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Is there a way to make fields required so you cannot save the PDF?
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No there's not.
It generally would not be a good thing if you could, though I can understand it's something a few folks desire.
With JavaScript, you have the opportunity to encourage a user to complete the form (e.g., app.alert), but they can always choose not to.
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Preventing the file from being saved entirely is not possible. However, it is possible to force the fields in the saved copy to be blank, using a script.
I've created a (paid-for) tool that allows you to set it up very easily. You can find it here: https://www.try67.com/tool/acrobat-validate-required-fields-before-printing-or-saving
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No, you can display a warning to user if the document is saved with empty required fields but you cannot prevent user to save it anyway.