The C# PDF Library

HTML to PDF

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

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

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

using IronPdf;

// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;

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

// Create a PDF from a HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");

// Export to a file or Stream
pdf.SaveAs("output.pdf");

// Advanced Example with HTML Assets
// Load external html assets: Images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");

PM >Install-Package IronPdf

Install-Package IronPdf

DEVELOPER UPDATES

Streamline E-Invoicing with IronPDF's Latest Update: PDF/A-3 Compliance and ZUGFeRD Support

Curtis Chau

Updated: August 1, 2026

IronPDF is excited to announce its latest update: support for PDF/A-3 compliance, a key feature for archiving PDF 1.7 documents with embedded files. This new capability enables seamless integration of file types like PDF, PNG, and ZUGFeRD XML, making it easier to meet modern e-invoicing standards across Europe and beyond.

What is ZUGFeRD?

ZUGFeRD (pronounced "tsook-ferd") is a hybrid e-invoicing format developed in Germany that combines the visual representation of a PDF with structured XML data for automated processing.

This format is widely adopted across the EU, where compliance with legal and enterprise invoicing mandates is increasingly required. Over time, ZUGFeRD has expanded internationally, evolving into the French equivalent, Factur-X, further solidifying its role as a global standard for business communication.

Why Do ZUGFeRD and PDF/A-3 Compliance Matter?

The PDF/A-3 format allows embedding additional file types, such as ZUGFeRD XML invoices, creating hybrid documents that are both human-readable and machine-readable. This makes it an essential tool for:

Archiving Invoices: Securely preserve invoice records while adhering to legal regulations.
Automated Processing: Enable systems to extract structured invoice data directly from embedded XML files.
Global Compliance: Meet invoicing mandates across EU nations that require PDF/A-3 with embedded ZUGFeRD XML invoices.

How Does It Work?

In a ZUGFeRD-compliant PDF/A-3 document, the embedded XML file (e.g., factur-x.xml) resides within the document dictionary's AF array, ensuring it references the entire PDF. This creates a seamless link between the visual PDF representation and the structured XML data. While the XML file provides data for automated workflows, it may not replicate every detail in the visual PDF, maintaining a balance between human readability and machine processability.

Key Benefits for Businesses

Regulatory Compliance: Stay ahead of EU e-invoicing mandates, streamlining interactions with governments and enterprises.
Data Accessibility: Merge visual and machine-readable data into a single document for increased flexibility.
Future-Proofing: Prepare for evolving e-documentation standards, including formats like Factur-X and Order-X for order processing.

Enhancing Compliance with XMP Metadata Manipulation

To fully align with ZUGFeRD specifications, IronPDF also supports the manipulation of XMP metadata, a critical component for embedding compliant XML files. This ensures businesses meet regulatory requirements while simplifying the creation, storage, and automation of invoices.

Why Choose IronPDF for Your E-Invoicing Workflows?

IronPDF empowers businesses to:

Simplify Invoice Automation: Generate, embed, and process e-invoices with ease.
Ensure Compliance: Meet legal requirements for e-invoicing and document archiving.
Save Time and Resources: Automate workflows while ensuring future-proof flexibility for evolving standards.

Ready to Make the Switch?

IronPDF's support for PDF/A-3 and ZUGFeRD compliance puts your business ahead of the curve, ensuring smooth invoicing workflows and legal adherence.

Discover How to Extract Invoice data from PDF in Python.

IronPDF is part of the Iron Suite, a comprehensive toolkit for developers. Learn more about Iron Suite here.

Please note: Adobe Acrobat, Foxit PhantomPDF, Nitro Pro, PDFelement, Soda PDF, and CutePDF are registered trademarks of their respective owners. This site is not affiliated with, endorsed by, or sponsored by Adobe Acrobat, Foxit PhantomPDF, Nitro Pro, PDFelement, Soda PDF, or CutePDF. All product names, logos, and brands are property of their respective owners. Comparisons are for informational purposes only and reflect publicly available information at the time of writing.

Curtis Chau

Chat with engineering team now

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.

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