本文包括一些最好的免费在线工具和软件，用于在Windows 11/10计算机中为 PDF 添加水印。^{( add watermark to PDF)}通过在PDF^(PDF)文件中添加水印，您可以使它们成为受版权保护的材料。您还可以使用其中一些工具自定义水印，例如更改文本颜色、文本样式、水印透明度等。虽然某些工具的免费版本/计划有一些限制，但其他工具是完全免费的，没有任何限制。

^(Add)使用适用于 PC 的免费在线工具或软件为PDF添加水印

我们介绍了 2 个免费在线工具和 4 个免费软件，可在Windows 11/10PDF添加水印。这些都是：

1. 赛达
2. PDF24 工具
3. 批量 PDF 水印
4. jPDF 调整
5. Star PDF Watermark Ultimate
6. Hexonic PDF 拆分和合并

让我们一一检查所有这些工具。

1] 塞达

Sejda是一个免费的在线工具，可以为PDF文件添加水印。它的免费版本可让您上传最多200 页^{(200 pages)}或50 MB大小的PDF文件。^(PDF)此外，您每小时最多可以执行 3 个任务。虽然免费版有这些限制，但它仍然很好用。

Sejda还为想要离线工作的用户提供了桌面版本。此工具的桌面版本可用于Windows计算机的安装程序和便携式版本。

要使用此免费工具，您必须访问其官方网站sejda.com。之后，单击上传 PDF 文件^{(Upload PDF files)}按钮并从您的计算机中选择PDF 。上传的PDF文件将在 2 小时后自动删除。如果需要，您还可以从Dropbox、Google Drive、One Drive等上传PDF文件。

您可以使用此工具向PDF文件添加两种类型的水印：

1. 文字水印
2. 图片水印

上传PDF文件后，左侧显示水印预览，右侧显示自定义工具。如果要将水印放置在PDF页面的中心，请选择“居中^(Centered)”选项，否则请选择“自定义^(Custom)”选项。您还可以在将图像水印上传到工具后更改其尺寸。

对于文本水印，免费版本提供三种字体样式，即Helvetica、Courier和Times New Roman。您还可以更改文本大小和颜色。要更改文本颜色，您必须在相应位置输入颜色代码。有许多不错的免费颜色选择器工具^{(free color picker tools)}可用于识别颜色代码。

该工具还有两种类型的滑块，即不透明度^(Opacity)和旋转^(Rotation)。调整^(Adjust)这些滑块以分别改变水印的透明度和旋转水印。

默认情况下，它会将水印放置在上传的PDF文件的所有页面上。但是，如果您愿意，您可以将水印添加到某些特定页面。

完成后，单击水印 PDF^{(Watermark PDF)}按钮。处理您的任务需要一些时间。处理完成后，在您的计算机上下载输出PDF文件或将其上传到您的Dropbox或 One Drive帐户。

2] PDF24工具

PDF24 Tools也是一个在线工具，在其免费计划中没有任何限制。^{(no limitations)}此免费工具可在tools.pdf24.org 获得^{(tools.pdf24.org)}。您可以从桌面上传PDF文件，也可以从Google Drive和Dropbox导入您的^(Dropbox)PDF文件。

要从您的计算机上传PDF文件，请单击选择文件^{(Choose files)}按钮并选择PDF文件。您也可以通过拖放方式上传PDF文件。^(PDF)

此工具可让您批量添加水印PDF文件。但是您上传的所有PDF文件都会添加相同的水印。如果这不是问题，那么只需上传多个PDF文件并将水印一起应用于所有这些文件。

它允许您仅添加文本水印，但存在一些有用的选项可将文本水印应用于PDF。这些都是：

1. 您可以更改水印的位置
2. 您可以更改字体大小
3. 字体^(Font)样式也可以更改。提供三种字体样式，即Helvetica、Times New Roman和Courier
4. 将水印^(Vary)的透明度从 0.0（完全透明）更改为 1.0（完全不透明）
5. 改变旋转角度
6. 设置^(Set)水印的水平和垂直间距。

因此，使用可用选项使水印在PDF文档的页面上看起来不错。完成后，单击添加水印^{(Add watermark)}选项。处理结果需要一些时间。之后，您可以预览输出，也可以将其下载到 PC。处理完输出后，您还可以使用其他工具，例如：

• 预览输出 PDF 文件
• 通过电子邮件发送水印 PDF
• 通过传真发送 PDF
• 将PDF 上传^{(Upload PDF)}到Dropbox或Google Drive
• 压缩 PDF
• 编辑 PDF
• 密码保护 PDF 文件
• 拆分带水印的 PDF 文件
• 合并带水印的 PDF 文件。

存在相当不错的功能，使其成为此列表中最好的工具之一。

3]批量PDF水印

Batch PDF Watermark是适用于^{(Batch PDF Watermark)}Windows 11/10的免费软件。顾名思义，它可以让您一次向多个PDF文件添加水印。^(PDF)如果要在PDF文件中添加相同的水印，最好添加多个PDF文件。您可以使用此软件为PDF添加文本水印和图像水印。

您可以从softpedia.com获得此工具。启动此软件时，您将看到两个选项卡，一个用于文本水印，另一个用于图像水印。根据要添加到PDF文件的水印类型选择选项卡。

要添加水印，首先，您必须选择PDF文件。单击^(Click)左下角的添加文件按钮。^{(Add files)}或者，您可以使用添加文件夹^{(Add Folder)}按钮添加特定文件夹中的PDF文件。^(PDF)

让我们看看添加文本水印的步骤：

1. 选择文本水印^{(Text Watermark)}选项卡
2. 在文本水印^{(Text Watermark)}选项卡下方提供的字段中键入自定义文本。
3. 选择^(Select)任何可用的字体样式
4. 更改文本颜色
5. 调整水印的文字大小
6. 选择文本水印对齐方式。为此，单击布局^(Layout)部分中的向上和向下箭头键，然后根据您的选择选择文本布局
7. 在“图层^(Layer)”部分中选择“叠加^(Overlay)”以将水印置于PDF文件中的页面上方
8. 更改文本水印的透明度。

现在，让我们看一下添加图像水印的步骤：

1. 单击图像水印^{(Image Watermark)}选项卡
2. 单击^(Click)向下箭头图标并选择浏览图像^{(Browse images)}选项以从您的计算机添加图像以应用为水印。默认情况下，它具有三个预添加的图像水印可供选择，即Confidential、Top Secret和Urgent。如果您想使用自己的图片作为水印，则需要使用浏览^(Browse)图片选项上传
3. 在布局^(Layout)部分中，选择要放置图像水印的位置
4. 在“图层^(Layer)”部分中选择“叠加^(Overlay)”以将水印置于PDF文件中的页面上方
5. 根据您的要求更改水印的不透明度。

完成后，单击“开始处理^{(Start Processing)}”按钮，然后获取带水印的PDF文件。

4] jPDF调整

j PDF Tweak是另一种为PDF添加水印的软件。它是一个JAR文件，因此需要Java框架才能使用此工具。从sourceforge.net获取此工具，然后打开或运行此工具的 JAR 文件^{(run JAR file)}以启动它。

要为您的PDF文件添加水印，请执行以下步骤：

1. 单击输入^(Input)选项卡
2. 单击文件名^(Filename)旁边的选择按钮^(Select)
3. 从您的计算机中选择PDF文件以添加它
4. 单击输出^(Output)选项卡
5. 单击文件名^(Filename)旁边的浏览按钮^(Browse)
6. 为输出文件命名并选择其输出位置
7. 单击水印^(Watermark)选项卡
8. 选中添加透明文本水印^{(Add transparent text watermark)}旁边的复选框
9. 在文本^(Text)字段中输入自定义文本
10. 设置字体大小
11. 设置文本水印的不透明度级别
12. 如果要向PDF文件添加自定义颜色的水印，请单击颜色^(Color)旁边的复选框。

完成后，单击右下角的Run按钮开始处理，并获取输出。

5]星PDF水印终极版

Star PDF Watermark Ultimate提供免费和付费版本。它的免费版本允许您仅将文本水印添加到PDF文件。尽管有许多可用于文本水印的自定义选项，但您将无法在其免费版本中访问它们。

让我们看看您可以在其免费计划中使用文本水印的哪些功能：

1. 您可以在软件中添加多个文本水印模板。要添加新模板，请单击左下角的加^(Plus)号图标
2. 更改水印的位置
3. 设置^(Set)其水平和垂直偏移值
4. 更改字体样式
5. 更改字体颜色。

您的所有水印模板都将在左侧的水印模板部分中提供。^{(Watermark Template)}

要使用此软件，请从star-watermark.com下载。

打开软件界面，点击添加文件^{(Add File)}按钮添加PDF。之后，选择水印模板，然后单击处理^(Processing)按钮。您还可以预览输出的PDF文件。

它将带水印的PDF保存在输入^(PDF)PDF文件所在的同一文件夹中。

6] Hexonic PDF拆分和合并

Hexonic PDF Split and Merge软件实际上可用于拆分和合并PDF文件。但是，您也可以使用它为PDF文件添加图像水印。该软件完全免费供个人使用。

从hexonic-software.com^{(hexonic-software.com)}获取此软件。启动软件后，单击添加文件^{(Add files)}按钮以插入PDF文件。您还可以插入多个PDF文件以将水印添加到所有这些文件中。但是这个功能的缺点是它在添加水印后合并了所有的PDF文件。^(PDF)因此^(Hence)，仅当您必须合并PDF文件并为其添加相同的水印时才使用此功能。

添加 PDF 文件后，选择其界面上可用的将图像插入为水印^{(Insert image as watermark)}选项，然后使用选择文件^{(Choose file)}按钮添加图像。它不允许您更改水印的位置、角度和透明度。

一切完成后，您应该在处理之前预览PDF文件，然后生成输出PDF。

提示^(TIP)：看看iLovePDF、LightPDF和PDFCandy。

如何免费在PDF上添加水印？

正如您在此列表中看到的，我们介绍了一些不错的工具，可让您免费在PDF上添加水印。^(PDF)虽然有些具有高级功能，可让您向PDF添加文本和图像水印，但其他一些则有一些限制。因此，您可以检查哪个工具更适合您并使用该工具为PDF文件添加水印。

Window 10 是否^{(Does Window 10)}附带PDF编辑软件？

Windows 10没有任何内置的PDF编辑软件。如果您想在Windows 10计算机上编辑^{(Windows 10)}PDF，可以下载一些不错的免费PDF 编辑软件^{(PDF editing software)}。除此之外，您还可以在Microsoft Store^{(Microsoft Store)}中搜索PDF编辑应用程序并使用它。

希望能帮助到你。

Add watermark to PDF using free online tools or software for Windows PC

This article includes some best free online tools and softwаre to add watermark to PDF in Windows 11/10 computer. By adding a watermark to your PDF files, you can make them a copyrighted material. You can also customize the watermark, like change the text color, text style, watermark transparency, etc., using some of these tools. While some tools have some limitations in their free versions/plans, other tools are completely free with no limitations.

Add watermark to PDF using free online tools or software for PC

We have covered 2 free online tools and 4 free software to add watermark to PDF in Windows 11/10. These are:

1. Sejda
2. PDF24 Tools
3. Batch PDF Watermark
4. jPDF Tweak
5. Star PDF Watermark Ultimate
6. Hexonic PDF Split and Merge

Let’s check all these tools one by one.

1] Sejda

Sejda is a free online tool to add a watermark to PDF files. Its free version lets you upload a PDF file with up to 200 pages or 50 MB in size. Also, you can perform up to 3 tasks per hour. Though the free version has these limitations, it is still good to use.

Sejda also comes with a desktop version for users who want to work offline. The desktop version of this tool is available in both installer and portable versions for Windows computers.

To use this free tool, you have to visit its official website, sejda.com. After that, click on the Upload PDF files button and select the PDF from your computer. The uploaded PDF file will automatically be deleted after 2 hours. If you want, you can also upload a PDF file from Dropbox, Google Drive, One Drive, etc.

You can add two types of watermarks to the PDF files using this tool:

1. Text watermark
2. Image watermark

After uploading the PDF file, it shows the preview of the watermark on the left section and customization tools on the right section. If you want to place the watermark in the center of the PDF pages, select the Centered option, otherwise select the Custom one. You can also change the dimensions of the image watermark after uploading it to the tool.

For a text watermark, three types of font styles are available in the free version, namely, Helvetica, Courier, and Times New Roman. You can also change the text size and color. To change the text color, you have to enter the color code in its respective place. There exist many good free color picker tools that you can use to identify the color code.

This tool also has two types of sliders, namely, Opacity and Rotation. Adjust these sliders in order to vary the transparency of the watermark and rotate the watermark respectively.

By default, it places the watermark on all the pages of the uploaded PDF file. But if you want, you can add the watermark to some specific pages.

When you are done, click on the Watermark PDF button. It will take some time to process your task. After the processing gets completed, download the output PDF file on your computer or upload it to your Dropbox or One Drive account.

2] PDF24 Tools

PDF24 Tools is also an online tool that comes with no limitations in its free plan. This free tool is available at tools.pdf24.org. You can upload a PDF file from the desktop or also import your PDF document from Google Drive and Dropbox.

To upload a PDF file from your computer, click on the Choose files button and select the PDF file. You can also upload the PDF file via the drag n drop method.

This tool lets you batch watermark PDF files. But the same watermark will be added to all the PDF files you upload. If that is not an issue, then simply upload multiple PDF files and apply the watermark to all those files together.

It lets you add only the text watermark, but some useful options are present to apply the text watermark to PDF. These are:

1. You can change the position of the watermark
2. You can change the font size
3. Font style can also be changed. Three font styles are available, namely, Helvetica, Times New Roman, and Courier
4. Vary the transparency of the watermark from 0.0 (completely transparent) to 1.0 (completely opaque)
5. Change the angle of rotation
6. Set horizontal and vertical spacing of the watermark.

So, play with available options to make the watermark look good on the pages of your PDF document. When you are done, click on Add watermark option. It will take some time to process the result. After that, you can preview the output, and also download it to PC. Once the output is processed, you can also use other tools such as:

• Preview the output PDF file
• Email the watermark PDF
• Send PDF via Fax
• Upload PDF to Dropbox or Google Drive
• Compress PDF
• Edit PDF
• Password protect PDF file
• Split the watermarked PDF file
• Merge the watermarked PDF files.

Pretty good features are present which makes it one of the best tools on this list.

3] Batch PDF Watermark

Batch PDF Watermark is free software for Windows 11/10. As its name indicates, it lets you add watermark to multiple PDF files at once. If you want to add the same watermark to PDF files, then it is good to add multiple PDF files. You can add text watermark as well as image watermark to PDF(s) using this software.

You can get this tool from softpedia.com. When you will launch this software, you will see two tabs, one for the text watermark, and the other for the image watermark. Select the tab according to the type of watermark you want to add to your PDF files.

To add a watermark, first, you have to select the PDF file(s). Click on the Add files button on the bottom left side. Or else, you can use Add Folder button to add PDF files present in a particular folder.

Let’s see the steps to add text watermark:

1. Select the Text Watermark tab
2. Type a custom text in the field provided just below the Text Watermark tab.
3. Select any of the available font styles
4. Change the text color
5. Adjust the text size for the watermark
6. Select the text watermark alignment. For this, click on the up and down arrow keys in the Layout section and select the text layout as per your choice
7. Select Overlay in the Layer section to bring the watermark above the pages in the PDF file
8. Change the transparency of the text watermark.

Now, let’s have a look at the steps to add an image watermark:

1. Click on the Image Watermark tab
2. Click on the down arrow icon and select the Browse images option to add an image from your computer to apply as a watermark. By default, it has three pre-added image watermarks to select from, namely, Confidential, Top Secret, and Urgent. If you want to use your own image as a watermark, then you need to upload it using the Browse images option
3. In the Layout section, select where you want to place the image watermark
4. Select Overlay in the Layer section to bring the watermark above the pages in the PDF file
5. Change the opacity of the watermark as per your requirement.

When you are done, click on the Start Processing button, and get the watermarked PDF file(s).

4] jPDF Tweak

jPDF Tweak is another software to add a watermark to PDF. It is a JAR file, so the Java framework is needed to use this tool. Grab this tool from sourceforge.net and then open or run JAR file of this tool to launch it.

To add a watermark to your PDF files, follow these steps:

1. Click on the Input tab
2. Click on the Select button next to the Filename
3. Select the PDF file from your computer to add it
4. Click on the Output tab
5. Click on the Browse button next to the Filename
6. Give a name to the output file and select its output location
7. Click on the Watermark tab
8. Select the checkbox adjacent to Add transparent text watermark
9. Enter the custom text in the Text field
10. Set font size
11. Set opacity level of text watermark
12. Click on the checkbox next to Color if you want to add a custom-colored watermark to your PDF file.

When you are done, click on the Run button on the bottom right side to start the processing, and get the output.

5] Star PDF Watermark Ultimate

Star PDF Watermark Ultimate is available in both free and paid versions. Its free version lets you add only the text watermark to PDF files. Though there are a lot of customization options available for the text watermark, you won’t be able to access them in its free version.

Let’s see what features of text watermark you can use in its free plan:

1. You can add multiple text watermark templates to the software. To add a new template, click on the Plus icon on the bottom left side
2. Change the location of the watermark
3. Set its horizontal and vertical offset values
4. Change the font style
5. Change the font color.

All your watermark templates will be available in the Watermark Template section on the left side.

To use this software, download it from star-watermark.com.

Open the software interface and click on the Add File button to add a PDF. After that, select the watermark template, and then click on the Processing button. You can also preview the output PDF file.

It saves the watermarked PDF in the same folder where the input PDF file is present.

6] Hexonic PDF Split and Merge

Hexonic PDF Split and Merge software is actually available for splitting and merging PDF files. But, you can also use it to add image watermarks to the PDF files. The software is completely free for personal use.

Get this software from hexonic-software.com. After launching the software, click on the Add files button to insert a PDF file. You can also insert multiple PDF files to add a watermark to all those files together. But the downside of this feature is it merges all the PDF files after adding the watermark. Hence, use this feature only if you have to merge the PDF files, and add the same watermark to them.

When the PDF file is added, select Insert image as watermark option available on its interface, and add an image using Choose file button. It does not let you change the position, angle, and transparency of the watermark.

When everything is done, you should preview the PDF file before processing it, and then generate the output PDF.

TIP: Take a look at iLovePDF, LightPDF and PDFCandy.

How do I put a watermark on a PDF for free?

As you can see in this list, we have covered some good tools that let you put a watermark on a PDF for free. While some have advanced features and let you add text as well as image watermark to PDF, others have some limitations. So, you can check which tool would be more suitable for you and use that tool to watermark PDF files.

Does Window 10 come with PDF editing software?

Windows 10 does not have any built-in PDF editing software. If you want to edit a PDF on Windows 10 computer, you can download some good and free PDF editing software. Apart from that, you can also search for a PDF editing app in Microsoft Store, and use it.

Hope it helps.

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