Entering upper-case letter in text field of CF7

you need to access to user form data and capitalize the wanted fields

https://contactform7.com/2020/07/28/accessing-user-input-data/

hope it help!

Thank you for the hint, but I am not so experienced in developing. Therefore It would be nice if somebody can give me some code snippets.

I have tried this one, but it does not work.

add_Action( ‘wpcf7_before_send_mail’,
function( $contact_form, $abort, $submission ) {

// Getting user input through the your-message field
$your_message = $submission->get_posted_data( ‘your-message’ );
$your_message = strtoupper($your_message);

},
10, 3
);`

sorry the right hook was wpcf7_posted_data…

like this:

add_filter( 'wpcf7_posted_data',
	function ( $posted_data ) {
		$vorname = $posted_data['Vorname'];
		if( !empty( $vorname ) ){
			$posted_data['Vorname'] = strtoupper($vorname );
		}

		return $posted_data;
	}
, 10, 1 );

It has worked! Thank you.