diff --git a/geneit_app/src/widgets/simple_family_tree/SimpleFamilyTree.tsx b/geneit_app/src/widgets/simple_family_tree/SimpleFamilyTree.tsx
index a16707f..8f3d00b 100644
--- a/geneit_app/src/widgets/simple_family_tree/SimpleFamilyTree.tsx
+++ b/geneit_app/src/widgets/simple_family_tree/SimpleFamilyTree.tsx
@@ -162,7 +162,7 @@ export function SimpleFamilyTree(p: {
   console.info(`tree width=${tree.width} height=${height}`);
 
   const doExport = async (onlySVG: boolean) => {
-    const el = document.querySelector(".simpletree")!;
+    const el: HTMLElement = document.querySelector(".simpletree")!;
     const svg = el.outerHTML;
 
     // Download in SVG format
@@ -178,10 +178,18 @@ export function SimpleFamilyTree(p: {
 
     const PDF_MARGIN = 10;
 
+    const PDF_MAX_SIZE = 14400 - PDF_MARGIN * 2;
+
+    const tree_width = Math.min(tree.width, PDF_MAX_SIZE);
+    const tree_height = Math.min(height, PDF_MAX_SIZE);
+
+    console.info(`pdf tree w=${tree_width} h=${tree_height}`);
+
     // Download in PDF format
     const doc = new jsPDF({
       orientation: "l",
-      format: [height + PDF_MARGIN * 2, tree.width + PDF_MARGIN * 2],
+      unit: "px",
+      format: [tree_height + PDF_MARGIN * 2, tree_width + PDF_MARGIN * 2],
     });
 
     doc.setFont("Roboto", "normal");
@@ -189,8 +197,8 @@ export function SimpleFamilyTree(p: {
     await doc.svg(el, {
       x: PDF_MARGIN,
       y: PDF_MARGIN,
-      height: height,
-      width: tree.width,
+      height: tree_height,
+      width: tree_width,
     });
 
     // Save the created pdf