diff --git a/app/controllers/concerns/query_params_store_concern.rb b/app/controllers/concerns/query_params_store_concern.rb
deleted file mode 100644
index f8584e7f4..000000000
--- a/app/controllers/concerns/query_params_store_concern.rb
+++ /dev/null
@@ -1,31 +0,0 @@
-module QueryParamsStoreConcern
-  extend ActiveSupport::Concern
-
-  included do
-    helper_method :stored_query_params?
-  end
-
-  def store_query_params
-    # Don't override already stored params, because we could do goings and comings with authentication, and
-    # lost previously stored params
-    return if stored_query_params? || filtered_query_params.empty?
-
-    session[:stored_params] = filtered_query_params.to_json
-  end
-
-  def retrieve_and_delete_stored_query_params
-    return {} unless stored_query_params?
-
-    JSON.parse(session.delete(:stored_params))
-  end
-
-  def stored_query_params?
-    session[:stored_params].present?
-  end
-
-  private
-
-  def filtered_query_params
-    request.query_parameters.except(:locale, "locale")
-  end
-end
diff --git a/app/controllers/users/commencer_controller.rb b/app/controllers/users/commencer_controller.rb
index f8fa38aed..14021f009 100644
--- a/app/controllers/users/commencer_controller.rb
+++ b/app/controllers/users/commencer_controller.rb
@@ -1,7 +1,5 @@
 module Users
   class CommencerController < ApplicationController
-    include QueryParamsStoreConcern
-
     layout 'procedure_context'
 
     before_action :retrieve_prefilled_dossier,        if: -> { params[:prefill_token].present? },                only: :commencer
@@ -12,8 +10,6 @@ module Users
       @procedure = retrieve_procedure
       return procedure_not_found if @procedure.blank? || @procedure.brouillon?
 
-      store_query_params
-
       @revision = @procedure.published_revision
       render 'commencer/show'
     end
@@ -26,6 +22,22 @@ module Users
       render 'commencer/show'
     end
 
+    def preremplir
+      @procedure = retrieve_procedure
+      dossier = Dossier.new(
+        revision: @procedure.active_revision,
+        groupe_instructeur: @procedure.defaut_groupe_instructeur_for_new_dossier,
+        state: Dossier.states.fetch(:brouillon),
+        prefilled: true
+      )
+      dossier.build_default_individual
+      if dossier.save
+        dossier.prefill!(PrefillParams.new(dossier, params.to_unsafe_h).to_a)
+      end
+
+      redirect_to commencer_url(@procedure.path, prefill_token: dossier.prefill_token)
+    end
+
     def dossier_vide_pdf
       @procedure = retrieve_procedure_with_closed
       return procedure_not_found if @procedure.blank? || @procedure.brouillon?
diff --git a/app/controllers/users/dossiers_controller.rb b/app/controllers/users/dossiers_controller.rb
index 4e2791be8..e7337ea66 100644
--- a/app/controllers/users/dossiers_controller.rb
+++ b/app/controllers/users/dossiers_controller.rb
@@ -1,7 +1,6 @@
 module Users
   class DossiersController < UserController
     include DossierHelper
-    include QueryParamsStoreConcern
 
     layout 'procedure_context', only: [:identite, :update_identite, :siret, :update_siret]
 
@@ -295,7 +294,7 @@ module Users
       )
       dossier.build_default_individual
       dossier.save!
-      dossier.prefill!(PrefillParams.new(dossier, retrieve_and_delete_stored_query_params).to_a)
+      dossier.prefill!(PrefillParams.new(dossier, params.to_unsafe_h).to_a)
       DossierMailer.with(dossier:).notify_new_draft.deliver_later
 
       if dossier.procedure.for_individual
diff --git a/app/models/prefill_description.rb b/app/models/prefill_description.rb
index 2148b3dce..57c47e6c9 100644
--- a/app/models/prefill_description.rb
+++ b/app/models/prefill_description.rb
@@ -27,7 +27,7 @@ class PrefillDescription < SimpleDelegator
   end
 
   def prefill_link
-    @prefill_link ||= commencer_url({ path: path }.merge(prefilled_champs_for_link))
+    @prefill_link ||= commencer_preremplissage_url({ path: path }.merge(prefilled_champs_for_link))
   end
 
   def prefill_query
diff --git a/app/views/commencer/show.html.haml b/app/views/commencer/show.html.haml
index d15e5cf6d..ae3487dd5 100644
--- a/app/views/commencer/show.html.haml
+++ b/app/views/commencer/show.html.haml
@@ -21,11 +21,6 @@
       %p= t('views.commencer.show.prefilled_draft_detail_html', time_ago: time_ago_in_words(@prefilled_dossier.created_at), procedure: @procedure.libelle)
       = link_to t('views.commencer.show.go_to_prefilled_file'), brouillon_dossier_path(@prefilled_dossier), class: 'fr-btn fr-btn--lg fr-my-2w'
 
-    - elsif stored_query_params?
-      %h2.huge-title= t('views.commencer.show.prefilled_draft')
-      %p= t('views.commencer.show.prefill_dossier_detail_html', procedure: @procedure.libelle)
-      = link_to t('views.commencer.show.go_to_prefilled_file'), url_for_new_dossier(@revision), class: 'fr-btn fr-btn--lg fr-my-2w'
-
     - elsif dossiers.empty?
       = link_to t('views.commencer.show.start_procedure'), url_for_new_dossier(@revision), class: 'fr-btn fr-btn--lg fr-my-2w'
 
diff --git a/config/routes.rb b/config/routes.rb
index e295e8179..b62f27119 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -295,6 +295,7 @@ Rails.application.routes.draw do
       get '/test/:path/dossier_vide', action: :dossier_vide_pdf_test, as: :dossier_vide_test
       get '/test/:path', action: 'commencer_test', as: :test
       get '/:path', action: 'commencer'
+      get '/preremplir/:path', action: 'preremplir', as: :preremplissage
       get '/:path/dossier_vide', action: 'dossier_vide_pdf', as: :dossier_vide
       get '/:path/sign_in', action: 'sign_in', as: :sign_in
       get '/:path/sign_up', action: 'sign_up', as: :sign_up
diff --git a/spec/controllers/concerns/query_params_store_concern_spec.rb b/spec/controllers/concerns/query_params_store_concern_spec.rb
deleted file mode 100644
index 42b29177f..000000000
--- a/spec/controllers/concerns/query_params_store_concern_spec.rb
+++ /dev/null
@@ -1,91 +0,0 @@
-RSpec.describe QueryParamsStoreConcern, type: :controller do
-  class TestController < ActionController::Base
-    include QueryParamsStoreConcern
-  end
-
-  controller TestController do
-  end
-
-  before { allow_any_instance_of(ActionDispatch::Request).to receive(:query_parameters).and_return(params) }
-
-  describe '#store_query_params' do
-    subject(:store_query_params) { controller.store_query_params }
-
-    context 'when params are already stored' do
-      let(:params) { { param1: "param1" } }
-
-      it "does nothing" do
-        session[:stored_params] = "there is already something in there"
-
-        expect { store_query_params }.not_to change { session[:stored_params] }
-      end
-    end
-
-    context 'when params are empty' do
-      let(:params) { {} }
-
-      it "does nothing" do
-        expect { store_query_params }.not_to change { session[:stored_params] }
-      end
-    end
-
-    context 'when the store is empty and we have params' do
-      let(:params) { { param1: "param1", param2: "param2" } }
-
-      it "stores the query params" do
-        expect { store_query_params }.to change { session[:stored_params] }.from(nil).to(params.to_json)
-      end
-    end
-
-    context 'when params contain a locale' do
-      let(:params) { { locale: "fr", param2: "param2" } }
-
-      it "does not store the locale" do
-        expect { store_query_params }.to change { session[:stored_params] }.from(nil).to({ param2: "param2" }.to_json)
-      end
-    end
-  end
-
-  describe '#retrieve_and_delete_stored_query_params' do
-    subject(:retrieve_and_delete_stored_query_params) { controller.retrieve_and_delete_stored_query_params }
-
-    context 'when there are no stored params' do
-      let(:params) { {} }
-
-      it 'returns an empty hash' do
-        expect(retrieve_and_delete_stored_query_params).to be_empty
-      end
-    end
-
-    context 'when params are stored' do
-      let(:params) { { param1: "param1", param2: "param2" } }
-
-      before { controller.store_query_params }
-
-      it 'deletes the stored params' do
-        expect { retrieve_and_delete_stored_query_params }.to change { session[:stored_params] }.to(nil)
-      end
-
-      it 'returns the stored params' do
-        expect(retrieve_and_delete_stored_query_params).to match(params.with_indifferent_access)
-      end
-    end
-  end
-
-  describe '#stored_query_params?' do
-    subject(:stored_query_params?) { controller.stored_query_params? }
-
-    before { controller.store_query_params }
-    context 'when query params have been stored' do
-      let(:params) { { param1: "param1", param2: "param2" } }
-
-      it { is_expected.to eq(true) }
-    end
-
-    context 'when query params have not been stored' do
-      let(:params) { {} }
-
-      it { is_expected.to eq(false) }
-    end
-  end
-end