AcroForm fields serve a similar purpose to tags, but differ in how they are created. Unlike tags, AcroForm fields can be added only using a PDF creation or editing tool (for example, Adobe Pro).
PDF editors provide predefined AcroForm field types—such as text fields, radio buttons, checkboxes, combo boxes, and signature fields—which can be directly inserted into a PDF document.
If an AcroForm field name contains specific characters, as described in the following sections, additional behavior or mandatory rules can be applied to the field.
The following prefixes for Acrofield names are currently in use:
| Signature Field (Android, Windows, iOS, Server) | |
| Optional Signature | Any name can be used (or SO) |
| Compulsory Signature | SC |
| Checkbox Field (Android, Windows, iOS, Server) | |
| Optional Checkbox | Any name can be used, standard checkbox is selected |
| Compulsory Checkbox | CR |
| Text Field – if used, Text Field can be filled when the document is displayed and can be signed. Not only via Form (Android, Windows, iOS, Server) | |
| Optional Text Field | TO |
| Compulsory Text Field | TC |
| Radio Button Group (Android, Windows, iOS, Server) | |
| Optional Radio button Group | RO |
| Compulsory Radio button Group | RC |
| Combo Box (Server) | |
| Optional combobox | CBO |
| Compulsory combobox | CBC |
| Photo Field (Android) | |
| Optional Photo Field | PO |
| Compulsory Photo Field | PC |
| Numeric Field (Android) | |
| Optional Numeric Field | NO |
| Compulsory Numeric Field | NC |
| Date Field – Calendar (Android) | |
| Optional Date Field – Calendar | DWO |
| Compulsory Date Field – Calendar | DWC |
| Date Field – Spinner (Android) | |
| Optional Date Field – Spinner | DO |
| Compulsory Date Field – Spinner | DC |
NOTE: 2 Acrofields cannot have completely the same name, in such cases, add character to the name (e.g. Acrofield 1: SO; Acrofield 2: SO1)