PDF加水印

新

Add text watermark to all pages

PDF工具

如何使用 PDF加水印

  1. 1上传PDF
  2. 2输入水印文字
  3. 3调整透明度和字体大小
  4. 4点击应用水印并下载

关于 PDF加水印

PDF加水印在每一页上印上对角线文字水印。自定义文字、透明度和字体大小。水印以45°角呈现在每页中央。

PDF加水印的主要功能

  • 快速准确的Watermark Pdf处理
  • 无需安装——在浏览器中工作
  • 免费无限制
  • 隐私保护——数据永不离开浏览器
  • 移动和桌面兼容
  • 即时结果带实时预览
  • Works on any PDF regardless of content or page count
  • No additional watermarks or branding added to output

支持的格式

输入格式

PDF (any version)

输出格式

PDF (with embedded text watermark)

Only text watermarks are supported. The watermark is permanently embedded at 45° centered on each page and cannot be easily removed.

示例

Add CONFIDENTIAL stamp to a contract

Watermark a contract PDF with "CONFIDENTIAL" before sending to external parties.

输入

Contract PDF + "CONFIDENTIAL" text, 30% opacity

输出

PDF with diagonal CONFIDENTIAL watermark on every page

Mark a document under review as DRAFT

Add a semi-transparent DRAFT watermark to a document being reviewed before final approval.

输入

Document PDF + "DRAFT" text, 20% opacity

输出

PDF with subtle DRAFT watermark visible on all pages

常见使用场景

  • 专业Watermark Pdf任务
  • 快速日常计算
  • 教育目的和学习
  • 商业和工作场所生产力
  • 个人项目和爱好
  • Adding DO NOT COPY warnings to sensitive documents

故障排除

意外结果

解决方案

检查输入格式并确保所有必填字段正确填写。

工具不工作

解决方案

清除浏览器缓存并刷新。确保启用 JavaScript。

Watermark does not appear on some pages

解决方案

All pages receive the watermark. If some pages look different, they may have a white overlay element. Verify by opening the PDF in a different viewer.

常见问题

我可以自定义水印吗？

可以——输入任意文字并调整透明度和大小。

水印是永久的吗？

是的。一旦添加，水印就嵌入PDF中，不易删除。

What opacity level should I use?

For a subtle background mark that does not obstruct reading, use 15–30% opacity. For a clearly visible stamp, use 40–60%. Above 70% the watermark may obscure text and images on the page.

Can I add an image or logo as a watermark?

Currently only text watermarks are supported. Image and logo watermarks may be added in a future update. As an alternative, you can use a PDF editor for image-based watermarking.

Does the watermark appear on every page?

Yes. The same watermark text is applied to every page of the PDF without exception. There is no option to skip specific pages.

Can I change the watermark position or angle?

The watermark is always placed diagonally at 45° in the center of each page. Custom positioning, angle adjustment, and multi-position placement are not currently available.

Will adding a watermark significantly increase file size?

No. The watermark adds only a small amount of text drawing instructions to each page. For a typical PDF, the file size increase is a few kilobytes at most — negligible compared to the original.

Can I watermark a password-protected PDF?

No. The PDF must be unlocked before modifications can be applied. Use the Unlock PDF tool to remove the password, then apply the watermark to the resulting unprotected file.