diff --git a/app/src/main/java/eu/faircode/email/FragmentOptionsPrivacy.java b/app/src/main/java/eu/faircode/email/FragmentOptionsPrivacy.java
index f7201d3a96..b763c2c85e 100644
--- a/app/src/main/java/eu/faircode/email/FragmentOptionsPrivacy.java
+++ b/app/src/main/java/eu/faircode/email/FragmentOptionsPrivacy.java
@@ -19,6 +19,7 @@ package eu.faircode.email;
     Copyright 2018-2022 by Marcel Bokhorst (M66B)
 */
 
+import android.app.ActivityManager;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -93,6 +94,7 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
     private SwitchCompat swDisconnectAutoUpdate;
     private SwitchCompat swDisconnectLinks;
     private SwitchCompat swDisconnectImages;
+    private Button btnClearAll;
 
     private Group grpSafeBrowsing;
 
@@ -150,6 +152,7 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
         swDisconnectAutoUpdate = view.findViewById(R.id.swDisconnectAutoUpdate);
         swDisconnectLinks = view.findViewById(R.id.swDisconnectLinks);
         swDisconnectImages = view.findViewById(R.id.swDisconnectImages);
+        btnClearAll = view.findViewById(R.id.btnClearAll);
 
         grpSafeBrowsing = view.findViewById(R.id.grpSafeBrowsing);
 
@@ -437,6 +440,26 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
             }
         });
 
+        btnClearAll.setVisibility(BuildConfig.PLAY_STORE_RELEASE ? View.GONE : View.VISIBLE);
+        btnClearAll.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                new AlertDialog.Builder(getContext())
+                        .setIcon(R.drawable.twotone_dangerous_24)
+                        .setTitle(R.string.title_advanced_clear_all)
+                        .setMessage(R.string.title_advanced_clear_all_remark)
+                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                ActivityManager am = (ActivityManager) getContext().getSystemService(Context.ACTIVITY_SERVICE);
+                                am.clearApplicationUserData();
+                            }
+                        })
+                        .setNegativeButton(android.R.string.cancel, null)
+                        .show();
+            }
+        });
+
         // Initialize
         FragmentDialogTheme.setBackground(getContext(), view, false);
 
diff --git a/app/src/main/res/drawable/twotone_dangerous_24.xml b/app/src/main/res/drawable/twotone_dangerous_24.xml
new file mode 100644
index 0000000000..dadef38b3c
--- /dev/null
+++ b/app/src/main/res/drawable/twotone_dangerous_24.xml
@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M9.1,5L5,9.1v5.8L9.1,19h5.8l4.1,-4.1V9.1L14.9,5H9.1zM16.24,14.83l-1.41,1.41L12,13.41l-2.83,2.83l-1.41,-1.41L10.59,12L7.76,9.17l1.41,-1.41L12,10.59l2.83,-2.83l1.41,1.41L13.41,12L16.24,14.83z"
+      android:strokeAlpha="0.3"
+      android:fillAlpha="0.3"/>
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M15.73,3H8.27L3,8.27v7.46L8.27,21h7.46L21,15.73V8.27L15.73,3zM19,14.9L14.9,19H9.1L5,14.9V9.1L9.1,5h5.8L19,9.1V14.9zM14.83,7.76L12,10.59L9.17,7.76L7.76,9.17L10.59,12l-2.83,2.83l1.41,1.41L12,13.41l2.83,2.83l1.41,-1.41L13.41,12l2.83,-2.83L14.83,7.76z"/>
+</vector>
diff --git a/app/src/main/res/layout/fragment_options_privacy.xml b/app/src/main/res/layout/fragment_options_privacy.xml
index e04cf3f132..c06a9040a0 100644
--- a/app/src/main/res/layout/fragment_options_privacy.xml
+++ b/app/src/main/res/layout/fragment_options_privacy.xml
@@ -634,6 +634,18 @@
                     app:layout_constraintTop_toBottomOf="@+id/swDisconnectLinks"
                     app:switchPadding="12dp" />
 
+                <Button
+                    android:id="@+id/btnClearAll"
+                    style="?android:attr/buttonStyleSmall"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:drawableEnd="@drawable/twotone_dangerous_24"
+                    android:drawablePadding="6dp"
+                    android:text="@string/title_advanced_clear_all"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/swDisconnectImages" />
+
                 <androidx.constraintlayout.widget.Group
                     android:id="@+id/grpSafeBrowsing"
                     android:layout_width="0dp"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1c09673159..a3ae9ccd8a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -636,6 +636,8 @@
     <string name="title_advanced_disconnect_auto_update">Automatically update lists weekly</string>
     <string name="title_advanced_disconnect_links">Use lists to warn about tracking links</string>
     <string name="title_advanced_disconnect_images">Use lists to recognize tracking images</string>
+    <string name="title_advanced_clear_all">Delete all data</string>
+    <string name="title_advanced_clear_all_remark">All app data will be irreversibly deleted!</string>
 
     <string name="title_advanced_sign_default">Sign by default</string>
     <string name="title_advanced_encrypt_default">Encrypt by default</string>