If you do not wish to change character encoding for the entire server, but only one site (or only one directory) then this is possible to do using .htaccess.
AddDefaultCharset UTF-8 |
If you only wish to do this to php or htm files (and not all files)
<FilesMatch "\.(htm|php)$"> AddDefaultCharset UTF-8 </FilesMatch> |
If you wish to modify the mime-type as well as the encoding (on html files in this example)
AddType 'text/html; charset=UTF-8' html |