What library is used to fill the PDF?

Question

PHP

Good afternoon. Repeatedly on the net I met this way of editing PDF:
https://www.oregon.gov/ODOT/Forms/Motcarr/9740.pdf
https://www.revenue.pa.gov/FormsandPublications/Fo...
https:/ /www.revenue.pa.gov/FormsandPublications/Fo...

Exactly works in Chrome. In other words, there is a PDF file, it has fields where the user can write something. Moreover, there is also a check of what is written, i.e. what horrible text you will not drive. There are also "Reset Form" and "Print" buttons. When the user has filled in the form with data, he can click on "print" and print the filled file.

Who knows what it is? Is it some sort of chrome feature? How can I do the same on my website?

Thank you in advance for your help

Answer 1

This is a PDF feature - you can make forms in it.
you can also make a regular web form and, based on the entered data, generate a completed pdf for printing.
each method has its pros/cons.