diff --git a/src/ui/screens/home_screen.py b/src/ui/screens/home_screen.py
index fac0824..a60d3ed 100644
--- a/src/ui/screens/home_screen.py
+++ b/src/ui/screens/home_screen.py
@@ -383,17 +383,20 @@ class HomeScreen(QWidget):
     # ─── Mini QR sur le bouton ───
 
     def _set_qr_button_icon(self):
-        """Génère un mini QR code et l'affiche sur le bouton QR Code."""
+        """Génère un QR code net et l'affiche en gros sur le bouton QR Code."""
         try:
             import qrcode
             import io
 
             self.config = load_config()
             upload_url = self.config["upload_url"]
-            qr = qrcode.QRCode(version=1, box_size=4, border=1)
+
+            # Haute résolution pour la netteté
+            qr = qrcode.QRCode(version=1, box_size=20, border=1,
+                                error_correction=qrcode.constants.ERROR_CORRECT_M)
             qr.add_data(upload_url)
             qr.make(fit=True)
-            img = qr.make_image(fill_color="white", back_color="transparent")
+            img = qr.make_image(fill_color="white", back_color="#2196F3")
 
             buffer = io.BytesIO()
             img.save(buffer, format="PNG")
@@ -403,11 +406,12 @@ class HomeScreen(QWidget):
 
             btn = self.mode_buttons.get("QR Code")
             if btn:
-                qr_size = max(40, btn.height() // 3) if btn.height() > 0 else 60
+                # QR prend 55% de la hauteur du bouton
+                qr_size = max(60, int(btn.height() * 0.55)) if btn.height() > 0 else 100
                 pixmap = QPixmap.fromImage(qimage).scaled(
                     qr_size, qr_size,
                     Qt.AspectRatioMode.KeepAspectRatio,
-                    Qt.TransformationMode.SmoothTransformation
+                    Qt.TransformationMode.FastTransformation  # Pas de lissage = QR net
                 )
                 btn.setIcon(QIcon(pixmap))
                 from PyQt6.QtCore import QSize