diff --git a/app/controllers/mfa_setup_controller.rb b/app/controllers/mfa_setup_controller.rb
index 9e12a445..1065fcfb 100644
--- a/app/controllers/mfa_setup_controller.rb
+++ b/app/controllers/mfa_setup_controller.rb
@@ -20,7 +20,8 @@ class MfaSetupController < ApplicationController
 
       redirect_to settings_profile_index_path, notice: I18n.t('2fa_has_been_configured')
     else
-      @provision_url = current_user.otp_provisioning_uri(current_user.email, issuer: Wabosign.product_name)
+      @provision_url = current_user.otp_provisioning_uri(current_user.email,
+                                                         issuer: Wabosign.branded_product_name(current_account))
 
       @error_message = I18n.t('code_is_invalid')
 
@@ -49,6 +50,7 @@ class MfaSetupController < ApplicationController
 
     current_user.save!
 
-    @provision_url = current_user.otp_provisioning_uri(current_user.email, issuer: Wabosign.product_name)
+    @provision_url = current_user.otp_provisioning_uri(current_user.email,
+                                                       issuer: Wabosign.branded_product_name(current_account))
   end
 end
diff --git a/app/controllers/personalization_settings_controller.rb b/app/controllers/personalization_settings_controller.rb
index 600e3bbb..86c97cad 100644
--- a/app/controllers/personalization_settings_controller.rb
+++ b/app/controllers/personalization_settings_controller.rb
@@ -2,6 +2,7 @@
 
 class PersonalizationSettingsController < ApplicationController
   ALLOWED_KEYS = [
+    AccountConfig::BRAND_NAME_KEY,
     AccountConfig::FORM_COMPLETED_BUTTON_KEY,
     AccountConfig::SUBMITTER_INVITATION_EMAIL_KEY,
     AccountConfig::SUBMITTER_INVITATION_REMINDER_EMAIL_KEY,
diff --git a/app/controllers/sms_settings_controller.rb b/app/controllers/sms_settings_controller.rb
index 5c6498b8..88acdf00 100644
--- a/app/controllers/sms_settings_controller.rb
+++ b/app/controllers/sms_settings_controller.rb
@@ -29,7 +29,7 @@ class SmsSettingsController < ApplicationController
 
     Sms.send_message(account: current_account,
                      to: to,
-                     text: "Test SMS from #{Wabosign.product_name}.")
+                     text: "Test SMS from #{Wabosign.branded_product_name(current_account)}.")
 
     redirect_to settings_sms_path, notice: "Test SMS dispatched to #{to}."
   rescue Sms::Error => e
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index abc32e6d..658a891c 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -1,7 +1,12 @@
 # frozen_string_literal: true
 
 class ApplicationMailer < ActionMailer::Base
-  default from: "#{Wabosign.product_name} <#{Wabosign::SUPPORT_EMAIL}>"
+  # Lambda is evaluated per-message in mailer context, so @current_account
+  # (set by each mailer action) is available here.
+  default from: lambda {
+    account = instance_variable_defined?(:@current_account) ? @current_account : nil
+    "#{Wabosign.branded_product_name(account)} <#{Wabosign::SUPPORT_EMAIL}>"
+  }
   layout 'mailer'
 
   register_interceptor ActionMailerConfigsInterceptor
diff --git a/app/mailers/user_mailer.rb b/app/mailers/user_mailer.rb
index a2402aa2..6df7c651 100644
--- a/app/mailers/user_mailer.rb
+++ b/app/mailers/user_mailer.rb
@@ -10,7 +10,8 @@ class UserMailer < ApplicationMailer
 
     I18n.with_locale(@current_account.locale) do
       mail(to: @user.friendly_name,
-           subject: I18n.t('you_are_invited_to_product_name', product_name: Wabosign.product_name))
+           subject: I18n.t('you_are_invited_to_product_name',
+                           product_name: Wabosign.branded_product_name(@current_account)))
     end
   end
 end
diff --git a/app/models/account.rb b/app/models/account.rb
index aab90683..eb3959d7 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -66,6 +66,10 @@ class Account < ApplicationRecord
     linked_account_account&.testing?
   end
 
+  def brand_name
+    account_configs.find_by(key: AccountConfig::BRAND_NAME_KEY)&.value.to_s.strip.presence
+  end
+
   def tz_info
     @tz_info ||= TZInfo::Timezone.get(ActiveSupport::TimeZone::MAPPING[timezone] || timezone)
   end
diff --git a/app/models/account_config.rb b/app/models/account_config.rb
index eb4aabd7..c42bfb1e 100644
--- a/app/models/account_config.rb
+++ b/app/models/account_config.rb
@@ -61,6 +61,7 @@ class AccountConfig < ApplicationRecord
   TEMPLATE_CUSTOM_FIELDS_KEY = 'template_custom_fields'
   POLICY_LINKS_KEY = 'policy_links'
   ENABLE_MCP_KEY = 'enable_mcp'
+  BRAND_NAME_KEY = 'brand_name'
 
   EMAIL_VARIABLES = {
     SUBMITTER_INVITATION_EMAIL_KEY => %w[template.name submitter.link account.name].freeze,
diff --git a/app/views/devise/mailer/reset_password_instructions.html.erb b/app/views/devise/mailer/reset_password_instructions.html.erb
index e6e9060c..5163b1aa 100644
--- a/app/views/devise/mailer/reset_password_instructions.html.erb
+++ b/app/views/devise/mailer/reset_password_instructions.html.erb
@@ -5,6 +5,6 @@
 <p><%= t('if_you_didnt_request_this_you_can_ignore_this_email') %></p>
 <p>
   <%= t('thanks') %>,<br>
-  <%= Wabosign.product_name %>
+  <%= Wabosign.branded_product_name(@resource&.account) %>
 </p>
 <% content_for(:remove_attribution, true) %>
diff --git a/app/views/invitations/edit.html.erb b/app/views/invitations/edit.html.erb
index 2f348964..fb3a26f3 100644
--- a/app/views/invitations/edit.html.erb
+++ b/app/views/invitations/edit.html.erb
@@ -1,7 +1,7 @@
 <div class="max-w-xl mx-auto px-2">
   <h1 class="flex text-4xl font-bold items-center justify-center my-8 space-x-2">
     <%= svg_icon('waving_hand', class: 'h-10 w-10') %>
-    <span><%= t('welcome_to_product_name', product_name: Wabosign.product_name) %></span>
+    <span><%= t('welcome_to_product_name', product_name: Wabosign.branded_product_name(current_account)) %></span>
   </h1>
   <%= form_for(resource, as: resource_name, url: invitation_path, html: { method: :put, class: 'space-y-6' }) do |f| %>
     <div class="space-y-2">
diff --git a/app/views/layouts/_head_tags.html.erb b/app/views/layouts/_head_tags.html.erb
index 913af2e9..1f50e55e 100644
--- a/app/views/layouts/_head_tags.html.erb
+++ b/app/views/layouts/_head_tags.html.erb
@@ -1,4 +1,5 @@
+<% brand = Wabosign.branded_product_name(signed_in? ? current_account : nil) %>
 <title>
-  <%= content_for(:html_title) || (signed_in? ? Wabosign.product_name : "#{Wabosign.product_name} | Open Source Document Signing") %>
+  <%= content_for(:html_title) || (signed_in? ? brand : "#{brand} | Open Source Document Signing") %>
 </title>
 <%= render 'shared/meta' %>
diff --git a/app/views/mcp_settings/index.html.erb b/app/views/mcp_settings/index.html.erb
index ca0d50ff..c6000dd0 100644
--- a/app/views/mcp_settings/index.html.erb
+++ b/app/views/mcp_settings/index.html.erb
@@ -33,7 +33,7 @@
           </p>
           <div class="card bg-base-200">
             <div class="card-body p-6">
-              <p class="text-2xl font-semibold"><%= t('connect_to_wabosign_mcp') %></p>
+              <p class="text-2xl font-semibold"><%= t('connect_to_product_name_mcp', product_name: Wabosign.branded_product_name(current_account)) %></p>
               <p class="text-lg"><%= t('add_the_following_to_your_mcp_client_configuration') %>:</p>
               <div class="mockup-code overflow-hidden">
                 <% text = JSON.pretty_generate({ mcpServers: { wabosign: { type: 'http', url: "#{root_url(Wabosign.default_url_options)}mcp", headers: { Authorization: "Bearer #{@mcp_token.token}" } } } }).strip %>
diff --git a/app/views/pages/landing.html.erb b/app/views/pages/landing.html.erb
index 27f0074e..d6dfc532 100644
--- a/app/views/pages/landing.html.erb
+++ b/app/views/pages/landing.html.erb
@@ -5,7 +5,7 @@
         <div class="relative flex flex-col items-center">
           <%= render 'shared/logo', width: '100', height: '100' %>
           <h1 class="text-6xl font-bold mt-4 mb-4">
-            <%= Wabosign.product_name %>
+            <%= Wabosign.branded_product_name %>
           </h1>
           <% if Wabosign.version.present? %>
             <a href="<%= Wabosign::GITHUB_URL %>/releases" target="_blank" class="badge badge-outline badge-lg block mx-auto">
diff --git a/app/views/personalization_settings/_brand_name_form.html.erb b/app/views/personalization_settings/_brand_name_form.html.erb
new file mode 100644
index 00000000..f65a8e7d
--- /dev/null
+++ b/app/views/personalization_settings/_brand_name_form.html.erb
@@ -0,0 +1,18 @@
+<%= form_with url: settings_personalization_path, method: :post,
+              html: { class: 'space-y-3', autocomplete: 'off' } do %>
+  <input type="hidden" name="account_config[key]" value="<%= AccountConfig::BRAND_NAME_KEY %>">
+  <div class="form-control">
+    <label class="label" for="brand_name">
+      <span class="label-text">Replace "<%= Wabosign::PRODUCT_NAME %>" in the UI, emails, audit-trail PDFs, and authenticator-app issuer with your own product name. Leave blank to fall back to the default.</span>
+    </label>
+    <input type="text" name="account_config[value]" id="brand_name"
+           value="<%= current_account.brand_name %>"
+           maxlength="60" placeholder="e.g. Acme Sign"
+           autocomplete="off"
+           class="base-input">
+  </div>
+  <button type="submit" class="base-button">Save</button>
+<% end %>
+<p class="text-sm opacity-70 mt-2">
+  The <a href="<%= Wabosign::UPSTREAM_URL %>" class="link" target="_blank" rel="noopener"><%= Wabosign::UPSTREAM_NAME %></a> upstream attribution required by AGPL §7(b) stays visible in the footer, post-signing screen, and email footers regardless of this setting.
+</p>
diff --git a/app/views/personalization_settings/show.html.erb b/app/views/personalization_settings/show.html.erb
index f4ba1639..2618526f 100644
--- a/app/views/personalization_settings/show.html.erb
+++ b/app/views/personalization_settings/show.html.erb
@@ -10,6 +10,10 @@
       <%= render 'submitter_completed_email_form' %>
       <%= render 'signature_request_sms_form' %>
     </div>
+    <p class="text-4xl font-bold mb-4 mt-8">
+      Product name
+    </p>
+    <%= render 'brand_name_form' %>
     <p class="text-4xl font-bold mb-4 mt-8">
       <%= t('company_logo') %>
     </p>
diff --git a/app/views/pwa/manifest.json.erb b/app/views/pwa/manifest.json.erb
index 18aafb96..3211fd12 100644
--- a/app/views/pwa/manifest.json.erb
+++ b/app/views/pwa/manifest.json.erb
@@ -1,6 +1,7 @@
+<% brand = Wabosign.branded_product_name %>
 {
-  "name": "<%= Wabosign.product_name %>",
-  "short_name": "<%= Wabosign.product_name %>",
+  "name": "<%= brand %>",
+  "short_name": "<%= brand %>",
   "id": "/",
   "icons": [
     {
@@ -18,7 +19,7 @@
   "display": "standalone",
   "scope": "/",
   "orientation": "any",
-  "description": "<%= Wabosign.product_name %> is an open source platform that provides secure and efficient digital document signing and processing.",
+  "description": "<%= brand %> is an open source platform that provides secure and efficient digital document signing and processing.",
   "categories": ["productivity", "utilities"],
   "theme_color": "#FAF7F4",
   "background_color": "#FAF7F4"
diff --git a/app/views/shared/_attribution.html.erb b/app/views/shared/_attribution.html.erb
index bc464bba..9a006d55 100644
--- a/app/views/shared/_attribution.html.erb
+++ b/app/views/shared/_attribution.html.erb
@@ -1 +1 @@
-<%= render 'shared/powered_by', with_counter: local_assigns[:with_counter], link_path: local_assigns[:link_path] %>
+<%= render 'shared/powered_by', with_counter: local_assigns[:with_counter], link_path: local_assigns[:link_path], account: local_assigns[:account] %>
diff --git a/app/views/shared/_email_attribution.html.erb b/app/views/shared/_email_attribution.html.erb
index 23788a1c..401246a0 100644
--- a/app/views/shared/_email_attribution.html.erb
+++ b/app/views/shared/_email_attribution.html.erb
@@ -1,13 +1,15 @@
 <p>
   ---
 </p>
+<% brand = Wabosign.branded_product_name(@current_account) %>
 <p>
   <% if @current_account&.testing? %>
-    <%= t('sent_using_product_name_in_testing_mode_html', product_url: "#{Wabosign::PRODUCT_EMAIL_URL}/start", product_name: Wabosign.product_name) %>
+    <%= t('sent_using_product_name_in_testing_mode_html', product_url: "#{Wabosign::PRODUCT_EMAIL_URL}/start", product_name: brand) %>
   <% else %>
-    <%= t('sent_using_product_name_free_document_signing_html', product_url: "#{Wabosign::PRODUCT_EMAIL_URL}/start", product_name: Wabosign.product_name) %>
+    <%= t('sent_using_product_name_free_document_signing_html', product_url: "#{Wabosign::PRODUCT_EMAIL_URL}/start", product_name: brand) %>
   <% end %>
 </p>
+<%# AGPL §7(b) DocuSeal attribution. Do not remove or rebrand. %>
 <p style="font-size: 11px; opacity: 0.7;">
   <%= t('based_on') %>
   <a href="<%= Wabosign::UPSTREAM_URL %>"><%= Wabosign::UPSTREAM_NAME %></a>
diff --git a/app/views/shared/_meta.html.erb b/app/views/shared/_meta.html.erb
index 00f49b18..edab477b 100644
--- a/app/views/shared/_meta.html.erb
+++ b/app/views/shared/_meta.html.erb
@@ -1,14 +1,15 @@
 <% if Wabosign.demo? || (request.path != '/' && !devise_controller?) %>
   <meta name="robots" content="noindex">
 <% end %>
-<% title = content_for(:html_title) || (signed_in? ? Wabosign.product_name : "#{Wabosign.product_name} | Open Source Document Signing") %>
+<% brand = Wabosign.branded_product_name(signed_in? ? current_account : nil) %>
+<% title = content_for(:html_title) || (signed_in? ? brand : "#{brand} | Open Source Document Signing") %>
 <% description = content_for(:html_description) || 'Open source, self-hosted tool to streamline document filling and signing. Create custom PDF forms to complete and sign with an easy to use online tool.' %>
 <meta name="description" content="<%= description %>">
 <meta property="og:title" content="<%= title %>">
 <meta property="og:description" content="<%= description %>">
 <meta property="og:type" content="website">
 <meta property="og:url" content="<%= root_url %>">
-<meta property="og:site_name" content="<%= Wabosign.product_name %>">
+<meta property="og:site_name" content="<%= brand %>">
 <% if content_for(:disable_image_preview) %>
   <meta property="og:image" content="">
   <meta name="twitter:image" content="">
diff --git a/app/views/shared/_powered_by.html.erb b/app/views/shared/_powered_by.html.erb
index 90b151b2..113c4030 100644
--- a/app/views/shared/_powered_by.html.erb
+++ b/app/views/shared/_powered_by.html.erb
@@ -9,8 +9,9 @@
   <% else %>
     <%= t('powered_by') %>
   <% end %>
-  <a href="<%= Wabosign::PRODUCT_URL %><%= local_assigns[:link_path] %>" class="underline"><%= Wabosign.product_name %></a> - <%= t('open_source_documents_software') %>
+  <a href="<%= Wabosign::PRODUCT_URL %><%= local_assigns[:link_path] %>" class="underline"><%= Wabosign.branded_product_name(local_assigns[:account]) %></a> - <%= t('open_source_documents_software') %>
 </div>
+<%# AGPL §7(b) DocuSeal attribution. Do not remove or rebrand. %>
 <div class="text-center px-2 text-xs opacity-70 mt-1">
   <%= t('based_on') %>
   <a href="<%= Wabosign::UPSTREAM_URL %>" class="underline" target="_blank" rel="noopener"><%= Wabosign::UPSTREAM_NAME %></a>
diff --git a/app/views/shared/_title.html.erb b/app/views/shared/_title.html.erb
index c5e7b611..8b3969af 100644
--- a/app/views/shared/_title.html.erb
+++ b/app/views/shared/_title.html.erb
@@ -1,2 +1,2 @@
 <%= render 'shared/account_logo', account: current_account %>
-<span><%= Wabosign.product_name %></span>
+<span><%= Wabosign.branded_product_name(current_account) %></span>
diff --git a/app/views/start_form/_brand_logo.html.erb b/app/views/start_form/_brand_logo.html.erb
index 04dbb467..fcc0672d 100644
--- a/app/views/start_form/_brand_logo.html.erb
+++ b/app/views/start_form/_brand_logo.html.erb
@@ -2,5 +2,5 @@
   <span class="mr-3">
     <%= render 'shared/account_logo', account: @template&.account, width: '50px', height: '50px' %>
   </span>
-  <h1 class="text-5xl font-bold text-center"><%= Wabosign.product_name %></h1>
+  <h1 class="text-5xl font-bold text-center"><%= Wabosign.branded_product_name(@template&.account) %></h1>
 </a>
diff --git a/app/views/start_form/email_verification.html.erb b/app/views/start_form/email_verification.html.erb
index 91b25ca1..6e4b29f6 100644
--- a/app/views/start_form/email_verification.html.erb
+++ b/app/views/start_form/email_verification.html.erb
@@ -1,4 +1,4 @@
-<% content_for(:html_title, "#{@template.name} | #{Wabosign.product_name}") %>
+<% content_for(:html_title, "#{@template.name} | #{Wabosign.branded_product_name(@template.account)}") %>
 <% I18n.with_locale(@template.account.locale) do %>
   <% content_for(:html_description, t('account_name_has_invited_you_to_fill_and_sign_documents_online_effortlessly_with_a_secure_fast_and_user_friendly_digital_document_signing_solution', account_name: @template.account.name)) %>
 <% end %>
diff --git a/app/views/start_form/private.html.erb b/app/views/start_form/private.html.erb
index f8610bf2..cdc1e738 100644
--- a/app/views/start_form/private.html.erb
+++ b/app/views/start_form/private.html.erb
@@ -1,4 +1,4 @@
-<% content_for(:html_title, "#{@template.name} | #{Wabosign.product_name}") %>
+<% content_for(:html_title, "#{@template.name} | #{Wabosign.branded_product_name(@template.account)}") %>
 <% I18n.with_locale(@template.account.locale) do %>
   <% content_for(:html_description, t('share_link_is_currently_disabled')) %>
 <% end %>
diff --git a/app/views/start_form/show.html.erb b/app/views/start_form/show.html.erb
index 34911190..d81d0c37 100644
--- a/app/views/start_form/show.html.erb
+++ b/app/views/start_form/show.html.erb
@@ -1,4 +1,4 @@
-<% content_for(:html_title, "#{@template.name} | #{Wabosign.product_name}") %>
+<% content_for(:html_title, "#{@template.name} | #{Wabosign.branded_product_name(@template.account)}") %>
 <% I18n.with_locale(@template.account.locale) do %>
   <% content_for(:html_description, t('account_name_has_invited_you_to_fill_and_sign_documents_online_effortlessly_with_a_secure_fast_and_user_friendly_digital_document_signing_solution', account_name: @template.account.name)) %>
 <% end %>
diff --git a/app/views/submit_form/_brand_logo.html.erb b/app/views/submit_form/_brand_logo.html.erb
index ce58f268..ff23e5c9 100644
--- a/app/views/submit_form/_brand_logo.html.erb
+++ b/app/views/submit_form/_brand_logo.html.erb
@@ -1,4 +1,4 @@
 <a href="<%= root_path %>" class="mx-auto text-2xl md:text-3xl font-bold items-center flex space-x-3">
   <%= render 'shared/account_logo', account: @submitter&.submission&.account, class: 'w-9 h-9 md:w-12 md:h-12' %>
-  <span><%= Wabosign.product_name %></span>
+  <span><%= Wabosign.branded_product_name(@submitter&.submission&.account) %></span>
 </a>
diff --git a/app/views/submit_form/email_2fa.html.erb b/app/views/submit_form/email_2fa.html.erb
index 62584cc7..4033d354 100644
--- a/app/views/submit_form/email_2fa.html.erb
+++ b/app/views/submit_form/email_2fa.html.erb
@@ -1,4 +1,4 @@
-<% content_for(:html_title, "#{@submitter.submission.name || @submitter.submission.template.name} | #{Wabosign.product_name}") %>
+<% content_for(:html_title, "#{@submitter.submission.name || @submitter.submission.template.name} | #{Wabosign.branded_product_name(@submitter.account)}") %>
 <% I18n.with_locale(@submitter.account.locale) do %>
   <% content_for(:html_description, t('account_name_has_invited_you_to_fill_and_sign_documents_online_effortlessly_with_a_secure_fast_and_user_friendly_digital_document_signing_solution', account_name: @submitter.account.name)) %>
 <% end %>
diff --git a/app/views/submit_form/show.html.erb b/app/views/submit_form/show.html.erb
index 898e2393..a4ae78d4 100644
--- a/app/views/submit_form/show.html.erb
+++ b/app/views/submit_form/show.html.erb
@@ -1,4 +1,4 @@
-<% content_for(:html_title, "#{@submitter.submission.name || @submitter.submission.template.name} | #{Wabosign.product_name}") %>
+<% content_for(:html_title, "#{@submitter.submission.name || @submitter.submission.template.name} | #{Wabosign.branded_product_name(@submitter.account)}") %>
 <% I18n.with_locale(@submitter.account.locale) do %>
   <% content_for(:html_description, t('account_name_has_invited_you_to_fill_and_sign_documents_online_effortlessly_with_a_secure_fast_and_user_friendly_digital_document_signing_solution', account_name: @submitter.account.name)) %>
 <% end %>
diff --git a/app/views/templates_dashboard/index.html.erb b/app/views/templates_dashboard/index.html.erb
index 0a6432db..931937e7 100644
--- a/app/views/templates_dashboard/index.html.erb
+++ b/app/views/templates_dashboard/index.html.erb
@@ -65,7 +65,7 @@
             <% if user_config.new_record? && !params.key?(:tour) %>
               <div id="app_tour_manager" class="h-36 rounded-2xl pt-3 px-7 w-full border border-dashed border-base-300">
                 <div class="text-xl text-center font-semibold text-base-content">
-                  <%= t('welcome_to_wabosign') %>
+                  <%= t('welcome_to_product_name', product_name: Wabosign.branded_product_name(current_account)) %>
                 </div>
                 <div class="my-2 text-center text-xs text-base-content/70">
                   <%= t('start_a_quick_tour_to_learn_how_to_create_and_send_your_first_document') %>
diff --git a/app/views/templates_share_link_qr/_branding.html.erb b/app/views/templates_share_link_qr/_branding.html.erb
index 4377ca34..389b7eff 100644
--- a/app/views/templates_share_link_qr/_branding.html.erb
+++ b/app/views/templates_share_link_qr/_branding.html.erb
@@ -1,2 +1,2 @@
 <%= t('powered_by') %>
-<a href="<%= Wabosign::PRODUCT_URL %>" target="_blank" rel="noopener"><%= Wabosign.product_name %></a>
+<a href="<%= Wabosign::PRODUCT_URL %>" target="_blank" rel="noopener"><%= Wabosign.branded_product_name(@template&.account) %></a>
diff --git a/app/views/templates_share_link_qr/_logo.html.erb b/app/views/templates_share_link_qr/_logo.html.erb
index 6ad9ee61..277a6afd 100644
--- a/app/views/templates_share_link_qr/_logo.html.erb
+++ b/app/views/templates_share_link_qr/_logo.html.erb
@@ -1,2 +1,2 @@
 <%= render 'shared/account_logo', account: @template&.account %>
-<span><%= Wabosign.product_name %></span>
+<span><%= Wabosign.branded_product_name(@template&.account) %></span>
diff --git a/app/views/user_mailer/invitation_email.html.erb b/app/views/user_mailer/invitation_email.html.erb
index bb3392ff..d8243b93 100644
--- a/app/views/user_mailer/invitation_email.html.erb
+++ b/app/views/user_mailer/invitation_email.html.erb
@@ -1,5 +1,5 @@
 <p><%= @user.first_name.present? ? t('hello_name', name: @user.first_name) : t('hi_there') %>,</p>
-<p><%= t('you_have_been_invited_to_account_name_product_name_please_sign_up_using_the_link_below_', account_name: @user.account.name, product_name: Wabosign.product_name) %></p>
+<p><%= t('you_have_been_invited_to_account_name_product_name_please_sign_up_using_the_link_below_', account_name: @user.account.name, product_name: Wabosign.branded_product_name(@current_account)) %></p>
 <p><%= link_to t('sign_up'), invitation_url(reset_password_token: @token) %></p>
 <p><%= t('please_contact_us_by_replying_to_this_email_if_you_have_any_questions') %></p>
 <p>
diff --git a/config/locales/i18n.yml b/config/locales/i18n.yml
index 3e3a3175..a36d497a 100644
--- a/config/locales/i18n.yml
+++ b/config/locales/i18n.yml
@@ -929,7 +929,7 @@ en: &en
   mcp_token_has_been_removed: MCP token has been removed.
   enable_mcp_server: Enable MCP server
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: All existing MCP connections will be stopped immediately when this setting is disabled.
-  connect_to_wabosign_mcp: Connect to WaboSign MCP
+  connect_to_product_name_mcp: Connect to %{product_name} MCP
   add_the_following_to_your_mcp_client_configuration: Add the following to your MCP client configuration
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Works with Claude Desktop, Cursor, Windsurf, VS Code, and any MCP-compatible client.
   your_email_address_has_been_changed: Your email address has been changed
@@ -1977,7 +1977,7 @@ es: &es
   mcp_token_has_been_removed: El token MCP ha sido eliminado.
   enable_mcp_server: Habilitar servidor MCP
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: Todas las conexiones MCP existentes se detendrán inmediatamente cuando se desactive esta configuración.
-  connect_to_wabosign_mcp: Conectar a WaboSign MCP
+  connect_to_product_name_mcp: Conectar a %{product_name} MCP
   add_the_following_to_your_mcp_client_configuration: Agregue lo siguiente a la configuración de su cliente MCP
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Funciona con Claude Desktop, Cursor, Windsurf, VS Code y cualquier cliente compatible con MCP.
   your_email_address_has_been_changed: Tu dirección de correo electrónico ha sido cambiada
@@ -3025,7 +3025,7 @@ it: &it
   mcp_token_has_been_removed: Il token MCP è stato rimosso.
   enable_mcp_server: Abilita server MCP
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: Tutte le connessioni MCP esistenti verranno interrotte immediatamente quando questa impostazione viene disattivata.
-  connect_to_wabosign_mcp: Connetti a WaboSign MCP
+  connect_to_product_name_mcp: Connetti a %{product_name} MCP
   add_the_following_to_your_mcp_client_configuration: Aggiungi quanto segue alla configurazione del tuo client MCP
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Funziona con Claude Desktop, Cursor, Windsurf, VS Code e qualsiasi client compatibile con MCP.
   your_email_address_has_been_changed: Il tuo indirizzo email è stato modificato
@@ -4070,7 +4070,7 @@ fr: &fr
   mcp_token_has_been_removed: Le jeton MCP a été supprimé.
   enable_mcp_server: Activer le serveur MCP
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: Toutes les connexions MCP existantes seront arrêtées immédiatement lorsque ce paramètre est désactivé.
-  connect_to_wabosign_mcp: Se connecter à WaboSign MCP
+  connect_to_product_name_mcp: Se connecter à %{product_name} MCP
   add_the_following_to_your_mcp_client_configuration: Ajoutez ce qui suit à la configuration de votre client MCP
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Fonctionne avec Claude Desktop, Cursor, Windsurf, VS Code et tout client compatible MCP.
   your_email_address_has_been_changed: Votre adresse e-mail a été modifiée
@@ -5118,7 +5118,7 @@ pt: &pt
   mcp_token_has_been_removed: O token MCP foi removido.
   enable_mcp_server: Ativar servidor MCP
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: Todas as conexões MCP existentes serão interrompidas imediatamente quando esta configuração for desativada.
-  connect_to_wabosign_mcp: Conectar ao WaboSign MCP
+  connect_to_product_name_mcp: Conectar ao %{product_name} MCP
   add_the_following_to_your_mcp_client_configuration: Adicione o seguinte à configuração do seu cliente MCP
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Funciona com Claude Desktop, Cursor, Windsurf, VS Code e qualquer cliente compatível com MCP.
   your_email_address_has_been_changed: Seu endereço de e-mail foi alterado
@@ -6166,7 +6166,7 @@ de: &de
   mcp_token_has_been_removed: Das MCP-Token wurde entfernt.
   enable_mcp_server: MCP-Server aktivieren
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: Alle bestehenden MCP-Verbindungen werden sofort gestoppt, wenn diese Einstellung deaktiviert wird.
-  connect_to_wabosign_mcp: Mit WaboSign MCP verbinden
+  connect_to_product_name_mcp: Mit %{product_name} MCP verbinden
   add_the_following_to_your_mcp_client_configuration: Fügen Sie Folgendes zu Ihrer MCP-Client-Konfiguration hinzu
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Funktioniert mit Claude Desktop, Cursor, Windsurf, VS Code und jedem MCP-kompatiblen Client.
   your_email_address_has_been_changed: Ihre E-Mail-Adresse wurde geändert
@@ -7623,7 +7623,7 @@ nl: &nl
   mcp_token_has_been_removed: Het MCP-token is verwijderd.
   enable_mcp_server: MCP-server inschakelen
   all_existing_mcp_connections_will_be_stopped_immediately_when_this_setting_is_disabled: Alle bestaande MCP-verbindingen worden onmiddellijk gestopt wanneer deze instelling wordt uitgeschakeld.
-  connect_to_wabosign_mcp: Verbinden met WaboSign MCP
+  connect_to_product_name_mcp: Verbinden met %{product_name} MCP
   add_the_following_to_your_mcp_client_configuration: Voeg het volgende toe aan uw MCP-clientconfiguratie
   works_with_claude_desktop_cursor_windsurf_vs_code_and_any_mcp_compatible_client: Werkt met Claude Desktop, Cursor, Windsurf, VS Code en elke MCP-compatibele client.
   your_email_address_has_been_changed: Uw e-mailadres is gewijzigd
diff --git a/lib/mcp/handle_request.rb b/lib/mcp/handle_request.rb
index 70fd628c..3a7b66c9 100644
--- a/lib/mcp/handle_request.rb
+++ b/lib/mcp/handle_request.rb
@@ -26,7 +26,7 @@ module Mcp
           result: {
             protocolVersion: '2025-11-25',
             serverInfo: {
-              name: Wabosign.product_name,
+              name: Wabosign.branded_product_name(current_user&.account),
               version: Wabosign.version.to_s
             },
             capabilities: {
diff --git a/lib/submissions/generate_audit_trail.rb b/lib/submissions/generate_audit_trail.rb
index 1671ccec..a87eafa7 100644
--- a/lib/submissions/generate_audit_trail.rb
+++ b/lib/submissions/generate_audit_trail.rb
@@ -43,11 +43,11 @@ module Submissions
 
         io = StringIO.new
 
-        document.trailer.info[:Creator] = "#{Wabosign.product_name} (#{Wabosign::PRODUCT_URL})"
+        document.trailer.info[:Creator] = "#{Wabosign.branded_product_name(account)} (#{Wabosign::PRODUCT_URL})"
 
         if pkcs
           sign_params = {
-            reason: sign_reason,
+            reason: sign_reason(account),
             **Submissions::GenerateResultAttachments.build_signing_params(last_submitter, pkcs, tsa_url)
           }
 
@@ -510,8 +510,8 @@ module Submissions
       composer.document
     end
 
-    def sign_reason
-      "Signed with #{Wabosign.product_name}"
+    def sign_reason(account = nil)
+      "Signed with #{Wabosign.branded_product_name(account)}"
     end
 
     def select_attachments(submitter)
@@ -534,7 +534,7 @@ module Submissions
       column.image(PdfIcons.account_logo_io(submission&.account),
                    width: 40, height: 40, position: :float)
 
-      column.formatted_text([{ text: Wabosign.product_name,
+      column.formatted_text([{ text: Wabosign.branded_product_name(submission&.account),
                                link: Wabosign::PRODUCT_EMAIL_URL }],
                             font_size: 20,
                             font: [FONT_NAME, { variant: :bold }],
diff --git a/lib/submissions/generate_combined_attachment.rb b/lib/submissions/generate_combined_attachment.rb
index 3320e2b6..9b728211 100644
--- a/lib/submissions/generate_combined_attachment.rb
+++ b/lib/submissions/generate_combined_attachment.rb
@@ -15,7 +15,7 @@ module Submissions
 
       io = StringIO.new
 
-      pdf.trailer.info[:Creator] = "#{Wabosign.product_name} (#{Wabosign::PRODUCT_URL})"
+      pdf.trailer.info[:Creator] = "#{Wabosign.branded_product_name(account)} (#{Wabosign::PRODUCT_URL})"
 
       if Wabosign.pdf_format == 'pdf/a-3b'
         pdf.task(:pdfa, level: '3b')
diff --git a/lib/submissions/generate_result_attachments.rb b/lib/submissions/generate_result_attachments.rb
index c4d24a1d..9e9d3c68 100644
--- a/lib/submissions/generate_result_attachments.rb
+++ b/lib/submissions/generate_result_attachments.rb
@@ -37,7 +37,11 @@ module Submissions
       bold_italic: FONT_BOLD_NAME
     }.freeze
 
-    SIGN_REASON = "Signed with #{Wabosign.product_name}".freeze
+    # PDF signature "reason" template. Per-account branded — the actual
+    # template is computed by `sign_reason_template(account)` below; this
+    # constant is the format placeholder. Historically the format kwarg
+    # `name:` was unused.
+    SIGN_REASON_FORMAT = 'Signed with %<brand>s'
 
     RTL_REGEXP = TextUtils::RTL_REGEXP
 
@@ -728,7 +732,7 @@ module Submissions
     def build_pdf_attachment(pdf:, submitter:, pkcs:, tsa_url:, uuid:, name:)
       io = StringIO.new
 
-      pdf.trailer.info[:Creator] = info_creator
+      pdf.trailer.info[:Creator] = info_creator(submitter&.account)
 
       if Wabosign.pdf_format == 'pdf/a-3b'
         pdf.task(:pdfa, level: '3b')
@@ -970,14 +974,14 @@ module Submissions
       HexaPDF::Document.new(io:)
     end
 
-    def sign_reason(name)
-      format(SIGN_REASON, name:)
+    def sign_reason(_name, account: nil)
+      format(SIGN_REASON_FORMAT, brand: Wabosign.branded_product_name(account))
     end
 
     def single_sign_reason(submitter)
-      signers = submitter.submission.submitters.sort_by(&:completed_at).map { |s| s.email || s.name || s.phone }
+      submitter.submission.submitters.sort_by(&:completed_at).map { |s| s.email || s.name || s.phone }
 
-      format(SIGN_REASON, name: signers.reverse.join(', '))
+      format(SIGN_REASON_FORMAT, brand: Wabosign.branded_product_name(submitter&.account))
     end
 
     def fetch_sign_reason(submitter)
@@ -992,7 +996,7 @@ module Submissions
                        .first_or_initialize(value: 'single')
         end
 
-      return sign_reason(reason_name) if config.value == 'multiple'
+      return sign_reason(reason_name, account: submitter.account) if config.value == 'multiple'
 
       if !submitter.submission.submitters.exists?(completed_at: nil) &&
          submitter.completed_at == submitter.submission.submitters.maximum(:completed_at)
@@ -1002,8 +1006,8 @@ module Submissions
       nil
     end
 
-    def info_creator
-      "#{Wabosign.product_name} (#{Wabosign::PRODUCT_URL})"
+    def info_creator(account = nil)
+      "#{Wabosign.branded_product_name(account)} (#{Wabosign::PRODUCT_URL})"
     end
 
     def detached_signature?(_submitter)
diff --git a/lib/wabosign.rb b/lib/wabosign.rb
index f85aa47f..4730f803 100644
--- a/lib/wabosign.rb
+++ b/lib/wabosign.rb
@@ -98,6 +98,29 @@ module Wabosign
     PRODUCT_NAME
   end
 
+  # Returns the account's custom brand name (if set), the deployment's
+  # default-account brand (for anonymous surfaces like the landing page,
+  # PWA manifest, or og:title), or PRODUCT_NAME as the ultimate fallback.
+  # Never overrides Wabosign::UPSTREAM_NAME — the AGPL §7(b) DocuSeal
+  # credit in _powered_by, _email_attribution, and completed.vue stays
+  # untouched.
+  def branded_product_name(account = nil)
+    account&.brand_name.presence ||
+      default_brand_account&.brand_name.presence ||
+      PRODUCT_NAME
+  end
+
+  # The deployment-wide fallback account whose brand name is used for
+  # anonymous surfaces (no current_account in scope). Single-tenant
+  # installs have exactly one account; multi-tenant picks the oldest.
+  # Not memoized: the underlying query is fast and memoization would
+  # need cache invalidation on every personalization save.
+  def default_brand_account
+    Account.where(archived_at: nil).order(:created_at).first
+  rescue ActiveRecord::StatementInvalid, ActiveRecord::ConnectionNotEstablished
+    nil
+  end
+
   def refresh_default_url_options!
     @default_url_options = nil
   end
diff --git a/spec/lib/wabosign_spec.rb b/spec/lib/wabosign_spec.rb
new file mode 100644
index 00000000..ceef2c71
--- /dev/null
+++ b/spec/lib/wabosign_spec.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Wabosign do
+  describe '.branded_product_name' do
+    context 'with no accounts in the database' do
+      before { Account.delete_all }
+
+      it 'falls back to the PRODUCT_NAME constant' do
+        expect(described_class.branded_product_name).to eq(Wabosign::PRODUCT_NAME)
+        expect(described_class.branded_product_name(nil)).to eq(Wabosign::PRODUCT_NAME)
+      end
+    end
+
+    context 'when the passed-in account has a brand_name configured' do
+      let(:account) do
+        create(:account).tap do |a|
+          a.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Acme Sign')
+        end
+      end
+
+      it 'returns the account brand' do
+        expect(described_class.branded_product_name(account)).to eq('Acme Sign')
+      end
+
+      it 'returns the account brand even when newer accounts also have brands' do
+        newer = create(:account)
+        newer.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Other Brand')
+        expect(described_class.branded_product_name(account)).to eq('Acme Sign')
+      end
+    end
+
+    context 'when no account is passed but the oldest account has a brand' do
+      it 'uses the default-account fallback' do
+        create(:account).account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Default Brand')
+        create(:account) # newer, no brand
+        expect(described_class.branded_product_name).to eq('Default Brand')
+        expect(described_class.branded_product_name(nil)).to eq('Default Brand')
+      end
+    end
+
+    context 'when the passed-in account has no brand but the default account does' do
+      it 'still uses the default-account fallback' do
+        create(:account).account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Default Brand')
+        other = create(:account)
+        expect(described_class.branded_product_name(other)).to eq('Default Brand')
+      end
+    end
+
+    context 'when an archived account is the oldest' do
+      it 'is skipped when looking up the default brand' do
+        archived = create(:account, archived_at: Time.current)
+        archived.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Archived Brand')
+
+        live = create(:account)
+        live.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Live Brand')
+
+        expect(described_class.branded_product_name).to eq('Live Brand')
+      end
+    end
+  end
+
+  describe '.default_brand_account' do
+    it 'returns the oldest non-archived account' do
+      first = create(:account)
+      _second = create(:account)
+      expect(described_class.default_brand_account).to eq(first)
+    end
+
+    it 'skips archived accounts' do
+      _archived = create(:account, archived_at: Time.current)
+      live = create(:account)
+      expect(described_class.default_brand_account).to eq(live)
+    end
+  end
+end
diff --git a/spec/models/account_spec.rb b/spec/models/account_spec.rb
new file mode 100644
index 00000000..00fe692e
--- /dev/null
+++ b/spec/models/account_spec.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Account do
+  describe '#brand_name' do
+    let(:account) { create(:account) }
+
+    it 'returns nil when no brand_name AccountConfig is set' do
+      expect(account.brand_name).to be_nil
+    end
+
+    it 'returns the configured value' do
+      account.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Acme Sign')
+      expect(account.brand_name).to eq('Acme Sign')
+    end
+
+    it 'strips surrounding whitespace from non-blank values' do
+      account.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: '  Acme Sign  ')
+      expect(account.brand_name).to eq('Acme Sign')
+    end
+  end
+end
diff --git a/spec/requests/personalization_settings_spec.rb b/spec/requests/personalization_settings_spec.rb
new file mode 100644
index 00000000..42873352
--- /dev/null
+++ b/spec/requests/personalization_settings_spec.rb
@@ -0,0 +1,77 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Personalization settings: brand name', type: :request do
+  let!(:account) { create(:account) }
+  let!(:admin)   { create(:user, account: account, role: User::ADMIN_ROLE, email: 'admin@wabo.cc') }
+
+  before { sign_in admin }
+
+  describe 'GET /settings/personalization' do
+    it 'renders the brand-name input with the current value' do
+      account.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Acme Sign')
+
+      get settings_personalization_path
+
+      expect(response).to have_http_status(:ok)
+      expect(response.body).to include('value="Acme Sign"')
+    end
+
+    it 'renders an empty brand-name input when none is set' do
+      get settings_personalization_path
+
+      expect(response).to have_http_status(:ok)
+      expect(response.body).to include('id="brand_name"')
+    end
+  end
+
+  describe 'POST /settings/personalization with brand_name' do
+    it 'saves the brand name and redirects back' do
+      post settings_personalization_path, params: {
+        account_config: { key: AccountConfig::BRAND_NAME_KEY, value: 'Acme Sign' }
+      }
+
+      expect(response).to redirect_to(settings_personalization_path)
+      expect(account.reload.brand_name).to eq('Acme Sign')
+    end
+
+    it 'clears the brand name when posted blank' do
+      account.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Acme Sign')
+
+      post settings_personalization_path, params: {
+        account_config: { key: AccountConfig::BRAND_NAME_KEY, value: '' }
+      }
+
+      expect(response).to redirect_to(settings_personalization_path)
+      expect(account.reload.brand_name).to be_nil
+    end
+
+    it 'rejects an unknown key' do
+      # Production renders 500 on this; in test env the exception propagates.
+      expect do
+        post settings_personalization_path, params: {
+          account_config: { key: 'definitely_not_allowed', value: 'anything' }
+        }
+      end.to raise_error(PersonalizationSettingsController::InvalidKey)
+
+      expect(AccountConfig.where(account: account, key: 'definitely_not_allowed')).not_to exist
+    end
+  end
+
+  describe 'branded navbar' do
+    it 'reflects the saved brand name in the rendered chrome' do
+      account.account_configs.create!(key: AccountConfig::BRAND_NAME_KEY, value: 'Acme Sign')
+
+      get root_path
+
+      expect(response.body).to include('Acme Sign')
+    end
+
+    it 'shows the default brand when no override is set' do
+      get root_path
+
+      expect(response.body).to include(Wabosign::PRODUCT_NAME)
+    end
+  end
+end