Cacher is the code snippet organizer for pro developers

<?php
/**
 * Gravity Wiz // Gravity Forms // Uppercase Entry Value (by Field)
 */
// update "519" to your form ID and "1" to your field ID
add_filter( 'gform_get_input_value_519_1', function( $value ) {
	return strtoupper( $value );
} );