diff --git a/.config/example.yml b/.config/example.yml
index 7817578d9a..9d071c1cc3 100644
--- a/.config/example.yml
+++ b/.config/example.yml
@@ -144,3 +144,6 @@ id: 'aid'
 
 # Upload or download file size limits (bytes)
 #maxFileSize: 262144000
+
+# Maxium users, should be used for hosting management services
+#maxUserSignups: 100
diff --git a/packages/backend/src/config/load.ts b/packages/backend/src/config/load.ts
index 8e73059855..c479ccc40a 100644
--- a/packages/backend/src/config/load.ts
+++ b/packages/backend/src/config/load.ts
@@ -6,7 +6,7 @@ import * as fs from 'node:fs';
 import { fileURLToPath } from 'node:url';
 import { dirname } from 'node:path';
 import * as yaml from 'js-yaml';
-import { Source, Mixin } from './types.js';
+import type { Source, Mixin } from './types.js';
 
 const _filename = fileURLToPath(import.meta.url);
 const _dirname = dirname(_filename);
diff --git a/packages/backend/src/config/types.ts b/packages/backend/src/config/types.ts
index 2f182e1aeb..ccd7b13323 100644
--- a/packages/backend/src/config/types.ts
+++ b/packages/backend/src/config/types.ts
@@ -63,6 +63,8 @@ export type Source = {
 
 	mediaProxy?: string;
 	proxyRemoteFiles?: boolean;
+
+	maxUserSignups?: number;
 };
 
 /**
diff --git a/packages/backend/src/server/api/common/signup.ts b/packages/backend/src/server/api/common/signup.ts
index abc142472a..22a1f25e35 100644
--- a/packages/backend/src/server/api/common/signup.ts
+++ b/packages/backend/src/server/api/common/signup.ts
@@ -11,6 +11,7 @@ import { UserKeypair } from '@/models/entities/user-keypair.js';
 import { usersChart } from '@/services/chart/index.js';
 import { UsedUsername } from '@/models/entities/used-username.js';
 import { db } from '@/db/postgre.js';
+import config from '@/config/index.js';
 
 export async function signup(opts: {
 	username: User['username'];
@@ -21,6 +22,14 @@ export async function signup(opts: {
 	const { username, password, passwordHash, host } = opts;
 	let hash = passwordHash;
 
+	const userCount = await Users.countBy({
+		host: IsNull(),
+	});
+
+	if (config.maxUserSignups != null && config.maxUserSignups > userCount) {
+		throw new Error('MAX_USERS_REACHED');
+	}
+
 	// Validate username
 	if (!Users.validateLocalUsername(username)) {
 		throw new Error('INVALID_USERNAME');