WordPress: Contact Form 7 Placeholder without editing the plugin

Now, add the following code in your theme’s head tag, usually it will be inside header.php.

<script>
jQuery(document).ready(function() {
jQuery("form p span input").each(function() {
jQuery(this).attr("placeholder", jQuery(this).attr("title"));
});

jQuery("form p span textarea").each(function() {
jQuery(this).attr("placeholder", jQuery(this).text());
jQuery(this).text("")
});
});
</script>

Just create a watermark with the value you want for placeholder.

[text name watermark "Full Name"]