Rotate Images and PDFs in C# .NET

With PSPDFKit GdPicture.NET Library, it’s possible to rotate PDF pages and images in the following ways:

PDF
- Rotate a PDF page — Rotate a selected page by 90, -90, 180, -180, 270, or -270 (or any multiple of 90) degrees.
- Rotate a PDF page at any angle — Rotate a selected page by any angle.
- Rotate all PDF pages — Rotate all PDF pages by 90, -90, 180, -180, 270, or -270 (or any multiple of 90) degrees.
Images
- Rotate and flip an image — Rotate an image by 90, -90, 180, -180, 270, or -270 (or any multiple of 90) degrees and flip it around its axis.
- Rotate an image at any angle – Rotate an image using any angle.

Rotating a PDF Page

To rotate a page of a PDF clockwise by a multiple of 90 degrees, follow these steps:

Select the page with the SelectPage method.
Rotate the page with the RotatePage method. Use multiples of 90 degrees, such as 90, 180, and 270. To rotate a page counterclockwise, use negative values.

The example below rotates the specified page of a PDF file clockwise by 90 degrees:

using GdPicturePDF gdpicturePDF = new GdPicturePDF();
gdpicturePDF.LoadFromFile(@"C:\temp\source.pdf", false);
gdpicturePDF.SelectPage(2);
// Rotate the selected page 90 degrees clockwise.
gdpicturePDF.RotatePage(90);
gdpicturePDF.SaveToFile(@"C:\temp\output.pdf");

Using gdpicturePDF As GdPicturePDF = New GdPicturePDF()
    gdpicturePDF.LoadFromFile("C:\temp\source.pdf", False)
    gdpicturePDF.SelectPage(2)
    ' Rotate the selected page 90 degrees clockwise.
    gdpicturePDF.RotatePage(90)
    gdpicturePDF.SaveToFile("C:\temp\output.pdf")
End Using

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Rotating a PDF Page at Any Angle

To rotate a PDF page counterclockwise by any angle, use the RotatePageEx method. To rotate a page counterclockwise, use negative values. Before rotating a page, select the page with the SelectPage method.

To rotate the specified page of a PDF file by -23 degrees, use the following example:

using GdPicturePDF gdpicturePDF = new GdPicturePDF();
    gdpicturePDF.LoadFromFile(@"C:\temp\source.pdf", false);
    gdpicturePDF.SelectPage(2);
    // Rotate the selected page counterclockwise by 23 degrees.
    gdpicturePDF.RotatePageEx(-23);
    gdpicturePDF.SaveToFile(@"C:\temp\output.pdf");

Using gdpicturePDF As GdPicturePDF = New GdPicturePDF()
    gdpicturePDF.LoadFromFile("C:\temp\source.pdf", False)
    gdpicturePDF.SelectPage(2)
    ' Rotate the selected page counterclockwise by 23 degrees.
    gdpicturePDF.RotatePageEx(-23)
    gdpicturePDF.SaveToFile("C:\temp\output.pdf")
End Using

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Rotating All PDF Pages

To rotate all PDF pages clockwise at the same angle at once, use the RotatePages method. This method accepts multiples of 90 degrees, such as 90, 180, and 270. To rotate a page counterclockwise, use negative values.

To rotate all pages of a PDF file by -270 degrees, use the following example:

using GdPicturePDF gdpicturePDF = new GdPicturePDF();
gdpicturePDF.LoadFromFile(@"C:\temp\source.pdf", false);
// Rotate the selected page counterclockwise by 270 degrees.
gdpicturePDF.RotatePages(-270);
gdpicturePDF.SaveToFile(@"C:\temp\output.pdf");

Using gdpicturePDF As GdPicturePDF = New GdPicturePDF()
    gdpicturePDF.LoadFromFile("C:\temp\source.pdf", False)
    ' Rotate the selected page counterclockwise by 270 degrees.
    gdpicturePDF.RotatePages(-270)
    gdpicturePDF.SaveToFile("C:\temp\output.pdf")
End Using

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Rotating and Flipping an Image

To both rotate and flip an image by multiples of 90 degrees, such as 90, 180, and 270, use the Rotate method. To rotate counterclockwise, use negative values. This method requires the RotateFlipType enumeration, which specifies the angle by which the image is rotated and how it’s flipped. For more information, refer to the RotateFlipType enumeration.

The RotateFlipType enumeration is provided in the .NET COM interop edition only. Applications linking other editions must use the System.Drawing.RotateFlipType enumeration.

To rotate an image 270 degrees and flip it on its Y axis, use the following example:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Rotate the image by 270 degrees clockwise and flip it on its Y axis.
gdpictureImaging.Rotate(imageID, RotateFlipType.Rotate270FlipY);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg", 75);
gdpictureImaging.ReleaseGdPictureImage(imageID);

Using gdpictureImaging As GdPictureImaging = New GdPictureImaging()
    Dim imageID As Integer = gdpictureImaging.CreateGdPictureImageFromFile("C:\temp\source.jpg")
    ' Rotate the image by 270 degrees clockwise and flip it on its Y axis.
    gdpictureImaging.Rotate(imageID, RotateFlipType.Rotate270FlipY)
    gdpictureImaging.SaveAsJPEG(imageID, "C:\temp\output.jpg", 75)
    gdpictureImaging.ReleaseGdPictureImage(imageID)
End Using

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Rotating an Image at Any Angle

To rotate an image clockwise by any angle, use the RotateAngle method. To rotate a page counterclockwise, use negative values.

To rotate an image by -23 degrees, use the following example:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
int imageID = gdpictureImaging.CreateGdPictureImageFromFile(@"C:\temp\source.jpg");
// Rotate the image counterclockwise by 23 degrees.
gdpictureImaging.RotateAngle(imageID, -23);
gdpictureImaging.SaveAsJPEG(imageID, @"C:\temp\output.jpg", 75);
gdpictureImaging.ReleaseGdPictureImage(imageID);

Using gdpictureImaging As GdPictureImaging = New GdPictureImaging()
    Dim imageID As Integer = gdpictureImaging.CreateGdPictureImageFromFile("C:\temp\source.jpg")
    ' Rotate the image counterclockwise by 23 degrees.
    gdpictureImaging.RotateAngle(imageID, -23)
    gdpictureImaging.SaveAsJPEG(imageID, "C:\temp\output.jpg", 75)
    gdpictureImaging.ReleaseGdPictureImage(imageID)
End Using

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