wkhtmltopdf --encoding utf-8 is not working for --footer-html.
I am using the following command. Both HTML files are also in utf8 format.
wkhtmltopdf --
Try adding the following line in the HTML head element of the footer:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Make sure you have specific font installed there. I need Hindi (Indian Language) on my PDF files. putting meta tag had not solved my problem. So i installed hindi fonts on my debian box by
sudo apt-get install fonts-indic