diff --git a/src/identity/local/login.dto.ts b/src/identity/local/login.dto.ts
new file mode 100644
index 000000000..290c52456
--- /dev/null
+++ b/src/identity/local/login.dto.ts
@@ -0,0 +1,13 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { IsString } from 'class-validator';
+
+export class LoginDto {
+  @IsString()
+  username: string;
+  @IsString()
+  password: string;
+}
diff --git a/src/identity/local/register.dto.ts b/src/identity/local/register.dto.ts
new file mode 100644
index 000000000..0c2a9e6c1
--- /dev/null
+++ b/src/identity/local/register.dto.ts
@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { IsString } from 'class-validator';
+
+export class RegisterDto {
+  @IsString()
+  username: string;
+
+  @IsString()
+  displayname: string;
+
+  @IsString()
+  password: string;
+}
diff --git a/src/identity/local/update-password.dto.ts b/src/identity/local/update-password.dto.ts
new file mode 100644
index 000000000..bfe473b32
--- /dev/null
+++ b/src/identity/local/update-password.dto.ts
@@ -0,0 +1,11 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { IsString } from 'class-validator';
+
+export class UpdatePasswordDto {
+  @IsString()
+  newPassword: string;
+}