diff --git a/td/telegram/AuthManager.cpp b/td/telegram/AuthManager.cpp
index 1da0117ed..5836d0efe 100644
--- a/td/telegram/AuthManager.cpp
+++ b/td/telegram/AuthManager.cpp
@@ -165,7 +165,7 @@ void AuthManager::check_bot_token(uint64 query_id, string bot_token) {
                       telegram_api::auth_importBotAuthorization(0, api_id_, api_hash_, bot_token_)));
 }
 
-void AuthManager::request_qr_code_authentication(uint64 query_id, vector<int32> other_user_ids) {
+void AuthManager::request_qr_code_authentication(uint64 query_id, vector<UserId> other_user_ids) {
   if (state_ != State::WaitPhoneNumber) {
     if ((state_ == State::WaitCode || state_ == State::WaitPassword || state_ == State::WaitRegistration) &&
         net_query_id_ == 0) {
@@ -181,8 +181,7 @@ void AuthManager::request_qr_code_authentication(uint64 query_id, vector<int32>
                       "Cannot request QR code authentication after bot token was entered. You need to log out first"));
   }
   for (auto &other_user_id : other_user_ids) {
-    UserId user_id(other_user_id);
-    if (!user_id.is_valid()) {
+    if (!other_user_id.is_valid()) {
       return on_query_error(query_id, Status::Error(400, "Invalid user_id among other user_ids"));
     }
   }
@@ -200,8 +199,8 @@ void AuthManager::request_qr_code_authentication(uint64 query_id, vector<int32>
 void AuthManager::send_export_login_token_query() {
   poll_export_login_code_timeout_.cancel_timeout();
   start_net_query(NetQueryType::RequestQrCode,
-                  G()->net_query_creator().create_unauth(
-                      telegram_api::auth_exportLoginToken(api_id_, api_hash_, vector<int32>(other_user_ids_))));
+                  G()->net_query_creator().create_unauth(telegram_api::auth_exportLoginToken(
+                      api_id_, api_hash_, UserId::get_input_user_ids(other_user_ids_))));
 }
 
 void AuthManager::set_login_token_expires_at(double login_token_expires_at) {
diff --git a/td/telegram/AuthManager.h b/td/telegram/AuthManager.h
index 6ae668b44..dd071021f 100644
--- a/td/telegram/AuthManager.h
+++ b/td/telegram/AuthManager.h
@@ -9,10 +9,10 @@
 #include "td/telegram/net/NetActor.h"
 #include "td/telegram/net/NetQuery.h"
 #include "td/telegram/SendCodeHelper.h"
-#include "td/telegram/TermsOfService.h"
-
 #include "td/telegram/td_api.h"
 #include "td/telegram/telegram_api.h"
+#include "td/telegram/TermsOfService.h"
+#include "td/telegram/UserId.h"
 
 #include "td/actor/actor.h"
 #include "td/actor/Timeout.h"
@@ -38,7 +38,7 @@ class AuthManager : public NetActor {
   void resend_authentication_code(uint64 query_id);
   void check_code(uint64 query_id, string code);
   void register_user(uint64 query_id, string first_name, string last_name);
-  void request_qr_code_authentication(uint64 query_id, vector<int32> other_user_ids);
+  void request_qr_code_authentication(uint64 query_id, vector<UserId> other_user_ids);
   void check_bot_token(uint64 query_id, string bot_token);
   void check_password(uint64 query_id, string password);
   void request_password_recovery(uint64 query_id);
@@ -113,7 +113,7 @@ class AuthManager : public NetActor {
     SendCodeHelper send_code_helper_;
 
     // WaitQrCodeConfirmation
-    vector<int32> other_user_ids_;
+    vector<UserId> other_user_ids_;
     string login_token_;
     double login_token_expires_at_ = 0;
 
@@ -130,7 +130,7 @@ class AuthManager : public NetActor {
       return state;
     }
 
-    static DbState wait_qr_code_confirmation(int32 api_id, string api_hash, vector<int32> other_user_ids,
+    static DbState wait_qr_code_confirmation(int32 api_id, string api_hash, vector<UserId> other_user_ids,
                                              string login_token, double login_token_expires_at) {
       DbState state(State::WaitQrCodeConfirmation, api_id, api_hash);
       state.other_user_ids_ = std::move(other_user_ids);
@@ -179,7 +179,7 @@ class AuthManager : public NetActor {
   string code_;
 
   // State::WaitQrCodeConfirmation
-  vector<int32> other_user_ids_;
+  vector<UserId> other_user_ids_;
   string login_token_;
   double login_token_expires_at_ = 0.0;
   int32 imported_dc_id_ = -1;
diff --git a/td/telegram/DeviceTokenManager.cpp b/td/telegram/DeviceTokenManager.cpp
index 27a9020ca..758cda9c0 100644
--- a/td/telegram/DeviceTokenManager.cpp
+++ b/td/telegram/DeviceTokenManager.cpp
@@ -120,7 +120,7 @@ StringBuilder &operator<<(StringBuilder &string_builder, const DeviceTokenManage
 }
 
 void DeviceTokenManager::register_device(tl_object_ptr<td_api::DeviceToken> device_token_ptr,
-                                         vector<int32> other_user_ids,
+                                         vector<UserId> other_user_ids,
                                          Promise<td_api::object_ptr<td_api::pushReceiverId>> promise) {
   CHECK(device_token_ptr != nullptr);
   TokenType token_type;
@@ -227,8 +227,7 @@ void DeviceTokenManager::register_device(tl_object_ptr<td_api::DeviceToken> devi
     return promise.set_error(Status::Error(400, "Device token must be encoded in UTF-8"));
   }
   for (auto &other_user_id : other_user_ids) {
-    UserId user_id(other_user_id);
-    if (!user_id.is_valid()) {
+    if (!other_user_id.is_valid()) {
       return promise.set_error(Status::Error(400, "Invalid user_id among other user_ids"));
     }
   }
@@ -373,12 +372,12 @@ void DeviceTokenManager::loop() {
     auto other_user_ids = info.other_user_ids;
     if (info.state == TokenInfo::State::Unregister) {
       net_query = G()->net_query_creator().create(
-          telegram_api::account_unregisterDevice(token_type, info.token, std::move(other_user_ids)));
+          telegram_api::account_unregisterDevice(token_type, info.token, UserId::get_input_user_ids(other_user_ids)));
     } else {
       int32 flags = telegram_api::account_registerDevice::NO_MUTED_MASK;
-      net_query = G()->net_query_creator().create(
-          telegram_api::account_registerDevice(flags, false /*ignored*/, token_type, info.token, info.is_app_sandbox,
-                                               BufferSlice(info.encryption_key), std::move(other_user_ids)));
+      net_query = G()->net_query_creator().create(telegram_api::account_registerDevice(
+          flags, false /*ignored*/, token_type, info.token, info.is_app_sandbox, BufferSlice(info.encryption_key),
+          UserId::get_input_user_ids(other_user_ids)));
     }
     info.net_query_id = net_query->id();
     G()->net_query_dispatcher().dispatch_with_callback(std::move(net_query), actor_shared(this, token_type));
diff --git a/td/telegram/DeviceTokenManager.h b/td/telegram/DeviceTokenManager.h
index 76b728f9e..d8aa77b13 100644
--- a/td/telegram/DeviceTokenManager.h
+++ b/td/telegram/DeviceTokenManager.h
@@ -10,8 +10,8 @@
 #include "td/actor/PromiseFuture.h"
 
 #include "td/telegram/net/NetQuery.h"
-
 #include "td/telegram/td_api.h"
+#include "td/telegram/UserId.h"
 
 #include "td/utils/common.h"
 #include "td/utils/Slice.h"
@@ -26,7 +26,7 @@ class DeviceTokenManager : public NetQueryCallback {
  public:
   explicit DeviceTokenManager(ActorShared<> parent) : parent_(std::move(parent)) {
   }
-  void register_device(tl_object_ptr<td_api::DeviceToken> device_token_ptr, vector<int32> other_user_ids,
+  void register_device(tl_object_ptr<td_api::DeviceToken> device_token_ptr, vector<UserId> other_user_ids,
                        Promise<td_api::object_ptr<td_api::pushReceiverId>> promise);
 
   void reregister_device();
@@ -55,7 +55,7 @@ class DeviceTokenManager : public NetQueryCallback {
     State state = State::Sync;
     string token;
     uint64 net_query_id = 0;
-    vector<int32> other_user_ids;
+    vector<UserId> other_user_ids;
     bool is_app_sandbox = false;
     bool encrypt = false;
     string encryption_key;
diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index f35a8ebc2..725097909 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -1840,11 +1840,11 @@ class CreateNewGroupChatRequest : public RequestActor<> {
   }
 
  public:
-  CreateNewGroupChatRequest(ActorShared<Td> td, uint64 request_id, vector<int32> user_ids, string title)
-      : RequestActor(std::move(td), request_id), title_(std::move(title)), random_id_(0) {
-    for (auto user_id : user_ids) {
-      user_ids_.emplace_back(user_id);
-    }
+  CreateNewGroupChatRequest(ActorShared<Td> td, uint64 request_id, vector<UserId> user_ids, string title)
+      : RequestActor(std::move(td), request_id)
+      , user_ids_(std::move(user_ids))
+      , title_(std::move(title))
+      , random_id_(0) {
   }
 };
 
@@ -2058,16 +2058,14 @@ class GetChatEventLogRequest : public RequestOnceActor {
 
  public:
   GetChatEventLogRequest(ActorShared<Td> td, uint64 request_id, int64 dialog_id, string &&query, int64 from_event_id,
-                         int32 limit, tl_object_ptr<td_api::chatEventLogFilters> &&filters, vector<int32> user_ids)
+                         int32 limit, tl_object_ptr<td_api::chatEventLogFilters> &&filters, vector<UserId> user_ids)
       : RequestOnceActor(std::move(td), request_id)
       , dialog_id_(dialog_id)
       , query_(std::move(query))
       , from_event_id_(from_event_id)
       , limit_(limit)
-      , filters_(std::move(filters)) {
-    for (auto user_id : user_ids) {
-      user_ids_.emplace_back(user_id);
-    }
+      , filters_(std::move(filters))
+      , user_ids_(std::move(user_ids)) {
   }
 };
 
@@ -2152,11 +2150,8 @@ class RemoveContactsRequest : public RequestActor<> {
   }
 
  public:
-  RemoveContactsRequest(ActorShared<Td> td, uint64 request_id, vector<int32> &&user_ids)
-      : RequestActor(std::move(td), request_id) {
-    for (auto user_id : user_ids) {
-      user_ids_.emplace_back(user_id);
-    }
+  RemoveContactsRequest(ActorShared<Td> td, uint64 request_id, vector<UserId> &&user_ids)
+      : RequestActor(std::move(td), request_id), user_ids_(std::move(user_ids)) {
     set_tries(3);  // load_contacts + delete_contacts
   }
 };
@@ -4761,7 +4756,7 @@ void Td::on_request(uint64 id, td_api::registerUser &request) {
 
 void Td::on_request(uint64 id, td_api::requestQrCodeAuthentication &request) {
   send_closure(auth_manager_actor_, &AuthManager::request_qr_code_authentication, id,
-               std::move(request.other_user_ids_));
+               UserId::get_user_ids(request.other_user_ids_));
 }
 
 void Td::on_request(uint64 id, td_api::checkAuthenticationPassword &request) {
@@ -4950,7 +4945,7 @@ void Td::on_request(uint64 id, td_api::registerDevice &request) {
   }
   CREATE_REQUEST_PROMISE();
   send_closure(device_token_manager_, &DeviceTokenManager::register_device, std::move(request.device_token_),
-               std::move(request.other_user_ids_), std::move(promise));
+               UserId::get_user_ids(request.other_user_ids_), std::move(promise));
 }
 
 void Td::on_request(uint64 id, td_api::getUserPrivacySettingRules &request) {
@@ -5881,7 +5876,7 @@ void Td::on_request(uint64 id, td_api::createSecretChat &request) {
 void Td::on_request(uint64 id, td_api::createNewBasicGroupChat &request) {
   CHECK_IS_USER();
   CLEAN_INPUT_STRING(request.title_);
-  CREATE_REQUEST(CreateNewGroupChatRequest, request.user_ids_, std::move(request.title_));
+  CREATE_REQUEST(CreateNewGroupChatRequest, UserId::get_user_ids(request.user_ids_), std::move(request.title_));
 }
 
 void Td::on_request(uint64 id, td_api::createNewSupergroupChat &request) {
@@ -6023,12 +6018,8 @@ void Td::on_request(uint64 id, const td_api::revokeGroupCallInviteLink &request)
 void Td::on_request(uint64 id, const td_api::inviteGroupCallParticipants &request) {
   CHECK_IS_USER();
   CREATE_OK_REQUEST_PROMISE();
-  vector<UserId> user_ids;
-  for (auto &user_id : request.user_ids_) {
-    user_ids.emplace_back(user_id);
-  }
-  group_call_manager_->invite_group_call_participants(GroupCallId(request.group_call_id_), std::move(user_ids),
-                                                      std::move(promise));
+  group_call_manager_->invite_group_call_participants(GroupCallId(request.group_call_id_),
+                                                      UserId::get_user_ids(request.user_ids_), std::move(promise));
 }
 
 void Td::on_request(uint64 id, const td_api::getGroupCallInviteLink &request) {
@@ -6337,11 +6328,8 @@ void Td::on_request(uint64 id, const td_api::addChatMember &request) {
 void Td::on_request(uint64 id, const td_api::addChatMembers &request) {
   CHECK_IS_USER();
   CREATE_OK_REQUEST_PROMISE();
-  vector<UserId> user_ids;
-  for (auto &user_id : request.user_ids_) {
-    user_ids.emplace_back(user_id);
-  }
-  contacts_manager_->add_dialog_participants(DialogId(request.chat_id_), user_ids, std::move(promise));
+  contacts_manager_->add_dialog_participants(DialogId(request.chat_id_), UserId::get_user_ids(request.user_ids_),
+                                             std::move(promise));
 }
 
 void Td::on_request(uint64 id, td_api::setChatMemberStatus &request) {
@@ -6488,7 +6476,7 @@ void Td::on_request(uint64 id, td_api::getChatEventLog &request) {
   CHECK_IS_USER();
   CLEAN_INPUT_STRING(request.query_);
   CREATE_REQUEST(GetChatEventLogRequest, request.chat_id_, std::move(request.query_), request.from_event_id_,
-                 request.limit_, std::move(request.filters_), std::move(request.user_ids_));
+                 request.limit_, std::move(request.filters_), UserId::get_user_ids(request.user_ids_));
 }
 
 void Td::on_request(uint64 id, const td_api::clearAllDraftMessages &request) {
@@ -6728,7 +6716,7 @@ void Td::on_request(uint64 id, td_api::searchContacts &request) {
 
 void Td::on_request(uint64 id, td_api::removeContacts &request) {
   CHECK_IS_USER();
-  CREATE_REQUEST(RemoveContactsRequest, std::move(request.user_ids_));
+  CREATE_REQUEST(RemoveContactsRequest, UserId::get_user_ids(request.user_ids_));
 }
 
 void Td::on_request(uint64 id, const td_api::getImportedContactCount &request) {
diff --git a/td/telegram/UserId.h b/td/telegram/UserId.h
index 3e87c06ec..85bb74c75 100644
--- a/td/telegram/UserId.h
+++ b/td/telegram/UserId.h
@@ -25,6 +25,24 @@ class UserId {
   template <class T, typename = std::enable_if_t<std::is_convertible<T, int32>::value>>
   UserId(T user_id) = delete;
 
+  static vector<UserId> get_user_ids(const vector<int32> &input_user_ids) {
+    vector<UserId> user_ids;
+    user_ids.reserve(input_user_ids.size());
+    for (auto &input_user_id : input_user_ids) {
+      user_ids.emplace_back(input_user_id);
+    }
+    return user_ids;
+  }
+
+  static vector<int32> get_input_user_ids(const vector<UserId> &user_ids) {
+    vector<int32> input_user_ids;
+    input_user_ids.reserve(user_ids.size());
+    for (auto &user_id : user_ids) {
+      input_user_ids.emplace_back(user_id.get());
+    }
+    return input_user_ids;
+  }
+
   bool is_valid() const {
     return id > 0;
   }