diff --git a/app/controllers/users/description_controller.rb b/app/controllers/users/description_controller.rb
index ac5abf6ab..f83751f33 100644
--- a/app/controllers/users/description_controller.rb
+++ b/app/controllers/users/description_controller.rb
@@ -100,7 +100,13 @@ class Users::DescriptionController < UsersController
   private
 
   def redirect_to_description_with_errors(dossier, errors)
-    flash.alert = errors
+    errors_to_display = if errors.count > 3
+      errors.take(3) + ['...']
+    else
+      errors
+    end
+
+    flash.alert = errors_to_display
     redirect_to users_dossier_description_path(dossier_id: dossier.id)
   end
 
diff --git a/app/services/champs_service.rb b/app/services/champs_service.rb
index 40c46a993..62a1d7342 100644
--- a/app/services/champs_service.rb
+++ b/app/services/champs_service.rb
@@ -8,7 +8,7 @@ class ChampsService
 
     def build_error_messages(champs)
       champs.select(&:mandatory_and_blank?)
-            .map { |c| "Le champ #{c.libelle} doit être rempli." }
+        .map { |c| "Le champ #{c.libelle.truncate(200)} doit être rempli." }
     end
 
     private
diff --git a/app/services/pieces_justificatives_service.rb b/app/services/pieces_justificatives_service.rb
index 8003e3c92..106526e06 100644
--- a/app/services/pieces_justificatives_service.rb
+++ b/app/services/pieces_justificatives_service.rb
@@ -38,7 +38,7 @@ class PiecesJustificativesService
                                 type_de_piece_justificative: tpj,
                                 user: user)
 
-    pj.save ? nil : "le fichier #{content.original_filename} (#{pj.libelle}) n'a pas pu être sauvegardé"
+    pj.save ? nil : "le fichier #{content.original_filename} (#{pj.libelle.truncate(200)}) n'a pas pu être sauvegardé"
   end
 
   def self.missing_pj_error_messages(dossier)
@@ -46,6 +46,6 @@ class PiecesJustificativesService
     present_pjs = dossier.pieces_justificatives.map(&:type_de_piece_justificative)
     missing_pjs = mandatory_pjs - present_pjs
 
-    missing_pjs.map { |pj| "La pièce jointe #{pj.libelle} doit être fournie." }
+    missing_pjs.map { |pj| "La pièce jointe #{pj.libelle.truncate(200)} doit être fournie." }
   end
 end