diff --git a/client/src/app/core/config/config.service.ts b/client/src/app/core/config/config.service.ts
index b8cb15e84..acdc12cc6 100644
--- a/client/src/app/core/config/config.service.ts
+++ b/client/src/app/core/config/config.service.ts
@@ -10,7 +10,7 @@ export class ConfigService {
 
   private config: ServerConfig = {
     signup: {
-      enabled: false
+      allowed: false
     }
   }
 
diff --git a/client/src/app/core/menu/menu.component.html b/client/src/app/core/menu/menu.component.html
index 63a1c03c5..fb4c4a6a9 100644
--- a/client/src/app/core/menu/menu.component.html
+++ b/client/src/app/core/menu/menu.component.html
@@ -14,7 +14,7 @@
       </a>
     </div>
 
-    <a *ngIf="!isLoggedIn && isRegistrationEnabled()" routerLink="/signup" routerLinkActive="active">
+    <a *ngIf="!isLoggedIn && isRegistrationAllowed()" routerLink="/signup" routerLinkActive="active">
       <span class="hidden-xs glyphicon glyphicon-user"></span>
       Signup
     </a>
diff --git a/client/src/app/core/menu/menu.component.ts b/client/src/app/core/menu/menu.component.ts
index b725f64a7..669fc6572 100644
--- a/client/src/app/core/menu/menu.component.ts
+++ b/client/src/app/core/menu/menu.component.ts
@@ -36,8 +36,8 @@ export class MenuComponent implements OnInit {
     )
   }
 
-  isRegistrationEnabled () {
-    return this.configService.getConfig().signup.enabled
+  isRegistrationAllowed () {
+    return this.configService.getConfig().signup.allowed
   }
 
   isUserAdmin () {
diff --git a/config/default.yaml b/config/default.yaml
index b4e7606cf..a97d3ff78 100644
--- a/config/default.yaml
+++ b/config/default.yaml
@@ -33,6 +33,7 @@ admin:
 
 signup:
   enabled: false
+  limit: 10 # When the limit is reached, registrations are disabled. -1 == unlimited
 
 # If enabled, the video will be transcoded to mp4 (x264) with "faststart" flag
 # Uses a lot of CPU!
diff --git a/config/test-1.yaml b/config/test-1.yaml
index e244a8797..d08a3bee6 100644
--- a/config/test-1.yaml
+++ b/config/test-1.yaml
@@ -20,3 +20,6 @@ storage:
 
 admin:
   email: 'admin1@example.com'
+
+signup:
+  limit: 4
diff --git a/server/controllers/api/config.ts b/server/controllers/api/config.ts
index 3e9aa77a5..f02a2bc58 100644
--- a/server/controllers/api/config.ts
+++ b/server/controllers/api/config.ts
@@ -1,6 +1,6 @@
 import * as express from 'express'
 
-import { CONFIG } from '../../initializers'
+import { isSignupAllowed } from '../../helpers'
 import { ServerConfig } from '../../../shared'
 
 const configRouter = express.Router()
@@ -9,12 +9,15 @@ configRouter.get('/', getConfig)
 
 // Get the client credentials for the PeerTube front end
 function getConfig (req: express.Request, res: express.Response, next: express.NextFunction) {
-  const json: ServerConfig = {
-    signup: {
-      enabled: CONFIG.SIGNUP.ENABLED
+
+  isSignupAllowed().then(allowed => {
+    const json: ServerConfig = {
+      signup: {
+        allowed
+      }
     }
-  }
-  res.json(json)
+    res.json(json)
+  })
 }
 
 // ---------------------------------------------------------------------------
diff --git a/server/controllers/api/users.ts b/server/controllers/api/users.ts
index 6c375cc5b..f50dbc9a3 100644
--- a/server/controllers/api/users.ts
+++ b/server/controllers/api/users.ts
@@ -6,7 +6,7 @@ import { logger, getFormatedObjects } from '../../helpers'
 import {
   authenticate,
   ensureIsAdmin,
-  ensureUserRegistrationEnabled,
+  ensureUserRegistrationAllowed,
   usersAddValidator,
   usersUpdateValidator,
   usersRemoveValidator,
@@ -48,7 +48,7 @@ usersRouter.post('/',
 )
 
 usersRouter.post('/register',
-  ensureUserRegistrationEnabled,
+  ensureUserRegistrationAllowed,
   usersAddValidator,
   createUser
 )
diff --git a/server/helpers/utils.ts b/server/helpers/utils.ts
index 9c08afb71..f326210f3 100644
--- a/server/helpers/utils.ts
+++ b/server/helpers/utils.ts
@@ -1,6 +1,8 @@
 import * as express from 'express'
+import * as Promise from 'bluebird'
 
 import { pseudoRandomBytesPromise } from './core-utils'
+import { CONFIG, database as db } from '../initializers'
 import { ResultList } from '../../shared'
 
 function badRequest (req: express.Request, res: express.Response, next: express.NextFunction) {
@@ -30,10 +32,26 @@ function getFormatedObjects<U, T extends FormatableToJSON> (objects: T[], object
   return res
 }
 
+function isSignupAllowed () {
+  if (CONFIG.SIGNUP.ENABLED === false) {
+    return Promise.resolve(false)
+  }
+
+  // No limit and signup is enabled
+  if (CONFIG.SIGNUP.LIMIT === -1) {
+    return Promise.resolve(true)
+  }
+
+  return db.User.countTotal().then(totalUsers => {
+    return totalUsers < CONFIG.SIGNUP.LIMIT
+  })
+}
+
 // ---------------------------------------------------------------------------
 
 export {
   badRequest,
   generateRandomString,
-  getFormatedObjects
+  getFormatedObjects,
+  isSignupAllowed
 }
diff --git a/server/initializers/constants.ts b/server/initializers/constants.ts
index 928a3f570..314a05ab7 100644
--- a/server/initializers/constants.ts
+++ b/server/initializers/constants.ts
@@ -76,7 +76,8 @@ const CONFIG = {
     EMAIL: config.get<string>('admin.email')
   },
   SIGNUP: {
-    ENABLED: config.get<boolean>('signup.enabled')
+    ENABLED: config.get<boolean>('signup.enabled'),
+    LIMIT: config.get<number>('signup.limit')
   },
   TRANSCODING: {
     ENABLED: config.get<boolean>('transcoding.enabled'),
diff --git a/server/middlewares/config.ts b/server/middlewares/config.ts
deleted file mode 100644
index 1481e66cc..000000000
--- a/server/middlewares/config.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import 'express-validator'
-import * as express from 'express'
-
-import { CONFIG } from '../initializers'
-
-function ensureUserRegistrationEnabled (req: express.Request, res: express.Response, next: express.NextFunction) {
-  const registrationEnabled = CONFIG.SIGNUP.ENABLED
-
-  if (registrationEnabled === true) {
-    return next()
-  }
-
-  return res.status(400).send('User registration is not enabled.')
-}
-
-// ---------------------------------------------------------------------------
-
-export {
-  ensureUserRegistrationEnabled
-}
diff --git a/server/middlewares/index.ts b/server/middlewares/index.ts
index 9a3f849a7..d71dd2452 100644
--- a/server/middlewares/index.ts
+++ b/server/middlewares/index.ts
@@ -1,6 +1,5 @@
 export * from './validators'
 export * from './admin'
-export * from './config'
 export * from './oauth'
 export * from './pagination'
 export * from './pods'
diff --git a/server/middlewares/validators/users.ts b/server/middlewares/validators/users.ts
index 38f8aed5b..71e529872 100644
--- a/server/middlewares/validators/users.ts
+++ b/server/middlewares/validators/users.ts
@@ -5,7 +5,7 @@ import * as validator from 'validator'
 
 import { database as db } from '../../initializers/database'
 import { checkErrors } from './utils'
-import { logger } from '../../helpers'
+import { isSignupAllowed, logger } from '../../helpers'
 import { VideoInstance } from '../../models'
 
 function usersAddValidator (req: express.Request, res: express.Response, next: express.NextFunction) {
@@ -88,11 +88,22 @@ function usersVideoRatingValidator (req: express.Request, res: express.Response,
   })
 }
 
+function ensureUserRegistrationAllowed (req: express.Request, res: express.Response, next: express.NextFunction) {
+  isSignupAllowed().then(allowed => {
+    if (allowed === false) {
+      return res.status(403).send('User registration is not enabled or user limit is reached.')
+    }
+
+    return next()
+  })
+}
+
 // ---------------------------------------------------------------------------
 
 export {
   usersAddValidator,
   usersRemoveValidator,
   usersUpdateValidator,
-  usersVideoRatingValidator
+  usersVideoRatingValidator,
+  ensureUserRegistrationAllowed
 }
diff --git a/server/tests/api/check-params/users.js b/server/tests/api/check-params/users.js
index 2c1189f7a..9e7115da1 100644
--- a/server/tests/api/check-params/users.js
+++ b/server/tests/api/check-params/users.js
@@ -513,7 +513,13 @@ describe('Test users API validators', function () {
         password: 'my super password 4'
       }
 
-      requestsUtils.makePostBodyRequest(serverWithRegistrationDisabled.url, registrationPath, serverWithRegistrationDisabled.accessToken, data, done, 400)
+      requestsUtils.makePostBodyRequest(serverWithRegistrationDisabled.url, registrationPath, serverWithRegistrationDisabled.accessToken, data, done, 403)
+    })
+  })
+
+  describe('When registering multiple users on a server with users limit', function () {
+    it('Should fail when after 3 registrations', function (done) {
+      usersUtils.registerUser(server.url, 'user42', 'super password', 403, done)
     })
   })
 
diff --git a/server/tests/api/config.js b/server/tests/api/config.js
index e79e12823..f2c00f85a 100644
--- a/server/tests/api/config.js
+++ b/server/tests/api/config.js
@@ -8,6 +8,7 @@ const series = require('async/series')
 
 const serversUtils = require('../utils/servers')
 const configUtils = require('../utils/config')
+const usersUtils = require('../utils/users')
 
 describe('Test config', function () {
   let server = null
@@ -28,18 +29,51 @@ describe('Test config', function () {
     ], done)
   })
 
-  it('Should have a correct config', function (done) {
+  it('Should have a correct config on a server with registration enabled', function (done) {
     configUtils.getConfig(server.url, function (err, res) {
       if (err) throw err
 
       const data = res.body
 
-      expect(data.signup.enabled).to.be.truthy
+      expect(data.signup.allowed).to.be.truthy
 
       done()
     })
   })
 
+  it('Should have a correct config on a server with registration enabled and a users limit', function (done) {
+    series([
+      function (next) {
+        usersUtils.registerUser(server.url, 'user1', 'super password', done)
+      },
+
+      function (next) {
+        usersUtils.registerUser(server.url, 'user2', 'super password', done)
+      },
+
+      function (next) {
+        usersUtils.registerUser(server.url, 'user3', 'super password', done)
+      },
+
+      function (next) {
+        usersUtils.registerUser(server.url, 'user4', 'super password', done)
+      }
+
+    ], function (err) {
+      if (err) throw err
+
+      configUtils.getConfig(server.url, function (err, res) {
+        if (err) throw err
+
+        const data = res.body
+
+        expect(data.signup.allowed).to.be.truthy
+
+        done()
+      })
+    })
+  })
+
   after(function (done) {
     process.kill(-server.app.pid)
 
diff --git a/shared/models/server-config.model.ts b/shared/models/server-config.model.ts
index a39156963..aab842905 100644
--- a/shared/models/server-config.model.ts
+++ b/shared/models/server-config.model.ts
@@ -1,5 +1,5 @@
 export interface ServerConfig {
   signup: {
-    enabled: boolean
+    allowed: boolean
   }
 }