diff --git a/sbc_compassion/models/correspondence.py b/sbc_compassion/models/correspondence.py
index c353995b9..c6c6e2b1e 100644
--- a/sbc_compassion/models/correspondence.py
+++ b/sbc_compassion/models/correspondence.py
@@ -30,6 +30,8 @@
 
 _logger = logging.getLogger(__name__)
 
+ROWS_PER_ATTACHMENT_PAGE = 2
+
 
 class CorrespondenceType(models.Model):
     _name = "correspondence.type"
@@ -1124,8 +1126,9 @@ def _process_gmc_text(self, letter_vals):
     def get_attachments_per_page(self, flatten=False):
         """
         Used for the S2B report generation
-        We group 4 attachements per page, 2 per row.
-        We also convert them on the fly to jpg small size image.
+        We group 2 attachments per page, 1 per row, so that each picture takes
+        about half a page like it did with the previous FPDF layout (T3442).
+        We also convert them on the fly to jpg.
         :param flatten: If True, we return a flat list of images
         """
         self.ensure_one()
@@ -1133,21 +1136,13 @@ def get_attachments_per_page(self, flatten=False):
             lambda a: a.mimetype.startswith("image")
         )
         images = {0: {0: []}}
-        page, row = 0, 0
 
-        for attachment in attachments:
+        for index, attachment in enumerate(attachments):
             img_data = image_process(
-                base64.b64decode(attachment.datas), size=(400, 400), quality=75
+                base64.b64decode(attachment.datas), size=(1600, 1600), quality=85
             )
-            images[page][row].append(base64.b64encode(img_data))
-            if len(images[page][row]) == 2:
-                row += 1
-                images[page][row] = []
-
-            if row == 2:
-                page += 1
-                row = 0
-                images[page] = {row: []}
+            page, row = divmod(index, ROWS_PER_ATTACHMENT_PAGE)
+            images.setdefault(page, {})[row] = [base64.b64encode(img_data)]
 
         if flatten:
             flat_images = []
diff --git a/sbc_compassion/reports/correspondence_report.xml b/sbc_compassion/reports/correspondence_report.xml
index ea8fd09aa..aa490665b 100644
--- a/sbc_compassion/reports/correspondence_report.xml
+++ b/sbc_compassion/reports/correspondence_report.xml
@@ -112,16 +112,19 @@
               t-foreach="attachments_page_value"
               t-as="attachments_row"
             >
-                            <div class="row mx-5 my-5">
+                            <div class="row mx-3 my-4">
                                 <t
                   t-foreach="attachments_row_value"
                   t-as="attachment"
                 >
-                                    <div class="col-6 px-4">
-                                        <img
+                                    <div class="col-12 px-4">
+                                        <!-- Aspect-ratio box: wkhtmltopdf renders
+                                             CSS mm at ~0.8x, so size relative to the
+                                             page width and let the background fit
+                                             inside without distorting the picture. -->
+                                        <div
                       t-if="attachment"
-                      t-attf-src="data:image/jpeg;base64,{{attachment}}"
-                      class="w-100"
+                      t-attf-style="height: 0; padding-bottom: 70%; background-image: url('data:image/jpeg;base64,{{attachment}}'); background-size: contain; background-position: center; background-repeat: no-repeat;"
                     />
                                     </div>
                                 </t>