How to Convert PDF to Image in .NET

BMP file format, also known as bitmap image file or device independent bitmap (DIB) file format, is a raster graphics image file format used to store bitmap digital images. This raster image file format is capable of storing 2D digital images of arbitrary width, height, and resolution, both monochrome and color, in various color depths, and optionally with data compression, alpha channels, and color profiles.

Before getting started to use our .NET software for PDF to BMP converting, please make sure you've already well prepared for the following aspects.

• Visual Studio 2005, 2008, 2010, 2012 or 2013 version
• .NET Framework 2.0, 3.0, 3.5, 4.0, or 4.5 version
• Any Microsoft Windows Operating System
• x86 or x64 platform
• ASP.NET web application
• .NET Windows Forms application
• Console application

Property: PDF Page Count

.NET PDF to Image SDK provides the property for PDF file page count. Users may use the code below to count PDF file page and decide which PDF page or how many PDF pages to be rendered and converted BMP image file(s). Certainly, you may directly choose to change the whole PDF document to BMP images.

public int PageCount;

Property: DPI (Dots per Inch)

If .NET developers want to improve the output bitmap's definition, DPI property customization is supported.

public double DPI;

Load PDF to .NET Project

Flexible file loading methods are supplied for .NET application, including loading from local PDF file and loading from stream (memory stream and file stream).

public bool LoadPDF(string fileName);
public bool LoadPDF(Stream stream);

Get to Know PDF Page Size

For better implementing PDF-to-BMP conversion in .NET project, original page size can be obtained. .NET developers can reference the original PDF page size before specifying the wanted BMP image size.

public int GetPageHeight(int pageIndex);
public int GetPageWidth(int pageIndex);

Get the Converted BMP Image

.NET developers can easily get a PDF document page and then change it to a BMP image. The method below is used to specify a page via index parameter. In addition, several defined pages can be turned into BMP image files simultaneously.

Public Bitmap ToImage(int pageIndex);

If you would like to resize the output .bmp image(s), please add the code below.

Public Bitmap ToImage(int pageIndex, int width, int height);