diff --git a/auth/lib/onboarding/view/common/add_tag.dart b/auth/lib/onboarding/view/common/add_tag.dart
index 3fb42071e..716515ad4 100644
--- a/auth/lib/onboarding/view/common/add_tag.dart
+++ b/auth/lib/onboarding/view/common/add_tag.dart
@@ -27,6 +27,7 @@ class _AddTagDialogState extends State<AddTagDialog> {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             TextFormField(
+              maxLength: 100,
               decoration: InputDecoration(
                 hintText: l10n.tag,
                 hintStyle: const TextStyle(
diff --git a/auth/lib/onboarding/view/common/edit_tag.dart b/auth/lib/onboarding/view/common/edit_tag.dart
index fe1f38564..3885312d2 100644
--- a/auth/lib/onboarding/view/common/edit_tag.dart
+++ b/auth/lib/onboarding/view/common/edit_tag.dart
@@ -29,6 +29,7 @@ class _EditTagDialogState extends State<EditTagDialog> {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             TextFormField(
+              maxLength: 100,
               decoration: InputDecoration(
                 hintText: l10n.tag,
                 hintStyle: const TextStyle(