diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 138c57bb6..f5f859032 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,6 +1,8 @@
 module ApplicationHelper
   APP_HOST = ENV['APP_HOST']
   APP_HOST_LEGACY = ENV['APP_HOST_LEGACY']
+  REGEXP_REPLACE_TRAILING_EXTENSION = /(\.\w+)+$/.freeze
+  REGEXP_REPLACE_WORD_SEPARATOR = /[\s_-]+/.freeze
 
   def app_host_legacy?(request)
     return false if APP_HOST_LEGACY.blank?
@@ -145,4 +147,11 @@ module ApplicationHelper
     tag.span(class: class_names(classes, 'fr-icon--sm': sm, 'fr-mr-1v': mr),
              "aria-hidden" => true)
   end
+
+  def acronymize(str)
+    str.gsub(REGEXP_REPLACE_TRAILING_EXTENSION, '')
+      .split(REGEXP_REPLACE_WORD_SEPARATOR)
+      .map { |word| word[0].upcase }
+      .join
+  end
 end
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index dc3998c9b..524fc6faf 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -112,4 +112,29 @@ describe ApplicationHelper do
       it { is_expected.to eq("") }
     end
   end
+  describe '#acronymize' do
+    it 'returns the acronym of a given string' do
+      expect(helper.acronymize('Application Name')).to eq('AN')
+      expect(helper.acronymize('Hello World')).to eq('HW')
+      expect(helper.acronymize('Demarches Simplifiees')).to eq('DS')
+    end
+
+    it 'handles single word input' do
+      expect(helper.acronymize('Word')).to eq('W')
+    end
+
+    it 'returns an empty string for empty input' do
+      expect(helper.acronymize('')).to eq('')
+    end
+
+    it 'handles strings with extensions' do
+      expect(helper.acronymize('file_name.txt')).to eq('FN')
+      expect(helper.acronymize('example.pdf')).to eq('E')
+    end
+
+    it 'handles strings with various word separators' do
+      expect(helper.acronymize('multi-word_string')).to eq('MWS')
+      expect(helper.acronymize('another_example-test')).to eq('AET')
+    end
+  end
 end