Rasterizing PDFs to Images with MemoryStream
Curtis Chau
Updated: April 22, 2026
How do I convert PDF pages to images using MemoryStream, without touching the file system?
IronPDF offers loading PDF documents from MemoryStream. (How-Tos | API Reference)
Use the PdfDocument.ToBitmap() method to export PDF pages as images. This will return an array of IronSoftware.Drawing.AnyBitmap objects, which can be used for further processing.
using IronPdf;
using System.IO;
// Example rendering PDF documents to Images or Thumbnails
using var pdf = PdfDocument.FromFile("Example.pdf");
// Convert each page of the PDF document to a bitmap image
IronSoftware.Drawing.AnyBitmap[] pageImages = pdf.ToBitmap();
foreach (var bitmap in pageImages)
{
// Use MemoryStream to handle the image data in memory
using (MemoryStream memoryStream = new MemoryStream())
{
// Export the image to MemoryStream as a PNG format
bitmap.ExportStream(memoryStream, IronSoftware.Drawing.AnyBitmap.ImageFormat.Png);
// MemoryStream can now be used for further processing without touching the file system
// Example: Send it over a network, save to a database, etc.
}
// Dispose of the bitmap once processing is complete to free resources
bitmap.Dispose();
}Imports IronPdf
Imports System.IO
' Example rendering PDF documents to Images or Thumbnails
Using pdf = PdfDocument.FromFile("Example.pdf")
' Convert each page of the PDF document to a bitmap image
Dim pageImages As IronSoftware.Drawing.AnyBitmap() = pdf.ToBitmap()
For Each bitmap In pageImages
' Use MemoryStream to handle the image data in memory
Using memoryStream As New MemoryStream()
' Export the image to MemoryStream as a PNG format
bitmap.ExportStream(memoryStream, IronSoftware.Drawing.AnyBitmap.ImageFormat.Png)
' MemoryStream can now be used for further processing without touching the file system
' Example: Send it over a network, save to a database, etc.
End Using
' Dispose of the bitmap once processing is complete to free resources
bitmap.Dispose()
Next
End UsingImports IronPdf
Imports System.IO
' Example rendering PDF documents to Images or Thumbnails
Using pdf = PdfDocument.FromFile("Example.pdf")
' Convert each page of the PDF document to a bitmap image
Dim pageImages As IronSoftware.Drawing.AnyBitmap() = pdf.ToBitmap()
For Each bitmap In pageImages
' Use MemoryStream to handle the image data in memory
Using memoryStream As New MemoryStream()
' Export the image to MemoryStream as a PNG format
bitmap.ExportStream(memoryStream, IronSoftware.Drawing.AnyBitmap.ImageFormat.Png)
' MemoryStream can now be used for further processing without touching the file system
' Example: Send it over a network, save to a database, etc.
End Using
' Dispose of the bitmap once processing is complete to free resources
bitmap.Dispose()
Next
End UsingHere is a helpful Stack Overflow article for more details on saving a bitmap into a MemoryStream.
Technical Writer
Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.
