diff --git a/Recources.qrc b/Recources.qrc
index 67a7a5f..e636270 100644
--- a/Recources.qrc
+++ b/Recources.qrc
@@ -6,5 +6,6 @@
         <file>images/STIconGreen.png</file>
         <file>images/STIconOrange.png</file>
         <file>images/STIconRed.png</file>
+        <file>version.json</file>
     </qresource>
 </RCC>
diff --git a/ScreenTranslator.pro b/ScreenTranslator.pro
index 1376116..09445db 100644
--- a/ScreenTranslator.pro
+++ b/ScreenTranslator.pro
@@ -41,7 +41,8 @@ SOURCES += main.cpp\
     WebTranslatorProxy.cpp \
     TranslatorHelper.cpp \
     RecognizerHelper.cpp \
-    Utils.cpp
+    Utils.cpp \
+    Updater.cpp
 
 HEADERS  += \
     Manager.h \
@@ -59,7 +60,8 @@ HEADERS  += \
     StAssert.h \
     TranslatorHelper.h \
     RecognizerHelper.h \
-    Utils.h
+    Utils.h \
+    Updater.h
 
 FORMS    += \
     SettingsEditor.ui \
@@ -76,6 +78,7 @@ TRANSLATIONS += \
 OTHER_FILES += \
     app.rc \
     images/icon.ico \
+    version.json \
     README.md \
     uncrustify.cfg\
     translators/google.js \
diff --git a/Updater.cpp b/Updater.cpp
new file mode 100644
index 0000000..ff74312
--- /dev/null
+++ b/Updater.cpp
@@ -0,0 +1,263 @@
+#include <QDir>
+#include <QFile>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QNetworkRequest>
+#include <QNetworkReply>
+#include <QMessageBox>
+
+#include "Updater.h"
+#include "StAssert.h"
+
+namespace {
+#define FIELD(NAME) const QString _ ## NAME = #NAME
+  FIELD (Application);
+
+  FIELD (name);
+  FIELD (version);
+  FIELD (compatibleVersion);
+  FIELD (built_in);
+  FIELD (versionString);
+  FIELD (permissions);
+  FIELD (url);
+  FIELD (path);
+#undef FIELD
+
+#if defined(Q_OS_WIN)
+  const QString _platform = "_win";
+#elif defined(Q_OS_LINUX)
+  const QString _platform = "_linux";
+#endif
+
+  QString versionField (const QJsonObject &component, const QString &field) {
+    return component.contains (field + _platform)
+           ? component[field + _platform].toString ()
+           : component[field].toString ();
+  }
+
+  QFileInfo fileDir (const QString &fileName) {
+    return QFileInfo (fileName).absolutePath ();
+  }
+}
+
+Updater::Updater (QObject *parent)
+  : QObject (parent),
+  network_ (new QNetworkAccessManager (this)),
+  componentsUpdating_ (0) {
+  updatesFileName_ = "updates.json";
+  backupSuffix_ = "_backup";
+  connect (network_, SIGNAL (finished (QNetworkReply *)),
+           SLOT (replyFinished (QNetworkReply *)));
+
+  getCurrentVersion ();
+  updateCurrentVersion ();
+}
+
+QDateTime Updater::nextCheckTime (const QDateTime &lastCheckTime, int updateType) const {
+  QDateTime nextTime;
+  switch (updateType) {
+    case UpdateTypeDaily:
+      nextTime = lastCheckTime.addDays (1);
+      break;
+    case UpdateTypeWeekly:
+      nextTime =  lastCheckTime.addDays (7);
+      break;
+    case UpdateTypeMonthly:
+      nextTime =  lastCheckTime.addDays (30);
+      break;
+    case UpdateTypeNever:
+    default:
+      return QDateTime ();
+  }
+  if (nextTime < QDateTime::currentDateTime ()) {
+    return QDateTime::currentDateTime ().addSecs (5);
+  }
+  return nextTime;
+}
+
+void Updater::getCurrentVersion () {
+  QFile f (":/version.json");
+  if (f.open (QFile::ReadOnly)) {
+    currentVersion_ = QJsonDocument::fromJson (f.readAll ()).object ();
+    f.close ();
+  }
+  else {
+    emit error (tr ("Ошибка определения текущей версии. Обновление недоступно."));
+  }
+}
+
+void Updater::updateCurrentVersion () {
+  QFile f (updatesFileName_);
+  if (!f.open (QFile::ReadOnly)) {
+    return;
+  }
+  QJsonObject updated = QJsonDocument::fromJson (f.readAll ()).object ();
+  f.close ();
+  foreach (const QString &component, updated.keys ()) {
+    QJsonObject current = currentVersion_[component].toObject ();
+    int updatedVersion = updated[component].toInt ();
+    if (current[_built_in].toBool () || current[_version].toInt () >= updatedVersion) {
+      continue;
+    }
+    current[_version] = updatedVersion;
+    currentVersion_[component] = current;
+  }
+}
+
+QString Updater::currentAppVersion () const {
+  return currentVersion_[_Application].toObject ()[_versionString].toString ();
+}
+
+void Updater::checkForUpdates () {
+  getAvailableVersion ();
+}
+
+void Updater::getAvailableVersion () {
+  QNetworkRequest request (versionField (currentVersion_, _url));
+  request.setAttribute (QNetworkRequest::User, _version);
+  network_->get (request);
+}
+
+void Updater::replyFinished (QNetworkReply *reply) {
+  if (reply->error () != QNetworkReply::NoError) {
+    emit tr ("Ошибка загрузки информации для обновления.");
+    return;
+  }
+  QByteArray content = reply->readAll ();
+  QString component = reply->request ().attribute (QNetworkRequest::User).toString ();
+  if (component == _version) {
+    availableVersion_ = QJsonDocument::fromJson (content).object ();
+    parseAvailableVersion ();
+  }
+  else if (availableVersion_.contains (component) && !content.isEmpty ()) {
+    installComponent (component, content);
+  }
+  reply->deleteLater ();
+}
+
+void Updater::parseAvailableVersion () {
+  QStringList inaccessible, incompatible;
+  QStringList updateList;
+  QDir currentDir;
+  foreach (const QString &component, availableVersion_.keys ()) {
+    QJsonObject available = availableVersion_[component].toObject ();
+    QJsonObject current = currentVersion_[component].toObject ();
+    QString path = versionField (available, _path);
+    if (path.isEmpty ()) {
+      continue;
+    }
+
+    QFileInfo installDir = fileDir (path);
+    if (!installDir.exists ()) {
+      currentDir.mkpath (installDir.absoluteFilePath ());
+    }
+    if (!installDir.isWritable ()) { // check dir because install = remove + make new
+      inaccessible << installDir.absoluteFilePath ();
+    }
+    if (current[_version].toInt () < available[_compatibleVersion].toInt ()) {
+      incompatible << component;
+    }
+    if (!QFile::exists (path) || current[_version].toInt () < available[_version].toInt ()) {
+      updateList << component;
+    }
+  }
+  if (updateList.isEmpty ()) {
+    return;
+  }
+
+  QFileInfo updateFileDir = fileDir (updatesFileName_);
+  if (!updateFileDir.isWritable ()) {
+    inaccessible << updateFileDir.absoluteFilePath ();
+  }
+  inaccessible.removeDuplicates ();
+
+  QString message = tr ("Доступно обновлений: %1.\n").arg (updateList.size ());
+  QMessageBox::StandardButtons buttons = QMessageBox::Ok;
+  if (!incompatible.isEmpty ()) {
+    message += tr ("Несовместимых обновлений: %1.\nВыполните обновление вручную.")
+               .arg (incompatible.size ());
+  }
+  else if (!inaccessible.isEmpty ()) {
+    message += tr ("Недоступных для записи директорий: %1.\n%2\nИзмените права доступа и "
+                   "повторите попытку или выполните обновление вручную.")
+               .arg (inaccessible.size ()).arg (inaccessible.join ("\n"));
+  }
+  else {
+    message += tr ("Обновить?");
+    buttons = QMessageBox::Yes | QMessageBox::No;
+  }
+  int result = QMessageBox::question (NULL, tr ("Обновление"), message, buttons);
+  if (result == QMessageBox::Yes) {
+    componentsUpdating_ = updateList.size ();
+    foreach (const QString &component, updateList) {
+      getComponent (component);
+    }
+  }
+}
+
+void Updater::getComponent (const QString &component) {
+  QJsonObject available = availableVersion_[component].toObject ();
+  QString path = versionField (available, _path);
+  if (path.isEmpty ()) {
+    --componentsUpdating_;
+    return;
+  }
+
+  QString url = versionField (available, _url);
+  if (url.isEmpty ()) { // just remove component
+    installComponent (component, QByteArray ());
+  }
+  else {
+    QNetworkRequest request (url);
+    request.setAttribute (QNetworkRequest::User, component);
+    network_->get (request);
+  }
+}
+
+void Updater::installComponent (const QString &component, const QByteArray &newContent) {
+  --componentsUpdating_;
+  ST_ASSERT (availableVersion_.contains (component));
+  QJsonObject available = availableVersion_[component].toObject ();
+  QString path = versionField (available, _path);
+  ST_ASSERT (!path.isEmpty ());
+
+  QString backup = path + backupSuffix_;
+  QFile::remove (backup);
+  QFile::rename (path, backup);
+
+  if (!newContent.isEmpty ()) {
+    QFile f (path);
+    if (!f.open (QFile::WriteOnly)) {
+      emit error (tr ("Ошибка обновления файла (%1).").arg (path));
+      return;
+    }
+    f.write (newContent);
+    f.close ();
+    bool ok;
+    QFileDevice::Permissions perm (available[_permissions].toString ().toUInt (&ok, 16));
+    if (ok) {
+      f.setPermissions (perm);
+    }
+  }
+  updateVersionInfo (component, available[_version].toInt ());
+
+  if (componentsUpdating_ == 0) {
+    emit updated ();
+    QString message = tr ("Обновление завершено. Для активации некоторых компонентов "
+                          "может потребоваться перезапуск.");
+    QMessageBox::information (NULL, tr ("Обновление"), message, QMessageBox::Ok);
+  }
+}
+
+void Updater::updateVersionInfo (const QString &component, int version) {
+  QFile f (updatesFileName_);
+  if (!f.open (QFile::ReadWrite)) {
+    emit error (tr ("Ошибка обновления файла с текущей версией."));
+    return;
+  }
+  QJsonObject updated = QJsonDocument::fromJson (f.readAll ()).object ();
+  updated[component] = version;
+  f.seek (0);
+  f.write (QJsonDocument (updated).toJson ());
+  f.close ();
+}
diff --git a/Updater.h b/Updater.h
new file mode 100644
index 0000000..8b5d17a
--- /dev/null
+++ b/Updater.h
@@ -0,0 +1,65 @@
+#ifndef UPDATER_H
+#define UPDATER_H
+
+#include <QObject>
+#include <QJsonObject>
+#include <QNetworkAccessManager>
+
+/*!
+ * \brief The Updater class.
+ *
+ * Allows to download and copy files from remote source to local machine.
+ */
+class Updater : public QObject {
+  Q_OBJECT
+
+  public:
+    enum UpdateType {
+      UpdateTypeNever, UpdateTypeDaily, UpdateTypeWeekly, UpdateTypeMonthly
+    };
+
+    explicit Updater (QObject *parent = 0);
+
+    QString currentAppVersion () const;
+
+    //! Initiate updates check.
+    void checkForUpdates ();
+
+    //! Get nearest update check time based on given settings.
+    QDateTime nextCheckTime (const QDateTime &lastCheckTime, int updateType) const;
+
+  signals:
+    void error (const QString &message);
+    //! Emited after all components updated.
+    void updated ();
+
+  private slots:
+    //! Handle remote downloads finish.
+    void replyFinished (QNetworkReply *reply);
+
+  private:
+    //! Load current version info (built-in).
+    void getCurrentVersion ();
+    //! Update current version info with information about preformed updates.
+    void updateCurrentVersion ();
+    //! Load latest available version info from remote source.
+    void getAvailableVersion ();
+    //! Check is updates available, prompt user and start update.
+    void parseAvailableVersion ();
+    //! Start update of given component.
+    void getComponent (const QString &component);
+    //! Finalize update of given component with given new content.
+    void installComponent (const QString &component, const QByteArray &newContent);
+    //! Save information about component update on disk (for updateCurrentVersion()).
+    void updateVersionInfo (const QString &component, int version);
+
+  private:
+    QNetworkAccessManager *network_;
+    QJsonObject availableVersion_;
+    QJsonObject currentVersion_;
+    QString updatesFileName_;
+    int componentsUpdating_;
+    QString backupSuffix_;
+};
+
+#endif // UPDATER_H
diff --git a/version.json b/version.json
new file mode 100644
index 0000000..8d78aa1
--- /dev/null
+++ b/version.json
@@ -0,0 +1,30 @@
+{
+    "version": 1,
+    "url": "https://cdn.rawgit.com/OneMoreGres/ScreenTranslator/master/version.json",
+    "Application": {
+        "version": 1,
+        "compatibleVersion": 1,
+        "built_in": true,
+        "versionString": "2.0.0",
+        "permissions": "0x7755",
+        "url_win": "https://raw.githubusercontent.com/OneMoreGres/ScreenTranslator/releases/2.0.0/ScreenTranslator.exe",
+        "path_win": "ScreenTranslator.exe",
+        "url_linux": "https://raw.githubusercontent.com/OneMoreGres/ScreenTranslator/releases/2.0.0/ScreenTranslator",
+        "path_linux": "ScreenTranslator"
+    },
+    "Bing translator": {
+        "version": 1,
+        "url": "https://raw.githubusercontent.com/OneMoreGres/ScreenTranslator/master/translators/bing.js",
+        "path": "translators/bing.js"
+    },
+    "Google translator": {
+        "version": 1,
+        "url": "https://raw.githubusercontent.com/OneMoreGres/ScreenTranslator/master/translators/google.js",
+        "path": "translators/google.js"
+    },
+    "Yandex translator": {
+        "version": 1,
+        "url": "https://raw.githubusercontent.com/OneMoreGres/ScreenTranslator/master/translators/yandex.js",
+        "path": "translators/yandex.js"
+    }
+}