diff --git a/frontend/src/tools/whiteboard.jsx b/frontend/src/tools/whiteboard.jsx
index a2cf1b8..34a006d 100644
--- a/frontend/src/tools/whiteboard.jsx
+++ b/frontend/src/tools/whiteboard.jsx
@@ -11,7 +11,7 @@ const TOOLS   = [
   { id:'rect',    label:'▭',  tip:'Rechteck' },
   { id:'ellipse', label:'◯',  tip:'Ellipse' },
   { id:'text',    label:'T',  tip:'Text' },
-  { id:'eraser',  label:'⌫',  tip:'Radierer' },
+  { id:'eraser',  label:'🧹', tip:'Radierer' },
 ];
 
 const CURSOR_COLORS = ['#FF6B9D','#4ECDC4','#FFE66D','#60A5FA','#A78BFA','#FB923C'];
@@ -143,8 +143,10 @@ function renderElements(ctx, elements, vp) {
       case 'eraser': {
         if (!el.points?.length) break;
         ctx.save();
-        ctx.globalCompositeOperation = 'destination-out';
-        ctx.lineWidth = (el.size || 20) / vp.zoom;
+        ctx.strokeStyle = '#0D0D0F'; // Hintergrundfarbe des Canvas
+        ctx.lineWidth = (el.size || 4) * 3 / vp.zoom; // Radierer ist 3× breiter als Stift
+        ctx.lineCap  = 'round';
+        ctx.lineJoin = 'round';
         ctx.beginPath();
         ctx.moveTo(el.points[0].x, el.points[0].y);
         for (const p of el.points.slice(1)) ctx.lineTo(p.x, p.y);