AcroForms vs. XFA: Which PDF Form Type Should You Use?
The Short Answer
If you are building new forms today: use AcroForm. It is the ISO standard, works in every major PDF viewer, is compatible with PDF 2.0 and PDF/A, and is supported across Chrome, Firefox, Safari, iOS, and Android without any viewer dependency.
If you have existing XFA forms: your path forward depends on whether those forms need to remain interactive. Flatten completed forms to static PDF for compliance archiving. Convert interactive forms from XFA to AcroForm for continued use in modern workflows.
If you are trying to understand what you have: read on. This guide covers the structural differences, the compliance picture, and the practical implications for developers and architects managing PDF forms at scale.
What Are AcroForms?
AcroForms are the native interactive form format defined in the PDF specification. They store form fields, field values, and field properties directly within the PDF document structure. AcroForms use standard PDF marking operators for visual rendering, which means any compliant PDF viewer can render them correctly without any special engine.
AcroForms support text fields, checkboxes, radio buttons, dropdown lists, list boxes, signature fields, and push button actions. They are defined in the PDF specification and included in PDF 2.0 (ISO 32000-2:2017). They are the only interactive form format permitted in PDF/A-2 and later archiving standards.
What Is XFA?
XFA (XML Forms Architecture) is a form description language developed by Adobe and based on XML. XFA describes form structure, logic, data binding, and rendering using XML grammar rather than native PDF marking operators. XFA forms come in two subtypes.
Static XFA
Static XFA forms use PDF marking operators for the base page appearance and XFA grammar for form logic and field definitions. They look like regular PDFs when rendered but use XFA internally for field behavior. Static XFA has broader viewer support than dynamic XFA because the base visual rendering relies on PDF content streams.
Dynamic XFA
Dynamic XFA forms use XFA exclusively for both visual rendering and form logic. There is no PDF-based page appearance. The entire form layout, including page size, field positions, and text flow, is calculated by the XFA rendering engine at open time. Dynamic XFA is the most powerful form type for complex, data-driven forms, but it has the least viewer support and the most migration complexity.
AcroForms vs. XFA: Full Comparison
Choosing the Right Form Type: A Decision Framework
Use AcroForm if you are building new forms
There is no good reason to create new XFA forms in 2026. AcroForm is the standard, supported everywhere, and compatible with all current and future PDF specifications. If you are designing a new forms workflow from scratch, AcroForm is the correct choice.
Flatten static or dynamic XFA if the forms are complete and need to be archived
For completed XFA forms that need to go into a long-term archive, compliance repository, or regulatory submission, flattening to static PDF is the fastest and safest path. Flattening converts the form to non-interactive PDF page content that any PDF viewer can render correctly.
Convert XFA to AcroForm if the forms still need to be interactive
If users still need to fill out, review, or digitally sign these forms, convert XFA to AcroForm. This gives you a standards-compliant interactive form that works in Chrome, on mobile, in automated pipelines, and in PDF/A-compliant archiving workflows once complete.
Evaluate your XFA inventory before assuming a single path
Many organizations have both static and dynamic XFA forms, sometimes in the same document repository. Static XFA is easier to convert cleanly. Dynamic XFA may require more review. An API-level approach using Forms Extension lets you process both types programmatically and route documents to the correct conversion path based on form type detection.
Frequently Asked Questions
What is the difference between AcroForms and XFA?
AcroForms are the native PDF interactive form standard defined in the PDF specification and supported in PDF 2.0. XFA is an Adobe-proprietary XML-based form format that was deprecated in PDF 2.0. AcroForms work in all modern viewers. XFA requires Acrobat or an XFA-capable rendering engine.
Which is better, AcroForms or XFA?
For new development and long-term compatibility, AcroForms are the better choice. XFA offers more powerful dynamic layout and data binding capabilities, but those advantages do not outweigh the viewer compatibility, compliance, and migration costs for most organizations in 2026.
Are AcroForms supported in PDF 2.0?
Yes. AcroForms are defined in the PDF specification and fully supported in PDF 2.0. XFA is explicitly not included in PDF 2.0.
What PDF form format should I use in 2026?
Use AcroForm for new forms. For existing XFA forms, flatten completed forms for archiving and convert interactive forms to AcroForm for ongoing use.
Need to process XFA or AcroForms programmatically? Try Forms Extension free right now.