diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81a7e0cb..4326eeb6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ In order to move participant stats to the event table for existing events, you n
 - Add a different welcome message when coming from registration
 - Link to participation page from event page when you are an organizer
 - Added a warning on login that everything is deleted regularily
+- Added a demo mode to show or hide instance warnings that data is deleted
 - Updated Occitan translations (Quentin)
 - Updated French translations (Gavy, Zilverspar, ty kayn)
 - Updated Swedish translations (Anton Strömkvist)
diff --git a/config/config.exs b/config/config.exs
index 9682b34c..8899ceae 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -18,6 +18,7 @@ config :mobilizon, :instance,
   version: "1.0.0-dev",
   hostname: System.get_env("MOBILIZON_INSTANCE_HOST") || "localhost",
   registrations_open: System.get_env("MOBILIZON_INSTANCE_REGISTRATIONS_OPEN") || false,
+  demo: System.get_env("MOBILIZON_INSTANCE_DEMO_MODE") || false,
   repository: Mix.Project.config()[:source_url],
   allow_relay: true,
   # Federation is to be activated with Mobilizon 1.0.0-beta.2
diff --git a/js/src/App.vue b/js/src/App.vue
index 6bdc00e8..f8d4db62 100644
--- a/js/src/App.vue
+++ b/js/src/App.vue
@@ -1,7 +1,7 @@
 <template>
   <div id="mobilizon">
     <NavBar />
-    <div class="container">
+    <div class="container" v-if="config && config.demoMode">
       <b-message type="is-danger" :title="$t('Warning').toLocaleUpperCase()" closable aria-close-label="Close">
         <p>{{ $t('This is a demonstration site to test the beta version of Mobilizon.') }}</p>
         <p v-html="$t('<b>Please do not use it in any real way</b>: everything you create here (accounts, events, identities, etc.) will be automatically deleted every 48 hours.')" />
@@ -35,11 +35,14 @@ import { CURRENT_USER_CLIENT, UPDATE_CURRENT_USER_CLIENT } from '@/graphql/user'
 import Footer from '@/components/Footer.vue';
 import Logo from '@/components/Logo.vue';
 import { initializeCurrentActor } from '@/utils/auth';
+import { CONFIG } from '@/graphql/config';
+import { IConfig } from '@/types/config.model';
 @Component({
   apollo: {
     currentUser: {
       query: CURRENT_USER_CLIENT,
     },
+    config: CONFIG,
   },
   components: {
     Logo,
@@ -48,6 +51,8 @@ import { initializeCurrentActor } from '@/utils/auth';
   },
 })
 export default class App extends Vue {
+  config!: IConfig;
+
   async created() {
     if (await this.initializeCurrentUser()) {
       await initializeCurrentActor(this.$apollo.provider.defaultClient);
diff --git a/js/src/graphql/config.ts b/js/src/graphql/config.ts
index 8cc814f1..8b424ea3 100644
--- a/js/src/graphql/config.ts
+++ b/js/src/graphql/config.ts
@@ -6,6 +6,7 @@ query {
     name,
     description,
     registrationsOpen,
+    demoMode,
     countryCode,
     location {
       latitude,
diff --git a/js/src/types/config.model.ts b/js/src/types/config.model.ts
index d1294246..01afee08 100644
--- a/js/src/types/config.model.ts
+++ b/js/src/types/config.model.ts
@@ -3,6 +3,7 @@ export interface IConfig {
   description: string;
 
   registrationsOpen: boolean;
+  demoMode: boolean;
   countryCode: string;
   location: {
     latitude: number;
diff --git a/js/src/views/User/Login.vue b/js/src/views/User/Login.vue
index 6c05e603..d2a601cb 100644
--- a/js/src/views/User/Login.vue
+++ b/js/src/views/User/Login.vue
@@ -24,7 +24,7 @@
               {{ $t('No user account with this email was found. Maybe you made a typo?') }}
             </span>
             <!-- Warning that we delete everything every now and then -->
-            <span v-if="error === LoginError.USER_DOES_NOT_EXIST">
+            <span v-if="error === LoginError.USER_DOES_NOT_EXIST && config.demoMode">
               {{ $t('User accounts and every other data is currently deleted every 48 hours, so you may want to register again.') }}
             </span>
           </b-message>
@@ -203,4 +203,4 @@ export default class Login extends Vue {
   .container .columns {
     margin: 1rem auto 3rem;
   }
-</style>
\ No newline at end of file
+</style>
diff --git a/lib/mobilizon/config.ex b/lib/mobilizon/config.ex
index c7f8b572..26d3e7ff 100644
--- a/lib/mobilizon/config.ex
+++ b/lib/mobilizon/config.ex
@@ -21,6 +21,9 @@ defmodule Mobilizon.Config do
   @spec instance_registrations_open? :: boolean
   def instance_registrations_open?, do: to_boolean(instance_config()[:registrations_open])
 
+  @spec instance_demo_mode? :: boolean
+  def instance_demo_mode?, do: to_boolean(instance_config()[:demo])
+
   @spec instance_repository :: String.t()
   def instance_repository, do: instance_config()[:repository]
 
diff --git a/lib/mobilizon_web/resolvers/config.ex b/lib/mobilizon_web/resolvers/config.ex
index 4ba2d9a5..3c1e40bc 100644
--- a/lib/mobilizon_web/resolvers/config.ex
+++ b/lib/mobilizon_web/resolvers/config.ex
@@ -30,6 +30,7 @@ defmodule MobilizonWeb.Resolvers.Config do
      %{
        name: Config.instance_name(),
        registrations_open: Config.instance_registrations_open?(),
+       demo_mode: Config.instance_demo_mode?(),
        description: Config.instance_description(),
        location: location,
        country_code: country_code,
diff --git a/lib/mobilizon_web/schema/config.ex b/lib/mobilizon_web/schema/config.ex
index b286ce3f..91f9a97d 100644
--- a/lib/mobilizon_web/schema/config.ex
+++ b/lib/mobilizon_web/schema/config.ex
@@ -13,6 +13,7 @@ defmodule MobilizonWeb.Schema.ConfigType do
     field(:description, :string)
 
     field(:registrations_open, :boolean)
+    field(:demo_mode, :boolean)
     field(:country_code, :string)
     field(:location, :lonlat)
     field(:geocoding, :geocoding)
diff --git a/lib/mobilizon_web/templates/email/email.html.eex b/lib/mobilizon_web/templates/email/email.html.eex
index e9be1071..ace25ce3 100644
--- a/lib/mobilizon_web/templates/email/email.html.eex
+++ b/lib/mobilizon_web/templates/email/email.html.eex
@@ -72,6 +72,7 @@
         </td>
     </tr>
     <%= render @view_module, @view_template, assigns %>
+    <% if Mobilizon.Config.instance_demo_mode?() do %>
     <!-- BETA WARNING -->
         <tr>
             <td bgcolor="#f4f4f4" align="center" style="padding: 30px 10px 0px 10px;">
@@ -103,6 +104,7 @@
                 <![endif]-->
             </td>
         </tr>
+    <% end %>
     <!-- SUPPORT CALLOUT -->
         <tr>
             <td bgcolor="#f4f4f4" align="center" style="padding: 30px 10px 0px 10px;">
diff --git a/schema.graphql b/schema.graphql
index d64e2d3f..e3150036 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -1,5 +1,5 @@
 # source: http://localhost:4000/api
-# timestamp: Wed Nov 20 2019 10:45:54 GMT+0100 (Central European Standard Time)
+# timestamp: Thu Nov 21 2019 15:58:08 GMT+0100 (Central European Standard Time)
 
 schema {
   query: RootQueryType
@@ -190,6 +190,7 @@ enum CommentVisibility {
 """A config object"""
 type Config {
   countryCode: String
+  demoMode: Boolean
   description: String
   geocoding: Geocoding
   location: Lonlat