs. final), assert ownership before sharing a proposal, or discourage redistribution of paid content. Because the mark is embedded on each page rather than added as a removable annotation, casual readers cannot simply delete it in a PDF viewer.
如何使用 PDF 水印
- 打开工具并添加您的文件、文字或数值。
- 检查可用选项,例如页面范围、输出格式、质量、密码或语言。
- 开始处理,并在完成前保持浏览器窗口打开。
- 下载结果,如有需要可继续使用相关工具。
实用提示
- 对于扫描的 PDF,支持 OCR 的工具会尽可能自动运行文字识别。
- 对于大文件,在通过邮件分享或上传到门户网站之前,请使用压缩工具。
- 为获得最佳效果,请上传扩展名正确的干净文件,避免使用损坏的文档。
Watermarks vs. password protection
A watermark is visible deterrence: it marks status or ownership on the page itself but does not stop anyone from opening or copying the file.
Password protection (Protect PDF) is access control: it encrypts the file so only people with the password can open it.
For sensitive documents shared externally, using both is common - a CONFIDENTIAL watermark for visibility plus a password for access control.
常见问题
What text can I use as a watermark?
Any short text: CONFIDENTIAL, DRAFT, APPROVED, PAID, a company name, or a recipient name. Short, uppercase words in a diagonal layout are the most legible convention.
Will the watermark hide my document content?
No. The watermark is drawn with transparency so the page content underneath remains readable. You control how strong the mark appears.
Does the watermark appear when the PDF is printed?
Yes. The watermark is embedded into the page content itself, so it appears in every viewer and on paper.
Can a watermark be removed later?
Not casually - it is flattened into the page rather than added as a separate annotation. Determined editing tools can attempt removal, so treat watermarks as a deterrent, not as security. For real protection, combine with Protect PDF.
Can I watermark only some pages?
The watermark is applied to all pages of the uploaded file. To watermark only a section, split those pages out first with Split PDF, watermark them, then merge back.
watermarking 免费吗?
Yes. The tool is free with no account required, and it adds only your watermark - never its own branding.