diff --git a/app/models/attestation_template.rb b/app/models/attestation_template.rb
index 9bac00521..9c2b5ad49 100644
--- a/app/models/attestation_template.rb
+++ b/app/models/attestation_template.rb
@@ -7,6 +7,7 @@ class AttestationTemplate < ApplicationRecord
   mount_uploader :signature, AttestationTemplateImageUploader
 
   validate :logo_signature_file_size
+  validates :footer, length: { maximum: 190 }
 
   FILE_MAX_SIZE_IN_MB = 0.5
 
diff --git a/app/views/admin/attestation_templates/edit.html.haml b/app/views/admin/attestation_templates/edit.html.haml
index 5c50f5023..9b54d4def 100644
--- a/app/views/admin/attestation_templates/edit.html.haml
+++ b/app/views/admin/attestation_templates/edit.html.haml
@@ -58,8 +58,7 @@
 
     .form-group
       = f.label :footer, 'Adresse en bas de page'
-      ~ f.text_area :footer, class: 'form-control', rows: 2,
-        placeholder: "Direction interministérielle du numérique et du système d'information et de communication de l'Etat (DINSIC)"
+      = f.text_field :footer, class: 'form-control', maxlength: 190
 
     %button.btn.btn-primary{ formaction: admin_procedure_attestation_template_preview_path, formtarget: '_blank' } Prévisualiser
 
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index f1da0acaa..b94806305 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -87,6 +87,10 @@ fr:
   activerecord:
     errors:
       models:
+        attestation_template:
+          attributes:
+            footer:
+              too_long: ": l'adresse en bas de page est trop longue."
         piece_justificative:
           attributes:
             content:
diff --git a/spec/models/attestation_template_spec.rb b/spec/models/attestation_template_spec.rb
index a9d5e5191..95270dbb9 100644
--- a/spec/models/attestation_template_spec.rb
+++ b/spec/models/attestation_template_spec.rb
@@ -40,6 +40,21 @@ describe AttestationTemplate, type: :model do
     end
   end
 
+  describe 'validates footer length' do
+    let(:attestation_template) { AttestationTemplate.new(footer: footer) }
+
+    subject do
+      attestation_template.validate
+      attestation_template.errors.details
+    end
+
+    context 'when the footer is too long' do
+      let(:footer) { 'a' * 191 }
+
+      it { is_expected.to match({ footer: [{ error: :too_long, count: 190 }] }) }
+    end
+  end
+
   describe 'dup' do
     before do
       @logo = File.open('spec/fixtures/white.png')