diff --git a/images/layers/add_border.sh b/images/layers/add_border.sh
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--- /dev/null
+++ b/images/layers/add_border.sh
@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# GIMP commands for the screenshot preparation:
+# - Layer > Crop to Content [Alt + L, O, O, Enter]
+# - Image > Fit Canvas to Layers [Alt + I, A]
+
+filename="$1"
+bordercolor="#424242"
+bordersize=16
+
+if [ ! -f "$filename" ]; then
+  echo "Error: File not found: $filename"
+  exit 1
+fi
+
+convert \
+  "$filename" \
+  -bordercolor "$bordercolor" \
+  -border "${bordersize}x${bordersize}" \
+  "$filename"
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