How to Rasterize a PDF to Images

Output Folder

If the form fields' values are intended to be visible in the output images, please flatten the PDF before converting it to an image or pass true to the Flatten parameter of the method. Forms will not be detectable after using the Flatten method.

Learn how to fill and edit PDF forms programmatically in the following article: "How to Fill and Edit PDF Forms."

Rasterize to High Quality Bitmap

For users who want to retain the original resolution of their images when converting to a Bitmap, please use ToBitmapHighQuality instead of ToBitmap. The ToBitmap method returns an image decoded from JPEG, while the ToBitmapHighQuality method returns an image decoded from the BMP format. The BMP format stores the raw data of each pixel, which results in a sharper image but also a very large file size. In contrast, JPEG uses a lossy compression algorithm, which significantly reduces file size at the cost of a slightly blurrier image. For most use cases, such as printing and viewing PDFs, the image quality from JPEG is sufficient.

:path=/static-assets/pdf/content-code-examples/how-to/rasterize-pdf-to-images-to-bitmap-high-quality.cs

using IronPdf;

PdfDocument pdf = PdfDocument.FromFile("url.pdf");

var image = pdf.ToBitmapHighQuality();
image[0].SaveAs("output.png");

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Specify Image Type

Another parameter provided by the method allows you to specify the file types for the output images. We support BMP, JPEG, PNG, GIF, TIFF, and SVG formats. Each type has its corresponding method that can be directly invoked from the PdfDocument object. Here are the available methods:

• ToBitmap: Rasterizes (renders) the PDF into individual AnyBitmap objects, with one Bitmap for each page.
• ToJpegImages: Renders the PDF pages as JPEG files and saves them to disk.
• ToPngImages: Renders the PDF pages as PNG (Portable Network Graphic) files and saves them to disk.
• ToTiffImages: Renders the PDF pages as single-page TIFF files and saves them to disk.
• ToMultiPageTiffImage: Renders the PDF pages as a single multi-page TIFF file and saves it to disk.
• SaveAsSvg: Converts the PDF document to an SVG format and saves it to the specified file path.
• ToSvgString: Converts a specific page of the PDF document to an SVG format and returns it as a string.

:path=/static-assets/pdf/content-code-examples/how-to/rasterize-pdf-to-images-image-type.cs

Specify DPI

When using the default DPI of 96, the output images may appear blurry. To improve clarity, it is important to specify a higher DPI value when rasterizing.

:path=/static-assets/pdf/content-code-examples/how-to/rasterize-pdf-to-images-dpi.cs

using IronPdf;

// Instantiate Renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Render PDF from web URL
PdfDocument pdf = renderer.RenderUrlAsPdf("https://en.wikipedia.org/wiki/Main_Page");

// Export images from PDF with DPI 150
pdf.RasterizeToImageFiles("wikipage_*.png", DPI: 150);

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Specify Pages Index

It is also possible to specify which pages of the PDF document you want to rasterize into image(s). In the example below, images of PDF document pages 1-3 will be generated.

:path=/static-assets/pdf/content-code-examples/how-to/rasterize-pdf-to-images-page-indexes.cs

using IronPdf;
using System.Linq;

// Instantiate Renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Render PDF from web URL
PdfDocument pdf = renderer.RenderUrlAsPdf("https://en.wikipedia.org/wiki/Main_Page");

// Export images from PDF page 1_3
pdf.RasterizeToImageFiles("wikipage_*.png", Enumerable.Range(1, 3));

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Specify Image Dimensions

When converting PDF documents to images, you have the flexibility to customize the height and width of the output images. The specified height and width values represent the maximum dimensions, while ensuring that the aspect ratio of the original document is preserved. For instance, in the case of a portrait PDF document, the specified height value will be exact, while the width value may be adjusted to maintain the correct aspect ratio.

:path=/static-assets/pdf/content-code-examples/how-to/rasterize-pdf-to-images-image-dimensions.cs

using IronPdf;

// Instantiate Renderer
ChromePdfRenderer renderer = new ChromePdfRenderer();

// Render PDF from web URL
PdfDocument pdf = renderer.RenderUrlAsPdf("https://en.wikipedia.org/wiki/Main_Page");

// Export images from PDF
pdf.RasterizeToImageFiles("wikipage_*.png", 500, 500);

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Specifications for Output Images

The dimensions for the output images are specified using the width by height format, denoted as width x height.

Portrait

Landscape