How to Convert JPG to PDF .NET with C#

How Can I Convert a JPG File to a PDF Document in C#?

Converting a single JPG file to a PDF document requires just one method call with IronPDF's ImageToPdfConverter class. This image to PDF converter handles the entire conversion process automatically, preserving image quality while generating a properly formatted PDF file.

using IronPdf;
// Convert a single JPG image to PDF
PdfDocument PDF = ImageToPdfConverter.ImageToPdf("inputImage.jpg");
// Save the converted PDF to disk
pdf.SaveAs("output.pdf");

using IronPdf;
// Convert a single JPG image to PDF
PdfDocument PDF = ImageToPdfConverter.ImageToPdf("inputImage.jpg");
// Save the converted PDF to disk
pdf.SaveAs("output.pdf");

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How Do I Convert Multiple JPG Images Into One PDF File?

Combining multiple JPG files into a single PDF document is essential for creating photo albums, consolidating scanned pages, or archiving multiple images. The JPG to PDF converter accepts an array of file paths, merging all images into a single PDF with each image on its own page.

using IronPdf;
// Define multiple JPG images to convert
string[] jpgImages = { "page1.jpg", "page2.jpeg", "page3.jpg" };
// Convert all images into a single PDF document
PdfDocument PDF = ImageToPdfConverter.ImageToPdf(jpgImages);
// Save the combined PDF
pdf.SaveAs("combined-document.pdf");

using IronPdf;
// Define multiple JPG images to convert
string[] jpgImages = { "page1.jpg", "page2.jpeg", "page3.jpg" };
// Convert all images into a single PDF document
PdfDocument PDF = ImageToPdfConverter.ImageToPdf(jpgImages);
// Save the combined PDF
pdf.SaveAs("combined-document.pdf");

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This approach lets you convert multiple JPG images in the desired order; simply arrange the file paths in your array accordingly. The PDF converter works efficiently even with large batches of JPG pictures, processing many images in a few seconds on modern hardware.

For enterprise scenarios such as invoice processing or document digitization, you can enumerate image files in a directory and pass them directly to the converter. This enables automated workflows that convert JPG to PDF without manual intervention.

What Image Formats Does the JPG to PDF Converter Support?

IronPDF's image to PDF tool supports multiple image formats beyond JPG and JPEG. You can convert PNG, BMP, GIF, and TIFF files using the same straightforward API. This flexibility means your application can handle whatever image formats users provide.

using IronPdf;
// Convert PNG image to PDF
PdfDocument pngPdf = ImageToPdfConverter.ImageToPdf("graphic.png");
pngPdf.SaveAs("graphic.pdf");
// Convert BMP to PDF
PdfDocument bmpPdf = ImageToPdfConverter.ImageToPdf("scan.bmp");
bmpPdf.SaveAs("scan.pdf");

using IronPdf;
// Convert PNG image to PDF
PdfDocument pngPdf = ImageToPdfConverter.ImageToPdf("graphic.png");
pngPdf.SaveAs("graphic.pdf");
// Convert BMP to PDF
PdfDocument bmpPdf = ImageToPdfConverter.ImageToPdf("scan.bmp");
bmpPdf.SaveAs("scan.pdf");

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How Can I Preserve Image Quality in the Converted PDF?

Maintaining image quality during PDF conversion is critical for professional documents. IronPDF preserves the original resolution of your JPG images by default, ensuring no degradation occurs during the conversion process.

For scenarios where you need to balance file size against image quality, IronPDF provides PDF compression options that let you reduce the converted PDF size while controlling quality trade-offs. You can also rotate PDF pages if your source images have incorrect orientation.

The PDF converter works with high-resolution photos and scanned documents without imposing arbitrary limits, unlike free service alternatives that may compress or add a watermark to your output.

How Do I Customize Page Size and Orientation?

Controlling the output PDF format gives you flexibility for different use cases. IronPDF allows you to specify page dimensions and orientation when creating a new PDF document from images.

using IronPdf;
// Create renderer with custom settings
ChromePdfRenderer renderer = new ChromePdfRenderer();
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape;
// Convert image using HTML wrapper for custom sizing
string imageHtml = "<img src='wide-photo.jpg' style='width:100%'/>";
PdfDocument PDF = renderer.RenderHtmlAsPdf(imageHtml);
pdf.SaveAs("landscape-photo.pdf");

using IronPdf;
// Create renderer with custom settings
ChromePdfRenderer renderer = new ChromePdfRenderer();
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
renderer.RenderingOptions.PaperOrientation = IronPdf.Rendering.PdfPaperOrientation.Landscape;
// Convert image using HTML wrapper for custom sizing
string imageHtml = "<img src='wide-photo.jpg' style='width:100%'/>";
PdfDocument PDF = renderer.RenderHtmlAsPdf(imageHtml);
pdf.SaveAs("landscape-photo.pdf");

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Conclusion

IronPDF transforms JPG to PDF .NET development from a complex task into a simple, reliable operation. The library handles single images, multiple JPG files, and various image formats with consistent, high-quality results, without relying on external online services or other PDF tools.

Unlike PDF converter drag-and-drop websites, IronPDF gives you programmatic control for automated document workflows, batch processing, and enterprise integration. The converter processes images efficiently while maintaining quality, making it ideal for applications ranging from photo management to document archival systems.

Start your free trial to experience how IronPDF simplifies image to PDF conversion in your .NET projects, or purchase a license for production deployment.