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I want to make a text area in an upcoming fillable pdf that has a limit of 250 characters. I would like to have below it a reference that shows the remaining characters left for that text area. Please see the picture example below.
Thank you for your ideas and knowledge!
You can use a custom Keystroke script to get the current length of the field's value and reduce that number from its character limit.
I've developed something similar to that in this (paid-for) tool I've developed: Custom-made Adobe Scripts: Acrobat -- "Live" Characters and Words Counter
See Countdown Maximum Length Input | for a sample form by D. P. Story.