diff --git a/defaults/main.yml b/defaults/main.yml
index bd94170..ccd160c 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -36,6 +36,50 @@ nextcloud_customized_container_src_path: "{{ nextcloud_base_path }}/customized-c
 nextcloud_container_image_customizations_php_imageick_installation_enabled: false
 nextcloud_container_image_customizations_php_imageick_installation_package: "libmagickcore-6.q16-6-extra"
 
+# Preview generator setup
+#
+# Enable the variable nextcloud_preview_enabled and you are good to go.
+#
+# Some important aspects of usage:
+# - the preview generator has two stages [according to their readme](https://github.com/nextcloud/previewgenerator)
+#   - a generate-all phase, which has to be executed only a single time
+#   - a pre-generate phase, that should be run in a cronjob.
+#     That runs quite fast if the generate-all phase finishd.
+# We do not want to run the generate-all phase multiple times, so its execution has to be followed somehow.
+# This is done by creating a file on the host side and both the task that executes generate-all
+# and both the cronjob checks its existance.
+#
+# Multiple vaiables are also defined and the corresponding default values are also set.
+# These values are based on the [upstream readme](https://github.com/nextcloud/previewgenerator) and also on experience.
+# Feel free to change anything.
+#
+# Once installed, the playbook needs to be called with the adjust-nextcloud-config tag.
+# This tag sets up the variables and calls the generate-all script, that will also create the file---signalling
+# its finished state---on the host.
+# *** As this may take a long time, be sure to only call it when you have time to leave it running!!! ***
+# The playbook calls generate-all asynchronously, but it will timeout after about 27h.
+# On 60GBs, most if images, it took about 10 minutes to finish.
+# If it takes more time, you may want to start it from the host by calling
+# ```sh
+# /usr/bin/env docker exec mash-nextcloud-server php /var/www/html/occ preview:generate-all
+# ```
+#
+# If the nextcloud_preview_enabled value is set back to false, the host side files are cleaned up
+# and also the cron job is changed, not to call prevew generation again however, the database and generated
+# previews are kept intact.
+nextcloud_preview_enabled: false
+nextcloud_preview_folder_name: "preview-generator"
+nextcloud_preview_docker_folder: "/{{ nextcloud_preview_folder_name }}"
+nextcloud_preview_host_folder: "{{ nextcloud_customized_container_src_path }}/{{ nextcloud_preview_folder_name }}"
+nextcloud_preview_first_run_finished_filename: "finished-first-run.keepit"
+nextcloud_preview_squareSizes: "\"64 256 1024 2048\""
+nextcloud_preview_widthSizes: "\"64 256 1024 2048\""
+nextcloud_preview_heightSizes: "\"64 256 1024 2048\""
+nextcloud_preview_preview_max_x: 2048
+nextcloud_preview_preview_max_y: 2048
+nextcloud_preview_system_jpeg_quality: 60
+nextcloud_preview_app_jpeg_quality: "60"
+
 # nextcloud_container_image_customizations_enabled controls whether a customized Nextcloud image will be built.
 #
 # We toggle this variable to `true` when certain features which require a custom build are enabled.
diff --git a/tasks/adjust_config.yml b/tasks/adjust_config.yml
index bfa1286..fdbd196 100644
--- a/tasks/adjust_config.yml
+++ b/tasks/adjust_config.yml
@@ -33,3 +33,60 @@
   ansible.builtin.command:
     cmd: |-
       docker exec --user={{ nextcloud_uid }}:{{ nextcloud_gid }} {{ nextcloud_identifier }}-server php /var/www/html/occ db:add-missing-indices
+
+- when: nextcloud_preview_enabled | bool
+  block:
+    - name: Adjust Nextcloud configuration values related to preview generator
+      ansible.builtin.command:
+          cmd: |-
+            docker exec --user={{ nextcloud_uid }}:{{ nextcloud_gid }} {{ nextcloud_identifier }}-server php /var/www/html/occ {{ item.appType }} {{ item.appConfig }} {{ item.configName }}  --value={{ item.value }}
+      with_items:
+        - appType: "config:app:set"
+          appConfig: "previewgenerator"
+          configName: "squareSizes"
+          value: "{{ nextcloud_preview_squareSizes }}"
+        - appType: "config:app:set"
+          appConfig: "previewgenerator"
+          configName: "widthSizes"
+          value: "{{ nextcloud_preview_widthSizes }}"
+        - appType: "config:app:set"
+          appConfig: "previewgenerator"
+          configName: "heightSizes"
+          value: "{{ nextcloud_preview_heightSizes }}"
+        - appType: "config:system:set"
+          appConfig: ""
+          configName: "preview_max_x"
+          value: "{{ nextcloud_preview_preview_max_x }}"
+        - appType: "config:system:set"
+          appConfig: ""
+          configName: "preview_max_y"
+          value: "{{ nextcloud_preview_preview_max_y }}"
+        - appType: "config:system:set"
+          appConfig: ""
+          configName: "jpeg_quality"
+          value: "{{ nextcloud_preview_system_jpeg_quality }}"
+        - appType: "config:app:set"
+          appConfig: "preview"
+          configName: "jpeg_quality"
+          value: "{{ nextcloud_preview_app_jpeg_quality }}"
+
+    - name: "Check if {{ nextcloud_preview_first_run_finished_filename }} exists"
+      ansible.builtin.stat:
+          path: "{{ nextcloud_preview_host_folder }}/{{ nextcloud_preview_first_run_finished_filename }}"
+      register: nextcloud_preview_file_stats
+
+    - when: not nextcloud_preview_file_stats.stat.exists
+      name: Start preview generate-all
+      ansible.builtin.command:
+          cmd: |-
+            docker exec --user={{ nextcloud_uid }}:{{ nextcloud_gid }} {{ nextcloud_identifier }}-server php /var/www/html/occ preview:generate-all
+      async: 100000
+      poll: 10
+
+    - name: "Create {{ nextcloud_preview_first_run_finished_filename } to signal, that preview generate-all is finished"
+      ansible.builtin.file:
+          path: "{{ nextcloud_preview_host_folder }}/{{ nextcloud_preview_first_run_finished_filename }}"
+          state: "touch"
+          mode: 0644
+          owner: "{{ nextcloud_uid }}"
+          group: "{{ nextcloud_gid }}"
diff --git a/tasks/install.yml b/tasks/install.yml
index 45b40bb..b98e001 100644
--- a/tasks/install.yml
+++ b/tasks/install.yml
@@ -23,6 +23,9 @@
     - path: "{{ nextcloud_redis_session_ini_path }}"
       state: "{{ 'touch' if nextcloud_redis_is_configured else 'absent' }}"
       when: true
+    - path: "{{ nextcloud_preview_host_folder }}"
+      state: "{{ 'directory' if nextcloud_preview_enabled else 'absent' }}"
+      when: true
   when: item.when | bool
 
 - name: Ensure Nextcloud support files installed
@@ -34,6 +37,15 @@
     - env
     - labels
 
+- when: "nextcloud_preview_enabled | bool"
+  name: Ensure Nextcloud preview generator files are present
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/preview-generator/{{ item }}.j2"
+    dest: "{{ nextcloud_preview_host_folder }}/{{ item }}"
+    mode: 0740
+  with_items:
+    - preview-generator-cron.sh
+
 - name: Ensure Nextcloud container image is pulled
   community.docker.docker_image:
     name: "{{ nextcloud_container_image }}"
diff --git a/templates/preview-generator/preview-generator-cron.sh.j2 b/templates/preview-generator/preview-generator-cron.sh.j2
new file mode 100644
index 0000000..a9f3be6
--- /dev/null
+++ b/templates/preview-generator/preview-generator-cron.sh.j2
@@ -0,0 +1,9 @@
+#! /usr/bin/env bash
+
+if [ -f {{ nextcloud_preview_host_folder }}/{{ nextcloud_preview_first_run_finished_filename }} ]
+then
+	echo "Preview scan is finished, regeneration starts"
+	docker exec --user={{ nextcloud_uid }}:{{ nextcloud_gid }} {{ nextcloud_identifier }}-server php /var/www/html/occ preview:pre-generate
+else
+	echo "Preview scan hasn't finished, regeneration skipped"
+fi
diff --git a/templates/systemd/cron.service.j2 b/templates/systemd/cron.service.j2
index 2e17bdb..b1b45a5 100644
--- a/templates/systemd/cron.service.j2
+++ b/templates/systemd/cron.service.j2
@@ -4,3 +4,6 @@ Description=Runs the cronjobs For Nextcloud ({{ nextcloud_identifier }})
 [Service]
 Type=oneshot
 ExecStart={{ devture_systemd_docker_base_host_command_docker }} exec {{ nextcloud_identifier }}-server php /var/www/html/cron.php
+{% if nextcloud_preview_enabled %}
+ExecStart={{ nextcloud_preview_host_folder }}/preview-generator-cron.sh
+{% endif %}