diff --git a/docs/changelog.md b/docs/changelog.md
index 1ce975ee63..31b68c37c6 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -13,6 +13,11 @@ Critical security updates are indicated by the :warning: icon.
 	- Disable vibrations
 	- Don't show gaps between posts in timelines
 	- Show the instance ticker on local posts
+- Change default user settings (existing users are not affected)
+	- Reject crawler indexing
+	- Set reaction history to public
+- Change default server settings (existing servers are not affected)
+	- Disable new user registration
 
 ## v20240229
 
diff --git a/docs/downgrade.sql b/docs/downgrade.sql
index 245844c074..8a7769dcb9 100644
--- a/docs/downgrade.sql
+++ b/docs/downgrade.sql
@@ -1,6 +1,7 @@
 BEGIN;
 
 DELETE FROM "migrations" WHERE name IN (
+    'ChangeDefaultConfigs1709251460718',
     'AddReplyMuting1704851359889',
     'FixNoteUrlIndex1709129810501',
     'RemoveCharts1709047957489',
@@ -11,6 +12,11 @@ DELETE FROM "migrations" WHERE name IN (
     'RemoveNativeUtilsMigration1705877093218'
 );
 
+-- change-default-configs
+ALTER TABLE "user_profile" ALTER COLUMN "noCrawle" SET DEFAULT false;
+ALTER TABLE "user_profile" ALTER COLUMN "publicReactions" SET DEFAULT false;
+ALTER TABLE "meta" ALTER COLUMN "disableRegistration" SET DEFAULT false;
+
 -- reply-muting
 DROP TABLE "reply_muting";
 
diff --git a/packages/backend/migration/1709251460718-change-default-configs.js b/packages/backend/migration/1709251460718-change-default-configs.js
new file mode 100644
index 0000000000..8c50e482be
--- /dev/null
+++ b/packages/backend/migration/1709251460718-change-default-configs.js
@@ -0,0 +1,27 @@
+export class ChangeDefaultConfigs1709251460718 {
+	name = "ChangeDefaultConfigs1709251460718";
+
+	async up(queryRunner) {
+		await queryRunner.query(
+			`ALTER TABLE "meta" ALTER COLUMN "disableRegistration" SET DEFAULT true`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_profile" ALTER COLUMN "publicReactions" SET DEFAULT true`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_profile" ALTER COLUMN "noCrawle" SET DEFAULT true`,
+		);
+	}
+
+	async down(queryRunner) {
+		await queryRunner.query(
+			`ALTER TABLE "user_profile" ALTER COLUMN "noCrawle" SET DEFAULT false`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "user_profile" ALTER COLUMN "publicReactions" SET DEFAULT false`,
+		);
+		await queryRunner.query(
+			`ALTER TABLE "meta" ALTER COLUMN "disableRegistration" SET DEFAULT false`,
+		);
+	}
+}
diff --git a/packages/backend/src/models/entities/meta.ts b/packages/backend/src/models/entities/meta.ts
index 1c3985efc1..a14967185f 100644
--- a/packages/backend/src/models/entities/meta.ts
+++ b/packages/backend/src/models/entities/meta.ts
@@ -42,7 +42,7 @@ export class Meta {
 	public maintainerEmail: string | null;
 
 	@Column("boolean", {
-		default: false,
+		default: true,
 	})
 	public disableRegistration: boolean;
 
diff --git a/packages/backend/src/models/entities/user-profile.ts b/packages/backend/src/models/entities/user-profile.ts
index 7774ca5086..56887035ce 100644
--- a/packages/backend/src/models/entities/user-profile.ts
+++ b/packages/backend/src/models/entities/user-profile.ts
@@ -85,7 +85,7 @@ export class UserProfile {
 	public emailNotificationTypes: string[];
 
 	@Column("boolean", {
-		default: false,
+		default: true,
 	})
 	public publicReactions: boolean;
 
@@ -156,7 +156,7 @@ export class UserProfile {
 	public autoAcceptFollowed: boolean;
 
 	@Column("boolean", {
-		default: false,
+		default: true,
 		comment: "Whether reject index by crawler.",
 	})
 	public noCrawle: boolean;
diff --git a/packages/client/src/pages/settings/preferences-backups.vue b/packages/client/src/pages/settings/preferences-backups.vue
index 48961649c8..9e8efa478c 100644
--- a/packages/client/src/pages/settings/preferences-backups.vue
+++ b/packages/client/src/pages/settings/preferences-backups.vue
@@ -226,7 +226,10 @@ function getSettings(): Profile["settings"] {
 		hot,
 		cold,
 		fontSize: localStorage.getItem("fontSize"),
-		useSystemFont: localStorage.getItem("useSystemFont") as "t" | "f" | null,
+		useSystemFont: localStorage.getItem("useSystemFont") as
+			| "t"
+			| "f"
+			| null,
 		wallpaper: localStorage.getItem("wallpaper"),
 	};
 }