PDFRasterizer.NET 4.0 is now available. Supports .NET Core. Renders pixel-perfectly.
- How to downscale all images in a PDF
- How to generate and export certificates
- How to downscale all images in a PDF
- Add Stamp to PDF
- How to reduce PDF file size
- How do I create graphics with Icc based colors
- Highlight fields in PDF
- Add a note to PDF
- Resize PDF pages
- Verify a custom digital PDF signature
- Extract glyph boxes from PDF
- Use TrueType font collections
- Layout text with MultilineTextShape
- Merge PDF files in C# .NET
- How do I extract page destinations from bookmarks?
- Clip PDF page content in C#
- Fill PDF form
- Extract glyphs and sort by reading order
- Add bookmarks to PDF
- How to scale content of PDF
- Create rectangles with rounded corners
- Create text with decorations
- Create layers in PDF and draw on each layer
- TIFF to PDF C#
- Crop content on a PDF page
- How to embed files in a PDF document
- Remove graphics from PDF
- Change the color inside a PDF
- Import FDF into PDF
- Flatten PDF form
- Digitally sign a PDF form in C# or VB.NET
- Vector graphics in PDF
- Translate PDF page content
- Extract graphics from PDF
- Determine the content bounding box
- Search text in PDF
- Convert PDF to plain text
- Flatten Markup Annotation
- Add text field to PDF
- Extract embedded files from PDF
- Extract images from PDF
- Add a Diagonal Watermark to PDF in C#
- Fit image to PDF page
- Add simple html text to PDF
- Add multiline text to a PDF document
- Add single-line text to PDF
- Create a new digitally signed PDF document
- PDF Viewer Preferences
- Change page orientation PDF
- Split PDF pages in C# and VB.NET
- Append two or more existing PDF files
- Determine if a PDF only contains images
- Add footer to PDF
- Convert SVG to PDF
- Fill in a PDF form using MVC
- Add hyperlink to PDF
- Rotate a PDF page
- Change the formatting of a numeric field
- How to mirror PDF pages and other shapes
- Fill in a template PDF document
- How to add autosized text to PDF
- Create formfields in PDF documents
- Export FDF from PDF form
- Add a link with an internal destination to PDF
- Remove PDF security settings
- Add a link to PDF with an external destination
- How to sign and verify updates to a PDF document
- Embed TrueType font
- How to create a tiling for shapes in PDF
- EMF to PDF as vector image
- EMF to PDF as raster image
- Replace field with image
- Add a rubber stamp annotation with a custom icon
- Create a text annotation in PDF with rich text
- Read and write meta data from PDF
- Create a custom signature handler to sign and verify PDF documents
- Download and convert image to PDF
- Add barcodes to PDF
- Use multiple licenses
- Disable submit button after submitting
Add a Diagonal Watermark to PDF in C#
C# add watermark to pdf Code Sample
With PDFKit.NET 4.0 & PDFKit.NET 5.0 you can create and manipulate PDF documents. Split, append, stamp, encrypt, extract, fill and more.
This code sample shows how to add a diagonal watermark to an existing PDF in C#.
C# add watermark to pdf Code Sample
static void Main(string[] args)
{
using (FileStream sourceFile =
new FileStream("original.pdf", FileMode.Open, FileAccess.Read))
{
// open the document
Document pdf = new Document(sourceFile);
foreach (Page page in pdf.Pages)
{
// stamp each page
addWatermark(page);
}
// save the modified pdf
using (FileStream targetFile =
new FileStream("watermarked.pdf", FileMode.Create, FileAccess.Write))
{
pdf.Write(targetFile);
}
}
}
.NET add watermark to pdf Code Sample
Using sourceFile As New FileStream("..\..\input.pdf", FileMode.Open, FileAccess.Read)
' open the document
Dim pdf As New Document(sourceFile)
For Each page As Page In pdf.Pages
' stamp each page
addWatermark(page)
Next
' save the modified pdf
Using targetFile As New FileStream("..\..\output.pdf", FileMode.Create, FileAccess.Write)
pdf.Write(targetFile)
End Using
End Using
The following method adds the watermark to PDF in C#.
static void addWatermark(Page page)
{
// calculate the page diagonal
double diagonal = Math.Sqrt(page.Height * page.Height + page.Width * page.Width);
// format the text
TextShape watermark = new TextShape();
watermark.Text = "Diagonal watermark";
watermark.Font = Font.CourierBold;
watermark.Pen = new Pen(RgbColor.Red, 2);
watermark.Brush = null;
watermark.FontSize = 1; // recalculated below
// calculate font size so to fit the diagonal of the page - 0.8 is a fuzzy factor
watermark.FontSize *= 0.8 * (diagonal / watermark.MeasuredWidth);
// transform the text so that it runs diagonal across the page
TransformCollection transforms = new TransformCollection();
transforms.Add(new TranslateTransform(0, -0.5 * watermark.MeasuredHeight));
transforms.Add(new TranslateTransform((diagonal - watermark.MeasuredWidth) / 2, 0));
transforms.Add(new RotateTransform(-(180 / Math.PI) * Math.Atan2(page.Height, page.Width)));
watermark.Transform = transforms;
page.Overlay.Add(watermark);
}
Private Sub addWatermark(page As Page)
' calculate the page diagonal
Dim diagonal As Double = Math.Sqrt(page.Height * page.Height + page.Width * page.Width)
' format the text
Dim watermark As New TextShape()
watermark.Text = "Diagonal watermark"
watermark.Font = Font.CourierBold
watermark.Pen = New Pen(RgbColor.Red, 2)
watermark.Brush = Nothing
watermark.FontSize = 1
' recalculated below
' calculate font size so to fit the diagonal of the page - 0.8 is a fuzzy factor
watermark.FontSize *= 0.8 * (diagonal / watermark.MeasuredWidth)
' transform the text so that it runs diagonal across the page
Dim transforms As New TransformCollection()
transforms.Add(New TranslateTransform(0, -0.5 * watermark.MeasuredHeight))
transforms.Add(New TranslateTransform((diagonal - watermark.MeasuredWidth) / 2, 0))
transforms.Add(New RotateTransform(-(180 / Math.PI) * Math.Atan2(page.Height, page.Width)))
watermark.Transform = transforms
page.Overlay.Add(watermark)
End Sub
More C#PDF watermark code samples?
Check out other C# Watermark code samples:

Download PDFKit.NET 4.0
We will send you a download link
Why do we ask your email address?
We send tips that speed up your evaluation
We let you know about bug fixes
You can always unsubscribe with one click
We never share your address with a 3rd party
Thank you for your download
We have sent an email with a download link.