Tag
Form Logic
The programmable side of PDF forms: field validation, calculated values, conditional behaviour, and the JavaScript that drives them.
2 posts
How to Add Validation to a PDF Form (So Your Data Stays Clean)
A PDF form is only as good as the data it produces. Without validation, users will leave required fields blank, type "N/A" where you expected a number, enter…
May 7, 2026·8 min read
How to Add Calculations to a PDF Form (Subtotals, Totals, and Real Math)
A fillable PDF that does arithmetic for the user is dramatically more useful than one that asks them to fill in every total themselves. Quantity times price…
May 6, 2026·7 min read