I often get following image throught email from people starting with jsreport
This is what phantom-pdf recipe will render by default when you try to render some national characters (china, czech..)
There is a easy fix for this. Add coding to the html header. ščěščě
<html>
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body>
Česko není Čečensko
</body>
</html>
Then yoou will get proper result