diff --git a/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetMainCredentialDialogFragment.kt b/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetMainCredentialDialogFragment.kt
index 9a28fd940..0efb572c7 100644
--- a/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetMainCredentialDialogFragment.kt
+++ b/app/src/main/java/com/kunzisoft/keepass/activities/dialogs/SetMainCredentialDialogFragment.kt
@@ -159,9 +159,7 @@ class SetMainCredentialDialogFragment : DatabaseDialogFragment() {
                         keyFileSelectionView.error = null
                         keyFileCheckBox.isChecked = true
                         keyFileSelectionView.uri = pathUri
-                        if (lengthFile <= 0L) {
-                            showEmptyKeyFileConfirmationDialog()
-                        }
+                        showLengthKeyFileConfirmationDialog(lengthFile)
                     }
                 }
             }
@@ -339,21 +337,31 @@ class SetMainCredentialDialogFragment : DatabaseDialogFragment() {
         }
     }
 
-    private fun showEmptyKeyFileConfirmationDialog() {
+    private fun showLengthKeyFileConfirmationDialog(length: Long) {
         activity?.let {
             val builder = AlertDialog.Builder(it)
             builder.setMessage(SpannableStringBuilder().apply {
-                append(getString(R.string.warning_empty_keyfile))
-                append("\n\n")
                 append(getString(R.string.warning_empty_keyfile_explanation))
-                append("\n\n")
-                append(getString(R.string.warning_sure_add_file))
-                })
-                    .setPositiveButton(android.R.string.ok) { _, _ -> }
-                    .setNegativeButton(android.R.string.cancel) { _, _ ->
-                        keyFileCheckBox.isChecked = false
-                        keyFileSelectionView.uri = null
-                    }
+                var warning = false
+                if (length <= 0L) {
+                    warning = true
+                    append("\n\n")
+                    append(getString(R.string.warning_empty_keyfile))
+                } else if (length > 10485760L) {
+                    warning = true
+                    append("\n\n")
+                    append(getString(R.string.warning_large_keyfile))
+                }
+                if (warning) {
+                    append("\n\n")
+                    append(getString(R.string.warning_sure_add_file))
+                }
+            })
+                .setPositiveButton(android.R.string.ok) { _, _ -> }
+                .setNegativeButton(android.R.string.cancel) { _, _ ->
+                    keyFileCheckBox.isChecked = false
+                    keyFileSelectionView.uri = null
+                }
             mEmptyKeyFileConfirmationDialog = builder.create()
             mEmptyKeyFileConfirmationDialog?.show()
         }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 73da0df2a..ce7563d7d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -373,6 +373,7 @@
     <string name="warning_remove_unlinked_attachment">Removing unlinked data may decrease the size of your database but may also delete data used for KeePass plugins.</string>
     <string name="warning_sure_remove_data">Remove this data anyway?</string>
     <string name="warning_empty_keyfile">It is not recommended to add an empty keyfile.</string>
+    <string name="warning_large_keyfile">It is not recommended to add a large keyfile, this may prevent the database from opening.</string>
     <string name="warning_empty_keyfile_explanation">The content of the keyfile should never be changed, and in the best case, should contain randomly generated data.</string>
     <string name="warning_database_info_changed">The information contained in your database file has been modified outside the app.</string>
     <string name="warning_database_info_changed_options">Merge the data, overwrite the external modifications by saving the database or reload it with the latest changes.</string>