diff --git a/script/thumbnail.sh b/script/thumbnail.sh
new file mode 100755
index 0000000..07e4589
--- /dev/null
+++ b/script/thumbnail.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# Usage:
+#   ASCIICAST_ID=666 COLS=80 LINES=20 COMMAND="df; df; df; sleep 10"
+#   DELAY=1 THUMB_LINES=5 THUMB_COLS=10 ./tmux-save.sh
+
+SESSION_NAME=asciiio-thumb-$ASCIICAST_ID
+
+tmux new -s $SESSION_NAME -d -x $COLS -y $LINES "$COMMAND"
+sleep $DELAY
+tmux capture-pane -t $SESSION_NAME
+tmux save-buffer - | tail -n $THUMB_LINES | ruby -e "ARGF.lines.each { |l| puts l[0...$THUMB_COLS] }"