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If it is possible to convert all fields to uppercase? And I didn't understand exactly where to add?
To add the code above to any existing fields you need to go to your form Settings > Customise HTML and replace the [input] shortcode for each field with [input onkeyup="this.value = this.value.toUpperCase();"].
It's only intended to be used a few fields though and isn't really practical to do it for every field in the form, especially if it's a long form.
If you wanted to make every field in your form uppercase you'd be better off using jQuery or JS and putting the script in the 'After Content' section of the Customise HTML section.
E.g.