Fillable Form

[Nkalzamel]

How to prevent saving a PDF fillable document unless the person completes all required fields in a fillable pdf application form?

[Bernd Alheit]

Not possible.

[Nkalzamel]

What is the purpose of having a required field then?

like I have a fillable job application form and I want people to fill in all required fields but still it allows them to save the file without completing all required fields!

[Bernd Alheit]

Acrobat Reader will check the required fields when you submit the form.

[try67]

I've developed a (paid-for) tool that allows you to utilize the required fields when the file is saved and/or printed.

It can't prevent the file from being saved entirely (technically not possible), but it can force the saved copy to be blank (ie, none of the form data is actually saved), and display an error message to the user. You can find it here: Custom-made Adobe Scripts: Acrobat -- Validate Required Fields Before Printing or Saving