Convert EPUB to BMP in C#

To convert EPUB to BMP in C#, open the EPUB file as a stream, create ImageSaveOptions with ImageFormat.Bmp, and call Converter.ConvertEPUB() with the stream, options, and output path.

BMP is a bitmap image format developed by Microsoft. It is less compact than PNG or JPG, but it can be useful in Windows-oriented workflows, legacy systems, imaging tools, and pipelines that require uncompressed or simple bitmap output. With Aspose.HTML for .NET, you can render EPUB content to BMP programmatically and control page setup, resolution, background color, and rendering quality.

Before running the examples, install and configure Aspose.HTML for .NET in your project. The complete C# example project is available in the Aspose.HTML for .NET GitHub repository.

Convert an EPUB File to BMP in C#

A typical file-based conversion uses a readable EPUB file stream, an ImageSaveOptions object with ImageFormat.Bmp, and Converter.ConvertEPUB(). The conversion writes a BMP image to the specified output path.

The workflow is:

Open the EPUB file with File.OpenRead() or another readable stream.
Create an ImageSaveOptions instance and set the output format to ImageFormat.Bmp. The default Format value is PNG, so the format must be set for BMP output.
Call Converter.ConvertEPUB(stream, options, savePath) to write the BMP file.

The following C# code converts an EPUB file to BMP.

 1// Convert EPUB to BMP using C#
 2
 3// Open an existing EPUB file for reading
 4using FileStream stream = File.OpenRead(DataDir + "input.epub");
 5
 6// Prepare a path to save the converted file 
 7string savePath = Path.Combine(OutputDir, "input-output.bmp");
 8
 9// Create an instance of the ImageSaveOptions class 
10ImageSaveOptions options = new ImageSaveOptions(ImageFormat.Bmp);
11
12// Call the ConvertEPUB() method to convert EPUB to BMP
13Converter.ConvertEPUB(stream, options, savePath);

Example-ConvertEpubToBmp.cs hosted with ❤ by GitHub

When to Use EPUB to BMP Conversion

Use BMP output when the target system expects bitmap files, when post-processing is handled by Windows imaging tools, or when compatibility with older image workflows matters more than small file size. BMP is usually not the best web delivery format; for web previews, EPUB to JPG or EPUB to PNG is often a better choice.

For BMP output, create ImageSaveOptions(ImageFormat.Bmp) explicitly because the default ImageSaveOptions.Format value is PNG. You can then tune page setup, background color, resolution, antialiasing, and text rendering in the options object.

Customize EPUB to BMP with ImageSaveOptions

Use ImageSaveOptions when the output BMP needs custom rendering settings. The options object is passed to ConvertEPUB() and controls how EPUB content is rendered to raster image output.

Option	Use it to control
`Css`	CSS processing behavior through `CssOptions`.
`Format`	The output image format. The default value is `PNG`; use `ImageFormat.Bmp` for BMP output.
`BackgroundColor`	The color used to fill the image background. The default value is transparent.
`PageSetup`	Page size, margins, and page layout settings.
`HorizontalResolution` and `VerticalResolution`	Output resolution values used by the rendering process. The default value is 300 dpi for each property.
`UseAntialiasing`	Image rendering quality. Antialiasing is enabled by default.
`Text`	Text rendering configuration through `TextOptions`.

The following example creates a BMP file with custom ImageSaveOptions.

 1// Convert EPUB to BMP in C# with custom settings
 2
 3// Open an existing EPUB file for reading
 4using FileStream stream = File.OpenRead(DataDir + "input.epub");
 5
 6// Prepare a path for converted file saving 
 7string savePath = Path.Combine(OutputDir, "input-options.bmp");
 8
 9// Initialize ImageSaveOptions 
10ImageSaveOptions options = new ImageSaveOptions(ImageFormat.Bmp)
11{
12    UseAntialiasing = true,
13    HorizontalResolution = 400,
14    VerticalResolution = 400,
15    BackgroundColor = System.Drawing.Color.AliceBlue
16};
17
18// Call the ConvertEPUB() method to convert EPUB to BMP
19Converter.ConvertEPUB(stream, options, savePath);

Example-ConvertEpubToBmpWithCustomSettings.cs hosted with ❤ by GitHub

In this example, ImageSaveOptions is passed to Converter.ConvertEPUB() together with the EPUB stream and output path. The sample configures background color, rendering resolution, and antialiasing for the generated BMP image.

Related Image Workflows

Related EPUB Conversion Guides

Convert EPUB to PDF – create PDF output from EPUB files.
Convert EPUB to JPG – render EPUB pages to JPEG images.
Convert EPUB to PNG – render EPUB pages to PNG images.
Convert EPUB to GIF – save EPUB content as GIF output.
Convert EPUB to TIFF – create TIFF output from EPUB content.

Other Platforms

Try Online EPUB to BMP Conversion

Use the online EPUB to BMP Converter for quick manual conversion. Use Aspose.HTML for .NET when EPUB to BMP conversion must run inside a C# application, service, or document pipeline.

FAQ

Can I convert EPUB to BMP for free?

You can evaluate Aspose.HTML for .NET before purchasing a license, but converted documents created in evaluation mode contain watermarks and are limited to four pages. For unrestricted testing, request a free 30-day Temporary License. For occasional manual conversions, use the free online EPUB to BMP Converter.

See Licensing Aspose.HTML for .NET for evaluation limitations and license setup.

Why can EPUB to BMP conversion produce large files?

BMP generally uses little or no compression, and an EPUB may render to large page images. Configure PageSetup, HorizontalResolution, and VerticalResolution so the bitmap does not contain more pixels than the destination workflow needs.

Convert EPUB to PNG Convert EPUB to GIF