diff --git a/hr_expense_report_merge_attachment/controllers/main.py b/hr_expense_report_merge_attachment/controllers/main.py
index 89ecf0d..b666aab 100644
--- a/hr_expense_report_merge_attachment/controllers/main.py
+++ b/hr_expense_report_merge_attachment/controllers/main.py
@@ -9,6 +9,11 @@ from odoo import http
 from reportlab.pdfgen import canvas
 from reportlab.lib.utils import ImageReader
 from reportlab.lib.pagesizes import letter, A4
+try:
+    from pillow_heif import register_heif_opener
+    register_heif_opener()
+except ImportError:
+    pass
 
 logger = logging.getLogger(__name__)
 
@@ -50,14 +55,25 @@ class Extension(main.ReportController):
                     except PyPDF2.utils.PdfReadError: # Case of non-pdf attachments
                         logger.info('Attachment %s cannot be merged in expense report'%(att.name,))
                 elif 'image/' in att.mimetype:
-                    packet = io.BytesIO()                    
-                    can = canvas.Canvas(packet)
-                    img = ImageReader(io.BytesIO(base64.b64decode(att.datas)))
-                    can.drawImage(img, 0, 0, A4[0]*0.9, A4[1]*0.9, preserveAspectRatio=True)
-                    can.save()
-                    packet.seek(0)
-                    attachment_reader = OdooPdfFileReader(packet)
-                    writer.addPage(attachment_reader.getPage(0))
+                    try:
+                        from PIL import Image as PilImage
+                        raw = base64.b64decode(att.datas)
+                        pil_img = PilImage.open(io.BytesIO(raw))
+                        if pil_img.mode not in ('RGB', 'RGBA'):
+                            pil_img = pil_img.convert('RGB')
+                        jpeg_buffer = io.BytesIO()
+                        pil_img.save(jpeg_buffer, format='JPEG')
+                        jpeg_buffer.seek(0)
+                        packet = io.BytesIO()
+                        can = canvas.Canvas(packet)
+                        img = ImageReader(jpeg_buffer)
+                        can.drawImage(img, 0, 0, A4[0]*0.9, A4[1]*0.9, preserveAspectRatio=True)
+                        can.save()
+                        packet.seek(0)
+                        attachment_reader = OdooPdfFileReader(packet)
+                        writer.addPage(attachment_reader.getPage(0))
+                    except Exception:
+                        logger.info('Attachment %s cannot be merged in expense report', att.name)
 
             # Write new pdf to res.data
             buffer = io.BytesIO()
@@ -66,4 +82,4 @@ class Extension(main.ReportController):
 
             res.data = pdf_content
 
-        return res
\ No newline at end of file
+        return res