diff --git a/themes/2026/layouts/_partials/article-header.html b/themes/2026/layouts/_partials/article-header.html
index 3697320a..0915fe4b 100644
--- a/themes/2026/layouts/_partials/article-header.html
+++ b/themes/2026/layouts/_partials/article-header.html
@@ -76,7 +76,11 @@
       {{- if gt $coverDisplay.Width 1480 -}}
         {{- $coverWidth = 1480 -}}
       {{- end -}}
-      {{- $coverDisplay = $coverImage.Resize (printf "%dx webp q80" $coverWidth) -}}
+      {{- $coverDisplay = partial "media/process-image.html" (dict
+        "image" $coverImage
+        "action" "Resize"
+        "spec" (printf "%dx" $coverWidth)
+      ) -}}
     {{- end -}}
   {{- end -}}
 {{- end -}}
diff --git a/themes/2026/layouts/_partials/asides/complementary-images.html b/themes/2026/layouts/_partials/asides/complementary-images.html
index 5be2e072..eea06487 100644
--- a/themes/2026/layouts/_partials/asides/complementary-images.html
+++ b/themes/2026/layouts/_partials/asides/complementary-images.html
@@ -100,7 +100,11 @@
         {{- $title := default (printf "Image complémentaire : %s" $imageName) (index $data "title") -}}
         {{- $thumbnail := . -}}
         {{- if and (ne .MediaType.SubType "svg") (gt .Width 360) -}}
-          {{- $thumbnail = .Resize "360x webp q80" -}}
+          {{- $thumbnail = partial "media/process-image.html" (dict
+            "image" .
+            "action" "Resize"
+            "spec" "360x"
+          ) -}}
         {{- end -}}
       <li>
         <a href="{{ .RelPermalink }}" title="{{ $title }}">
diff --git a/themes/2026/layouts/_partials/card.html b/themes/2026/layouts/_partials/card.html
index 6fbf5759..c7c2690f 100644
--- a/themes/2026/layouts/_partials/card.html
+++ b/themes/2026/layouts/_partials/card.html
@@ -41,8 +41,6 @@
   {{- $thumbnailTransform = "900x506" -}}
 {{- end -}}
 
-{{- $thumbnailOptions := printf "%s webp q80" $thumbnailTransform -}}
-
 {{- $coverPath := $page.Params.cover -}}
 {{- $image := false -}}
 {{- if $coverPath -}}
@@ -111,7 +109,11 @@
     <a href="{{ $page.RelPermalink }}">
       <figure>
         {{- with $image -}}
-        {{- $resized := .Fill $thumbnailOptions -}}
+        {{- $resized := partial "media/process-image.html" (dict
+          "image" .
+          "action" "Fill"
+          "spec" $thumbnailTransform
+        ) -}}
         <img src="{{ $resized.RelPermalink }}" alt="Image de couverture pour {{ $page.Title }}" loading="lazy">
         {{- end -}}
       </figure>
@@ -127,7 +129,11 @@
   <a href="{{ $page.RelPermalink }}">
     <figure>
       {{- with $image -}}
-      {{- $resized := .Fill $thumbnailOptions -}}
+      {{- $resized := partial "media/process-image.html" (dict
+        "image" .
+        "action" "Fill"
+        "spec" $thumbnailTransform
+      ) -}}
       <img src="{{ $resized.RelPermalink }}" alt="Image de couverture pour {{ $page.Title }}" loading="lazy">
       {{- end -}}
     </figure>
diff --git a/themes/2026/layouts/_partials/media/display-img.html b/themes/2026/layouts/_partials/media/display-img.html
index 95d920f3..3b7cd029 100644
--- a/themes/2026/layouts/_partials/media/display-img.html
+++ b/themes/2026/layouts/_partials/media/display-img.html
@@ -15,13 +15,21 @@
     {{- if gt $image.Width $maxWidth -}}
       {{- $targetWidth = $maxWidth -}}
     {{- end -}}
-    {{- $display = $image.Resize (printf "%dx webp q80" $targetWidth) -}}
+    {{- $display = partial "media/process-image.html" (dict
+      "image" $image
+      "action" "Resize"
+      "spec" (printf "%dx" $targetWidth)
+    ) -}}
   {{- else -}}
     {{- $targetHeight := $image.Height -}}
     {{- if gt $image.Height 900 -}}
       {{- $targetHeight = 900 -}}
     {{- end -}}
-    {{- $display = $image.Resize (printf "x%d webp q80" $targetHeight) -}}
+    {{- $display = partial "media/process-image.html" (dict
+      "image" $image
+      "action" "Resize"
+      "spec" (printf "x%d" $targetHeight)
+    ) -}}
   {{- end -}}
 {{- end -}}
 
diff --git a/themes/2026/layouts/_partials/media/process-image.html b/themes/2026/layouts/_partials/media/process-image.html
new file mode 100644
index 00000000..d12eb461
--- /dev/null
+++ b/themes/2026/layouts/_partials/media/process-image.html
@@ -0,0 +1,30 @@
+{{/* Préserve les GIF animés en évitant toute transformation Hugo. */}}
+{{- $image := .image -}}
+{{- if not $image -}}
+  {{- errorf "media/process-image.html: missing image resource" -}}
+{{- end -}}
+
+{{- $action := .action -}}
+{{- if not $action -}}
+  {{- errorf "media/process-image.html: missing image action for %q" $image.Name -}}
+{{- end -}}
+
+{{- $spec := .spec -}}
+{{- if not $spec -}}
+  {{- errorf "media/process-image.html: missing image spec for %q" $image.Name -}}
+{{- end -}}
+
+{{- $result := $image -}}
+{{- $subType := lower $image.MediaType.SubType -}}
+{{- if and (ne $subType "svg") (ne $subType "gif") -}}
+  {{- $options := printf "%s webp q80" $spec -}}
+  {{- if eq $action "Fill" -}}
+    {{- $result = $image.Fill $options -}}
+  {{- else if eq $action "Resize" -}}
+    {{- $result = $image.Resize $options -}}
+  {{- else -}}
+    {{- errorf "media/process-image.html: unsupported image action %q for %q" $action $image.Name -}}
+  {{- end -}}
+{{- end -}}
+
+{{- return $result -}}
diff --git a/themes/2026/layouts/_partials/oeuvres/l-anankeisme.html b/themes/2026/layouts/_partials/oeuvres/l-anankeisme.html
index 53eebfea..9fccdfb4 100644
--- a/themes/2026/layouts/_partials/oeuvres/l-anankeisme.html
+++ b/themes/2026/layouts/_partials/oeuvres/l-anankeisme.html
@@ -4,7 +4,11 @@
       {{- $assetPath := "images/oeuvres/l-anankeisme.png" -}}
       {{- $source := resources.Get $assetPath -}}
       {{- if $source -}}
-      {{- $img := $source.Resize "320x webp q80" -}}
+      {{- $img := partial "media/process-image.html" (dict
+        "image" $source
+        "action" "Resize"
+        "spec" "320x"
+      ) -}}
       <img src="{{ $img.RelPermalink }}" width="{{ $img.Width }}" height="{{ $img.Height }}" alt="Couverture de L'Anankéisme" loading="lazy">
       {{- end -}}
     </figure>
diff --git a/themes/2026/layouts/_partials/oeuvres/l-humain-cette-espece-primitive.html b/themes/2026/layouts/_partials/oeuvres/l-humain-cette-espece-primitive.html
index c9510655..06a3503f 100644
--- a/themes/2026/layouts/_partials/oeuvres/l-humain-cette-espece-primitive.html
+++ b/themes/2026/layouts/_partials/oeuvres/l-humain-cette-espece-primitive.html
@@ -4,7 +4,11 @@
       {{- $assetPath := "images/oeuvres/l-humain-cette-espece-primitive.jpeg" -}}
       {{- $source := resources.Get $assetPath -}}
       {{- if $source -}}
-      {{- $img := $source.Resize "320x webp q80" -}}
+      {{- $img := partial "media/process-image.html" (dict
+        "image" $source
+        "action" "Resize"
+        "spec" "320x"
+      ) -}}
       <img src="{{ $img.RelPermalink }}" width="{{ $img.Width }}" height="{{ $img.Height }}" alt="Couverture de L'Humain, cette espèce primitive" loading="lazy">
       {{- end -}}
     </figure>
diff --git a/themes/2026/layouts/_partials/site-title.html b/themes/2026/layouts/_partials/site-title.html
index e8717c48..cab12416 100644
--- a/themes/2026/layouts/_partials/site-title.html
+++ b/themes/2026/layouts/_partials/site-title.html
@@ -6,7 +6,11 @@
 {{- $logo := resources.GetMatch $logoPath -}}
 <a href="{{ "/" | relURL }}" aria-label="Revenir à l'accueil">
   {{- with $logo -}}
-  {{- $resized := .Resize "64x webp q80" -}}
+  {{- $resized := partial "media/process-image.html" (dict
+    "image" .
+    "action" "Resize"
+    "spec" "64x"
+  ) -}}
   <img src="{{ $resized.RelPermalink }}" alt="">
   {{- end -}}
   <strong>{{ $site.Title }}</strong>
diff --git a/themes/2026/layouts/_partials/timeline-list.html b/themes/2026/layouts/_partials/timeline-list.html
index b8770f56..35104eb5 100644
--- a/themes/2026/layouts/_partials/timeline-list.html
+++ b/themes/2026/layouts/_partials/timeline-list.html
@@ -36,7 +36,11 @@
         {{- with $image -}}
         <a href="{{ $page.RelPermalink }}">
           <figure>
-            {{- $resized := .Fill "600x340 webp q80" -}}
+            {{- $resized := partial "media/process-image.html" (dict
+              "image" .
+              "action" "Fill"
+              "spec" "600x340"
+            ) -}}
             <img src="{{ $resized.RelPermalink }}" alt="Image de couverture pour {{ $page.Title }}" loading="lazy">
           </figure>
         </a>
diff --git a/themes/2026/layouts/home.html b/themes/2026/layouts/home.html
index ac4f8fe7..b80da435 100644
--- a/themes/2026/layouts/home.html
+++ b/themes/2026/layouts/home.html
@@ -315,7 +315,11 @@
           <a href="{{ $page.RelPermalink }}">
               <figure>
               {{- with $image -}}
-              {{- $resized := .Fill "166x91 webp q80" -}}
+              {{- $resized := partial "media/process-image.html" (dict
+                "image" .
+                "action" "Fill"
+                "spec" "166x91"
+              ) -}}
               <img src="{{ $resized.RelPermalink }}" alt="Capture du lien {{ $page.Title }}" loading="lazy">
               {{- end -}}
             </figure>
@@ -401,7 +405,11 @@
             <a href="{{ $item.RelPermalink }}" title="{{ $item.Title }}">
               <figure>
                 {{- with $itemImage -}}
-                {{- $resized := .Resize "x128 webp q80" -}}
+                {{- $resized := partial "media/process-image.html" (dict
+                  "image" .
+                  "action" "Resize"
+                  "spec" "x128"
+                ) -}}
                 <img src="{{ $resized.RelPermalink }}" alt="{{ $item.Title }}" title="{{ $item.Title }}" loading="lazy">
                 {{- end -}}
               </figure>