diff --git a/src/js/main.js b/src/js/main.js
index fe4bf6b..b35831c 100644
--- a/src/js/main.js
+++ b/src/js/main.js
@@ -321,6 +321,11 @@ function initWhiteboard() {
                 } else {
                     $("#textboxBackgroundColorPickerBtn").hide();
                 }
+                let savedThickness = localStorage.getItem("item_thickness_" + activeTool);
+                if (savedThickness) {
+                    whiteboard.setStrokeThickness(savedThickness);
+                    $("#whiteboardThicknessSlider").val(savedThickness);
+                }
             });
 
         // upload image button
@@ -584,8 +589,17 @@ function initWhiteboard() {
         $("#whiteboardThicknessSlider").on("input", function () {
             if (ReadOnlyService.readOnlyActive) return;
             whiteboard.setStrokeThickness($(this).val());
+            let activeTool = $(".whiteboard-tool.active").attr("tool");
+            localStorage.setItem("item_thickness_" + activeTool, $(this).val());
         });
 
+        let activeTool = $(".whiteboard-tool.active").attr("tool");
+        let savedThickness = localStorage.getItem("item_thickness_" + activeTool);
+        if (savedThickness) {
+            whiteboard.setStrokeThickness(savedThickness);
+            $("#whiteboardThicknessSlider").val(savedThickness);
+        }
+
         // handle drag&drop
         var dragCounter = 0;
         $("#whiteboardContainer").on("dragenter", function (e) {