diff --git a/app/helpers/gallery_helper.rb b/app/helpers/gallery_helper.rb
new file mode 100644
index 000000000..67068d480
--- /dev/null
+++ b/app/helpers/gallery_helper.rb
@@ -0,0 +1,21 @@
+module GalleryHelper
+  def displayable_pdf?(blob)
+    blob.previewable? && blob.content_type.in?(AUTHORIZED_PDF_TYPES)
+  end
+
+  def displayable_image?(blob)
+    blob.variable? && blob.content_type.in?(AUTHORIZED_IMAGE_TYPES)
+  end
+
+  def preview_url_for(attachment)
+    attachment.preview(resize_to_limit: [400, 400]).processed.url
+  end
+
+  def variant_url_for(attachment)
+    attachment.variant(resize_to_limit: [400, 400]).processed.url
+  end
+
+  def blob_url(attachment)
+    attachment.blob.content_type.in?(RARE_IMAGE_TYPES) ? attachment.variant(resize_to_limit: [2000, 2000]).processed.url : attachment.blob.url
+  end
+end
diff --git a/app/views/instructeurs/dossiers/pieces_jointes.html.haml b/app/views/instructeurs/dossiers/pieces_jointes.html.haml
index eb67f850c..d770433d4 100644
--- a/app/views/instructeurs/dossiers/pieces_jointes.html.haml
+++ b/app/views/instructeurs/dossiers/pieces_jointes.html.haml
@@ -8,21 +8,20 @@
       - champ.piece_justificative_file.with_all_variant_records.each do |attachment|
         .gallery-item
           - blob = attachment.blob
-          - if blob.previewable? && blob.content_type.in?(AUTHORIZED_PDF_TYPES)
+          - if displayable_pdf?(blob)
             = link_to blob.url, id: blob.id, data: { iframe: true, src: blob.url }, class: 'gallery-link', type: blob.content_type, title: "#{champ.libelle} -- #{blob.filename}" do
               .thumbnail
-                = image_tag(attachment.preview(resize_to_limit: [400, 400]).processed.url, loading: :lazy)
+                = image_tag(preview_url_for(attachment), loading: :lazy)
                 .fr-btn.fr-btn--tertiary.fr-btn--icon-left.fr-icon-eye{ role: :button }
                   Visualiser
             .champ-libelle
               = champ.libelle.truncate(25)
             = render Attachment::ShowComponent.new(attachment: attachment, truncate: true)
 
-          - elsif blob.variable? && blob.content_type.in?(AUTHORIZED_IMAGE_TYPES)
-            - blob_url = blob.content_type.in?(RARE_IMAGE_TYPES) ? attachment.variant(resize_to_limit: [2000, 2000]).processed.url : blob.url
-            = link_to image_url(blob_url), title: "#{champ.libelle} -- #{blob.filename}", data: { src: blob.url }, class: 'gallery-link' do
+          - elsif displayable_image?(blob)
+            = link_to image_url(blob_url(attachment)), title: "#{champ.libelle} -- #{blob.filename}", data: { src: blob.url }, class: 'gallery-link' do
               .thumbnail
-                = image_tag(attachment.variant(resize_to_limit: [400, 400]).processed.url, loading: :lazy)
+                = image_tag(variant_url_for(attachment), loading: :lazy)
                 .fr-btn.fr-btn--tertiary.fr-btn--icon-left.fr-icon-eye{ role: :button }
                   Visualiser
             .champ-libelle
diff --git a/app/views/shared/champs/piece_justificative/_show.html.haml b/app/views/shared/champs/piece_justificative/_show.html.haml
index 1624f86e1..abb301872 100644
--- a/app/views/shared/champs/piece_justificative/_show.html.haml
+++ b/app/views/shared/champs/piece_justificative/_show.html.haml
@@ -8,18 +8,17 @@
       - champ.piece_justificative_file.attachments.with_all_variant_records.each do |attachment|
         .gallery-item
           - blob = attachment.blob
-          - if blob.previewable? && blob.content_type.in?(AUTHORIZED_PDF_TYPES)
+          - if displayable_pdf?(blob)
             = link_to blob.url, id: blob.id, data: { iframe: true, src: blob.url }, class: 'gallery-link', type: blob.content_type, title: "#{champ.libelle} -- #{blob.filename}" do
               .thumbnail
-                = image_tag(attachment.preview(resize_to_limit: [400, 400]).processed.url, loading: :lazy)
+                = image_tag(preview_url_for(attachment), loading: :lazy)
                 .fr-btn.fr-btn--tertiary.fr-btn--icon-left.fr-icon-eye{ role: :button }
                   = 'Visualiser'
 
-          - elsif blob.variable? && blob.content_type.in?(AUTHORIZED_IMAGE_TYPES)
-            - blob_url = blob.content_type.in?(RARE_IMAGE_TYPES) ? attachment.variant(resize_to_limit: [2000, 2000]).processed.url : blob.url
-            = link_to image_url(blob_url), title: "#{champ.libelle} -- #{blob.filename}", data: { src: blob.url }, class: 'gallery-link' do
+          - elsif displayable_image?(blob)
+            = link_to image_url(blob_url(attachment)), title: "#{champ.libelle} -- #{blob.filename}", data: { src: blob.url }, class: 'gallery-link' do
               .thumbnail
-                = image_tag(attachment.variant(resize_to_limit: [400, 400]).processed.url, loading: :lazy)
+                = image_tag(variant_url_for(attachment), loading: :lazy)
                 .fr-btn.fr-btn--tertiary.fr-btn--icon-left.fr-icon-eye{ role: :button }
                   = 'Visualiser'
           - else