diff --git a/xterm/config b/xterm/config
index b6693259a..f34f53b0f 100644
--- a/xterm/config
+++ b/xterm/config
@@ -1,4 +1,5 @@
 xterm=xterm-256color
+fontsize=15
 base_port=555
 rcfile=0
 locale=0
diff --git a/xterm/config.info b/xterm/config.info
index 6d098b138..c2dc2c77a 100644
--- a/xterm/config.info
+++ b/xterm/config.info
@@ -1,5 +1,6 @@
 xterm=Set <tt>TERM</tt> environmental variable to,4,xterm+256color-xterm&#45;256color,xterm+16color-xterm&#45;16color,xterm-xterm,vt102-vt102,vt100-vt100,vt52-vt52,rxvt-rxvt,nsterm-nsterm,dtterm-dtterm,ansi-ansi
 size=Terminal width and height in characters,3,Automatic,5,,,Static (80x24)
+fontsize=Adjust font size,4,0-Auto,12-Small,15-Normal,18-Large,21-Huge
 locale=Set shell character encoding,10,0-Shell default,1-<tt>en_US.UTF&#45;8</tt>,Custom
 rcfile=Execute initialization commands from file,10,0-Shell default,1-Module default,Custom
 screen_reader=Enable screen reader mode,1,true-Yes,false-No
diff --git a/xterm/index.cgi b/xterm/index.cgi
index 749e3520b..6adbe919e 100755
--- a/xterm/index.cgi
+++ b/xterm/index.cgi
@@ -55,6 +55,7 @@ my $def_cols_n = 80;
 my $def_rows_n = 24;
 my $xmlhr = $ENV{'HTTP_X_REQUESTED_WITH'} eq "XMLHttpRequest";
 my %term_opts;
+my $font_size = $config{'fontsize'} || 15;
 
 # Parse module config
 my ($conf_cols_n, $conf_rows_n) = ($conf_size_str =~ /([\d]+)X([\d]+)/i);
@@ -74,7 +75,9 @@ if ($conf_cols_n && $conf_rows_n && !$xmlhr) {
 
 # Define columns and rows
 my $conf_screen_reader = $config{'screen_reader'} eq 'true' ? 'true' : 'false';
-$termjs_opts{'Options'} = "{ cols: $env_cols, rows: $env_rows, screenReaderMode: $conf_screen_reader }";
+$termjs_opts{'Options'} = "{ cols: $env_cols, rows: $env_rows, ".
+			    "screenReaderMode: $conf_screen_reader, ".
+			    "fontSize: $font_size }";
 
 my $term_size = "
 	min-width: ".($conf_cols_n ? "".($conf_cols_n * 9)."px" : "calc(100vw - 22px)").";