diff --git a/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts b/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts
index 11fbb3c..098528a 100644
--- a/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts
+++ b/ApiCore-Backend/src/label-templates/label-templates.service.spec.ts
@@ -247,6 +247,33 @@ describe('LabelTemplatesService', () => {
       expect(countPages(pdf)).toBe(3);
     });
 
+    it('clamps an explicit columns/rows override that would run labels off the A4 page', async () => {
+      // widthMm:90, marginLeftMm:5, gapXMm:2 only fit 2 columns on A4 - an
+      // explicit 99 would place columns 3+ past the page's right edge,
+      // where a printer just clips them instead of printing anything.
+      prisma.labelTemplate.findUnique.mockResolvedValue({
+        ...template,
+        columns: 99,
+        rows: 1,
+      });
+      prisma.bottlingBatch.findUnique.mockResolvedValue({
+        id: 'batch-1',
+        jarSize: 500,
+        jarCount: 3,
+        lotNumber: 'L-001',
+        date: new Date('2026-06-01T00:00:00.000Z'),
+        bestBeforeDate: new Date('2028-06-01T00:00:00.000Z'),
+        honeyBatch: { batchNumber: 'HB-001', honeyType: 'Bluetenhonig' },
+        product: { name: 'Glas 500g' },
+      });
+
+      const pdf = await service.renderLabelsPdf('template-1', 'batch-1');
+
+      // Clamped to the real max of 2 columns x 1 row = 2 per page, so 3
+      // copies still need 2 pages - same as the explicit columns:2 test.
+      expect(countPages(pdf)).toBe(2);
+    });
+
     it('skips already-used slots on the first sheet via startPosition, but not later sheets', async () => {
       prisma.labelTemplate.findUnique.mockResolvedValue({
         ...template,
diff --git a/ApiCore-Backend/src/label-templates/label-templates.service.ts b/ApiCore-Backend/src/label-templates/label-templates.service.ts
index 1773dbd..d11bcec 100644
--- a/ApiCore-Backend/src/label-templates/label-templates.service.ts
+++ b/ApiCore-Backend/src/label-templates/label-templates.service.ts
@@ -237,15 +237,21 @@ export class LabelTemplatesService {
         layout;
       const usableWidthMm = A4_WIDTH_MM - 2 * marginLeftMm;
       const usableHeightMm = A4_HEIGHT_MM - 2 * marginTopMm;
-      const columns =
-        layout.columns ??
-        Math.max(1, Math.floor((usableWidthMm + gapXMm) / (widthMm + gapXMm)));
-      const rows =
-        layout.rows ??
-        Math.max(
-          1,
-          Math.floor((usableHeightMm + gapYMm) / (heightMm + gapYMm)),
-        );
+      const maxColumns = Math.max(
+        1,
+        Math.floor((usableWidthMm + gapXMm) / (widthMm + gapXMm)),
+      );
+      const maxRows = Math.max(
+        1,
+        Math.floor((usableHeightMm + gapYMm) / (heightMm + gapYMm)),
+      );
+      // An explicit columns/rows value from the sheet-layout designer is
+      // clamped to what actually fits the A4 page - without this, a value
+      // typed in by the user (or already saved from before this fix) would
+      // place labels past the page's right/bottom edge, where printers just
+      // clip them instead of printing anything.
+      const columns = Math.min(layout.columns ?? maxColumns, maxColumns);
+      const rows = Math.min(layout.rows ?? maxRows, maxRows);
       const perPage = columns * rows;
       // startPosition only skips ahead on the first sheet (partially-used
       // physical sheet, e.g. a few labels already peeled off) - every sheet
diff --git a/ApiCore-Frontend/src/app/(app)/settings/label-templates/designer/label-designer.tsx b/ApiCore-Frontend/src/app/(app)/settings/label-templates/designer/label-designer.tsx
index a89cb43..5556efe 100644
--- a/ApiCore-Frontend/src/app/(app)/settings/label-templates/designer/label-designer.tsx
+++ b/ApiCore-Frontend/src/app/(app)/settings/label-templates/designer/label-designer.tsx
@@ -35,6 +35,8 @@ import { LabelCanvas } from "./label-canvas";
 import { ElementPropertiesPanel } from "./element-properties-panel";
 
 const ELEMENT_TYPES = ["text", "qrCode", "image", "line"] as const;
+const A4_WIDTH_MM = 210;
+const A4_HEIGHT_MM = 297;
 const ZOOM_STEPS: number[] = [0.5, 0.75, 1, 1.25, 1.5, 2];
 const ZOOM_MIN = ZOOM_STEPS[0];
 const ZOOM_MAX = ZOOM_STEPS[ZOOM_STEPS.length - 1];
@@ -152,6 +154,21 @@ export function LabelDesigner({ initial, onSubmit, submitLabel }: LabelDesignerP
 
   const selectedElement = elements.find((element) => element.id === selectedId) ?? null;
 
+  // Mirrors the backend's clamp in label-templates.service.ts exactly, so
+  // the hint shown here always matches what actually prints - a value typed
+  // in above this is silently capped server-side rather than running labels
+  // off the physical A4 page.
+  const maxColumns = Math.max(
+    1,
+    Math.floor((A4_WIDTH_MM - 2 * marginLeftMm + gapXMm) / (widthMm + gapXMm)),
+  );
+  const maxRows = Math.max(
+    1,
+    Math.floor((A4_HEIGHT_MM - 2 * marginTopMm + gapYMm) / (heightMm + gapYMm)),
+  );
+  const columnsExceedsMax = columns !== null && columns > maxColumns;
+  const rowsExceedsMax = rows !== null && rows > maxRows;
+
   function addElement(element: LabelElement) {
     setElements((current) => [...current, element]);
     setSelectedId(element.id);
@@ -365,9 +382,11 @@ export function LabelDesigner({ initial, onSubmit, submitLabel }: LabelDesignerP
           </CardHeader>
           <CardContent className="flex flex-col gap-4">
             <p className="text-xs text-muted-foreground">
-              Spalten/Zeilen leer lassen, um automatisch so viele einzuplanen wie passen. Feste
-              Werte eintragen, um exakt zum vorgedruckten Raster eines Etikettenbogens (z.B.
-              Avery-Vorlage) zu passen.
+              Spalten/Zeilen leer lassen, um automatisch so viele einzuplanen wie passen (aktuell{" "}
+              {maxColumns} × {maxRows}). Feste Werte eintragen, um exakt zum vorgedruckten Raster
+              eines Etikettenbogens (z.B. Avery-Vorlage) zu passen - mehr als {maxColumns} Spalten
+              bzw. {maxRows} Zeilen passen bei dieser Etikettengröße und diesen Rändern nicht auf
+              ein A4-Blatt und werden beim Drucken abgeschnitten.
             </p>
             <div className="flex gap-3">
               <div className="flex flex-1 flex-col gap-2">
@@ -382,6 +401,11 @@ export function LabelDesigner({ initial, onSubmit, submitLabel }: LabelDesignerP
                     setColumns(event.target.value === "" ? null : Number(event.target.value))
                   }
                 />
+                {columnsExceedsMax ? (
+                  <p className="text-xs text-destructive">
+                    Passt nicht auf A4 - maximal {maxColumns} Spalte{maxColumns === 1 ? "" : "n"}.
+                  </p>
+                ) : null}
               </div>
               <div className="flex flex-1 flex-col gap-2">
                 <Label htmlFor="designer-rows">Zeilen</Label>
@@ -395,6 +419,11 @@ export function LabelDesigner({ initial, onSubmit, submitLabel }: LabelDesignerP
                     setRows(event.target.value === "" ? null : Number(event.target.value))
                   }
                 />
+                {rowsExceedsMax ? (
+                  <p className="text-xs text-destructive">
+                    Passt nicht auf A4 - maximal {maxRows} Zeile{maxRows === 1 ? "" : "n"}.
+                  </p>
+                ) : null}
               </div>
             </div>
             <div className="flex gap-3">