This technology actually uses PDF files merely as transport medium, the XML definitions of XFA forms define forms in a way that is independent of PDF as such. XFA (XML Forms Architecture) forms are an alternative forms technology introduced by Adobe which is referenced by the PDF specification (part 1) but which has remained in the Adobe legacy domain. A quick search on google can show you many options.ĭisplaying this kind of forms is possible on many PDF viewers, editing them visually at least on numerous of them. (Actually there is a dynamic sub-feature of this technology, page templates which fields, which allows you to add extra pages with their own fields, but this feature is hardly ever used.)Ĭreating and filling this kind of forms nowadays is possible using a wide selection of options, desktop applications (Adobe's Acrobat being just one among many), web applications, and general purpose PDF libraries for many languages or platforms. forms for which the number and positions of fields is already fixed at form definition time. This technology only allows static forms, i.e.

There actually are two major form technologies in use in PDFs: AcroForm forms and XFA forms.ĪcroForm forms are the original PDF forms technology conclusively specified in the PDF specification ISO 32000-1 (soon to be updated by part 2).

That been said, the question itself is not very exact. First of all, software recommendations have meanwhile become off-topic on stack overflow, different stack exchange sites for that have been established since then.

How to add fillable fields pdf