HTML to PDF conversion issue using aspose.pdf.document and aspose.pdf.page

Aspose.PDF Product Family
1

We are using Aspose.pdf.document to convert html files to PDF. But converted PDF is not matching with HTML.
We have some external css files ,since we cant directly provide references of that file we are reading css files and adding their content in style tag.
After doing this way getting correct html but when we convert same html to PDF some design is getting break.

2

@smitan

When converting HTML to PDF using Aspose.PDF, discrepancies between the original HTML and the resulting PDF can occur, especially when external CSS files are involved. Here are some steps and considerations to help you achieve better results:

  1. Load External CSS Properly: Since you are reading CSS files and embedding their content within a <style> tag, ensure that all necessary styles are included. If the CSS is complex or relies on external resources (like images or fonts), it may not render correctly in the PDF.

  2. Use HtmlLoadOptions: Utilize the HtmlLoadOptions class to customize how the HTML is loaded. You can set options such as CustomLoaderOfExternalResources to handle external resources effectively. This allows you to define how resources like images or stylesheets are loaded during the conversion process.

    Here’s a basic example of how to set this up:

    using Aspose.Pdf;
using Aspose.Pdf.HtmlLoadOptions;

// Initialize HtmlLoadOptions
HtmlLoadOptions options = new HtmlLoadOptions();
options.CustomLoaderOfExternalResources = new LoadOptions.ResourceLoadingStrategy(MyResourceLoader);

// Load the HTML document
Document pdfDocument = new Document("path/to/your.html", options);
pdfDocument.Save("output.pdf");

    In the above code, MyResourceLoader would be a method you define to handle loading of external resources.

  3. Check for CSS Compatibility: Some CSS properties may not be fully supported in the PDF rendering engine. Review the CSS used in your HTML and simplify or modify it if necessary. Testing with minimal styles can help identify which styles are causing issues.

  4. Render to Single Page: If your content is being split across multiple pages unexpectedly, consider using the IsRenderToSinglePage property in HtmlLoadOptions. This can help keep your layout intact.

  5. Debugging: If the output still does not match your expectations, try converting simpler HTML documents to isolate the issue. This can help determine if the problem lies with specific CSS rules or HTML structures.

By following these guidelines, you should be able to improve the fidelity of your HTML to PDF conversions using Aspose.PDF. If you continue to experience issues, consider sharing specific examples of the HTML and CSS that are causing problems for further assistance.

Sources:
[1]: HTMLToPDF.cs
[2]: ConvertHTMLToPDFFormat.java