Adobe added the option to mark fields that can be filled out with text, boxes that can be checked, and other helpers for form completion at least a decade ago–so long ago, it’s hard to find out when.

Fill PDF forms programmatically with text and checkboxes. A Bot skill for populating fillable PDF forms (government forms, applications, surveys, etc.) with data while preserving proper appearance ...

php-pdftk brings the full power of pdftk to PHP - and more. Note: The pdftk version from the alternative PPA ppa:malteworld/ppa is no longer available. The author instead now points to his answer on ...