diff --git a/src/static/index.js b/src/static/index.js
index eb7e9d6..7a79c16 100644
--- a/src/static/index.js
+++ b/src/static/index.js
@@ -73,4 +73,16 @@ function exportReport() {
             calendarTextarea.value = 'Error während des Abrufs';
             console.error(error);
         });
-}
\ No newline at end of file
+}
+
+function autoResize(textarea) {
+    textarea.style.height = "auto";
+    textarea.style.height = textarea.scrollHeight + "px";
+}
+
+calendarTextarea.addEventListener('input', () => {
+    autoResize(calendarTextarea);
+});
+untisTextarea.addEventListener('input', () => {
+    autoResize(untisTextarea);
+});
\ No newline at end of file