If you need a fast, reliable C# library for converting PDF files to HTML, this article provides a complete solution using Aspose.PDF for .NET. You’ll learn how to perform basic PDF‑to‑HTML conversion, embed resources, save images to a custom folder, and generate multipage HTML output—all with clear code samples.
- C# PDF to HTML Conversion Library
- Convert PDF to HTML using C#
- Convert PDF to HTML with Embedded Resources in C#
- Save Images to Specific Folder in PDF to HTML Conversion
- Convert PDF to Multipage HTML in C#
C# Library to Convert PDF to HTML
For PDF to HTML conversion we use Aspose.PDF for .NET, a powerful API that creates, processes, and converts PDF documents. The library supports free conversion with a temporary license.
You can download Aspose.PDF for .NET or add it to your project via the NuGet Package Manager.
PM> Install-Package Aspose.PDF
Convert PDF to HTML in C#
Converting a PDF to HTML is straightforward. Follow these two steps:
- Load the PDF document with the Document class.
- Save the document as HTML using Document.Save().
// Open the source PDF document
Document pdfDocument = new Document("PDFToHTML.pdf");
// Save the file into HTML format
pdfDocument.Save("output_out.html", SaveFormat.Html);
Aspose.PDF handles all PDF internals, so you don’t need any external PDF readers.
C# PDF to HTML Conversion with Embedded Resources
To embed all PDF resources (images, CSS, fonts) directly into the HTML output, use the HtmlSaveOptions.PartsEmbeddingMode enumerator.
// Load source PDF file
Document doc = new Document("input.pdf");
// Instantiate HTML Save options object
HtmlSaveOptions newOptions = new HtmlSaveOptions();
// Embed all resources inside the HTML
newOptions.PartsEmbeddingMode = HtmlSaveOptions.PartsEmbeddingModes.EmbedAllIntoHtml;
// Optional IE optimization
newOptions.LettersPositioningMethod = HtmlSaveOptions.LettersPositioningMethods.UseEmUnitsAndCompensationOfRoundingErrorsInCss;
newOptions.RasterImagesSavingMode = HtmlSaveOptions.RasterImagesSavingModes.AsEmbeddedPartsOfPngPageBackground;
newOptions.FontSavingMode = HtmlSaveOptions.FontSavingModes.SaveInAllFormats;
// Output file path
string outHtmlFile = "SingleHTML_out.html";
doc.Save(outHtmlFile, newOptions);
C# Save PDF as HTML with Image Folder
When a PDF contains images, you can choose to store those images in a separate folder rather than embedding them. Aspose.PDF lets you define a custom folder for extracted images.
// Load source PDF file
Document doc = new Document("input.pdf");
// Create HtmlSaveOptions with image folder feature
HtmlSaveOptions newOptions = new HtmlSaveOptions();
// Specify the folder for extracted images
newOptions.SpecialFolderForAllImages = "MyFolder";
// Output file path
string outHtmlFile = "HTML.html";
doc.Save(outHtmlFile, newOptions);
Export PDF to Multipage HTML in C#
If you prefer a paginated HTML output, enable the SplitIntoPages option. This creates a separate HTML file for each PDF page.
// Open the source PDF document
Document pdfDocument = new Document("PDFToHTML.pdf");
// Instantiate HTML SaveOptions object
HtmlSaveOptions htmlOptions = new HtmlSaveOptions();
// Split the output into multiple pages
htmlOptions.SplitIntoPages = true;
// Save the document
pdfDocument.Save(@"MultiPageHTML_out.html", htmlOptions);
Setting the SplitIntoPages flag to true automatically generates a series of HTML pages that mirror the original PDF layout.
Free C# PDF to HTML Converter
Obtain a free temporary license to convert PDF to HTML without usage limits.
Explore C# PDF to HTML Library
Visit the documentation page, PDF to HTML, for advanced features and additional conversion options.
Download your free copy of Aspose.PDF for .NET and start building PDF‑to‑HTML solutions today. For questions, post in the Aspose.PDF forum; our team is ready to help.
Conclusion
This guide demonstrated multiple ways to convert PDF to HTML programmatically with C#. You saw basic conversion, resource embedding, image folder handling, and multipage HTML generation. Use the provided code snippets to integrate fast PDF‑to‑HTML conversion into your .NET applications.