diff --git a/src/core/user/providers/offline.ts b/src/core/user/providers/offline.ts
new file mode 100644
index 000000000..36ccc4c05
--- /dev/null
+++ b/src/core/user/providers/offline.ts
@@ -0,0 +1,114 @@
+// (C) Copyright 2015 Martin Dougiamas
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Injectable } from '@angular/core';
+import { CoreSitesProvider, CoreSiteSchema } from '@providers/sites';
+
+/**
+ * Structure of offline user preferences.
+ */
+export interface CoreUserOfflinePreference {
+    name: string;
+    value: string;
+    onlinevalue: string;
+}
+
+/**
+ * Service to handle offline user preferences.
+ */
+@Injectable()
+export class CoreUserOfflineProvider {
+
+    // Variables for database.
+    static PREFERENCES_TABLE = 'user_preferences';
+    protected siteSchema: CoreSiteSchema = {
+        name: 'CoreUserOfflineProvider',
+        version: 1,
+        tables: [
+            {
+                name: CoreUserOfflineProvider.PREFERENCES_TABLE,
+                columns: [
+                    {
+                        name: 'name',
+                        type: 'TEXT',
+                        unique: true,
+                        notNull: true
+                    },
+                    {
+                        name: 'value',
+                        type: 'TEXT'
+                    },
+                    {
+                        name: 'onlinevalue',
+                        type: 'TEXT'
+                    },
+                ]
+            }
+        ]
+    };
+
+    constructor(private sitesProvider: CoreSitesProvider) {
+        this.sitesProvider.registerSiteSchema(this.siteSchema);
+    }
+
+    /**
+     * Get preferences that were changed offline.
+     *
+     * @return {Promise<CoreUserOfflinePreference[]>} Promise resolved with list of preferences.
+     */
+    getChangedPreferences(siteId?: string): Promise<CoreUserOfflinePreference[]> {
+        return this.sitesProvider.getSite(siteId).then((site) => {
+            return site.getDb().getRecordsSelect(CoreUserOfflineProvider.PREFERENCES_TABLE, 'value != onlineValue');
+        });
+    }
+
+    /**
+     * Get an offline preference.
+     *
+     * @param {string} name Name of the preference.
+     * @return {Promise<CoreUserOfflinePreference>} Promise resolved with the preference, rejected if not found.
+     */
+    getPreference(name: string, siteId?: string): Promise<CoreUserOfflinePreference> {
+        return this.sitesProvider.getSite(siteId).then((site) => {
+            const conditions = { name };
+
+            return site.getDb().getRecord(CoreUserOfflineProvider.PREFERENCES_TABLE, conditions);
+        });
+    }
+
+    /**
+     * Set an offline preference.
+     *
+     * @param {string} name Name of the preference.
+     * @param {string} value Value of the preference.
+     * @param {string} onlineValue Online value of the preference. If unedfined, preserve previously stored value.
+     * @return {Promise<CoreUserPreference>} Promise resolved when done.
+     */
+    setPreference(name: string, value: string, onlineValue?: string, siteId?: string): Promise<any> {
+        return this.sitesProvider.getSite(siteId).then((site) => {
+            let promise: Promise<string>;
+            if (typeof onlineValue == 'undefined') {
+                promise = this.getPreference(name, site.id).then((preference) => preference.onlinevalue);
+            } else {
+                promise = Promise.resolve(onlineValue);
+            }
+
+            return promise.then((onlineValue) => {
+                const record = { name, value, onlinevalue: onlineValue };
+
+                return site.getDb().insertRecord(CoreUserOfflineProvider.PREFERENCES_TABLE, record);
+            });
+        });
+    }
+}
diff --git a/src/core/user/providers/sync-cron-handler.ts b/src/core/user/providers/sync-cron-handler.ts
new file mode 100644
index 000000000..a51b2da8b
--- /dev/null
+++ b/src/core/user/providers/sync-cron-handler.ts
@@ -0,0 +1,48 @@
+// (C) Copyright 2015 Martin Dougiamas
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Injectable } from '@angular/core';
+import { CoreCronHandler } from '@providers/cron';
+import { CoreUserSyncProvider } from './sync';
+
+/**
+ * Synchronization cron handler.
+ */
+@Injectable()
+export class CoreUserSyncCronHandler implements CoreCronHandler {
+    name = 'CoreUserSyncCronHandler';
+
+    constructor(private userSync: CoreUserSyncProvider) {}
+
+    /**
+     * Execute the process.
+     * Receives the ID of the site affected, undefined for all sites.
+     *
+     * @param {string} [siteId] ID of the site affected, undefined for all sites.
+     * @param {boolean} [force] Wether the execution is forced (manual sync).
+     * @return {Promise<any>} Promise resolved when done, rejected if failure.
+     */
+    execute(siteId?: string, force?: boolean): Promise<any> {
+        return this.userSync.syncPreferences(siteId);
+    }
+
+    /**
+     * Get the time between consecutive executions.
+     *
+     * @return {number} Time between consecutive executions (in ms).
+     */
+    getInterval(): number {
+        return 300000; // 5 minutes.
+    }
+}
diff --git a/src/core/user/providers/sync.ts b/src/core/user/providers/sync.ts
new file mode 100644
index 000000000..c63e8dc61
--- /dev/null
+++ b/src/core/user/providers/sync.ts
@@ -0,0 +1,100 @@
+// (C) Copyright 2015 Martin Dougiamas
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import { Injectable } from '@angular/core';
+import { CoreLoggerProvider } from '@providers/logger';
+import { CoreSitesProvider } from '@providers/sites';
+import { CoreSyncBaseProvider } from '@classes/base-sync';
+import { CoreAppProvider } from '@providers/app';
+import { CoreUserOfflineProvider } from './offline';
+import { CoreUserProvider } from './user';
+import { CoreTextUtilsProvider } from '@providers/utils/text';
+import { CoreTimeUtilsProvider } from '@providers/utils/time';
+import { CoreUtilsProvider } from '@providers/utils/utils';
+import { TranslateService } from '@ngx-translate/core';
+import { CoreSyncProvider } from '@providers/sync';
+
+/**
+ * Service to sync user preferences.
+ */
+@Injectable()
+export class CoreUserSyncProvider extends CoreSyncBaseProvider {
+
+    static AUTO_SYNCED = 'core_user_autom_synced';
+
+    constructor(loggerProvider: CoreLoggerProvider, sitesProvider: CoreSitesProvider, appProvider: CoreAppProvider,
+            translate: TranslateService, syncProvider: CoreSyncProvider, textUtils: CoreTextUtilsProvider,
+            private userOffline: CoreUserOfflineProvider, private userProvider: CoreUserProvider,
+            private utils: CoreUtilsProvider, timeUtils: CoreTimeUtilsProvider) {
+        super('CoreUserSync', loggerProvider, sitesProvider, appProvider, syncProvider, textUtils, translate, timeUtils);
+    }
+
+    /**
+     * Try to synchronize user preferences in a certain site or in all sites.
+     *
+     * @param {string} [siteId] Site ID to sync. If not defined, sync all sites.
+     * @return {Promise<any>} Promise resolved if sync is successful, rejected if sync fails.
+     */
+    syncPreferences(siteId?: string): Promise<any> {
+        const syncFunctionLog = 'all user preferences';
+
+        return this.syncOnSites(syncFunctionLog, this.syncPreferencesFunc.bind(this), [], siteId);
+    }
+
+    /**
+     * Sync user preferences of a site.
+     *
+     * @param {string} [siteId] Site ID to sync. If not defined, sync all sites.
+     * @param {Promise<any>} Promise resolved if sync is successful, rejected if sync fails.
+     */
+    protected syncPreferencesFunc(siteId?: string): Promise<any> {
+        siteId = siteId || this.sitesProvider.getCurrentSiteId();
+
+        const syncId = 'preferences';
+
+        if (this.isSyncing(syncId, siteId)) {
+            // There's already a sync ongoing, return the promise.
+            return this.getOngoingSync(syncId, siteId);
+        }
+
+        const warnings = [];
+
+        this.logger.debug(`Try to sync user preferences`);
+
+        const syncPromise = this.userOffline.getChangedPreferences(siteId).then((preferences) => {
+            return this.utils.allPromises(preferences.map((preference) => {
+                return this.userProvider.getUserPreferenceOnline(preference.name, siteId).then((onlineValue) => {
+                    if (preference.onlinevalue != onlineValue) {
+                        // Prefernce was changed on web while the app was offline, do not sync.
+                        return this.userOffline.setPreference(preference.name, onlineValue, onlineValue, siteId);
+                    }
+
+                    return this.userProvider.setUserPreference(name, preference.value, siteId).catch((error) => {
+                        if (this.utils.isWebServiceError(error)) {
+                            warnings.push(this.textUtils.getErrorMessageFromError(error));
+                        } else {
+                            // Couldn't connect to server, reject.
+                            return Promise.reject(error);
+                        }
+                    });
+                });
+            }));
+        }).then(() => {
+            // All done, return the warnings.
+            return warnings;
+        });
+
+        return this.addOngoingSync(syncId, syncPromise, siteId);
+    }
+}
diff --git a/src/core/user/providers/user.ts b/src/core/user/providers/user.ts
index dd87758d8..085a73502 100644
--- a/src/core/user/providers/user.ts
+++ b/src/core/user/providers/user.ts
@@ -15,9 +15,11 @@
 import { Injectable } from '@angular/core';
 import { CoreFilepoolProvider } from '@providers/filepool';
 import { CoreLoggerProvider } from '@providers/logger';
-import { CoreSite } from '@classes/site';
+import { CoreSite, CoreSiteWSPreSets } from '@classes/site';
 import { CoreSitesProvider, CoreSiteSchema } from '@providers/sites';
 import { CoreUtilsProvider } from '@providers/utils/utils';
+import { CoreAppProvider } from '@providers/app';
+import { CoreUserOfflineProvider } from './offline';
 
 /**
  * Service to provide user functionalities.
@@ -59,7 +61,8 @@ export class CoreUserProvider {
     protected logger;
 
     constructor(logger: CoreLoggerProvider, private sitesProvider: CoreSitesProvider, private utils: CoreUtilsProvider,
-            private filepoolProvider: CoreFilepoolProvider) {
+            private filepoolProvider: CoreFilepoolProvider, private appProvider: CoreAppProvider,
+            private userOffline: CoreUserOfflineProvider) {
         this.logger = logger.getInstance('CoreUserProvider');
         this.sitesProvider.registerSiteSchema(this.siteSchema);
     }
@@ -272,6 +275,67 @@ export class CoreUserProvider {
         });
     }
 
+    /**
+     * Get a user preference (online or offline).
+     *
+     * @param {string} name Name of the preference.
+     * @param {string} [siteId] Site Id. If not defined, use current site.
+     * @return {string} Preference value or null if preference not set.
+     */
+    getUserPreference(name: string, siteId?: string): Promise<string> {
+        siteId = siteId || this.sitesProvider.getCurrentSiteId();
+
+        return this.userOffline.getPreference(name, siteId).catch(() => {
+            return null;
+        }).then((preference) => {
+            if (preference && !this.appProvider.isOnline()) {
+                // Offline, return stored value.
+                return preference.value;
+            }
+
+            return this.getUserPreferenceOnline(name, siteId).then((wsValue) => {
+                if (preference && preference.value != preference.onlinevalue && preference.onlinevalue == wsValue) {
+                    // Sync is pending for this preference, return stored value.
+                    return preference.value;
+                }
+
+                return this.userOffline.setPreference(name, wsValue, wsValue).then(() => {
+                    return wsValue;
+                });
+            });
+        });
+    }
+
+    /**
+     * Get cache key for a user preference WS call.
+     *
+     * @param {string} name Preference name.
+     * @return {string} Cache key.
+     */
+    protected getUserPreferenceCacheKey(name: string): string {
+        return this.ROOT_CACHE_KEY + 'preference:' + name;
+    }
+
+    /**
+     * Get a user preference online.
+     *
+     * @param {string} name Name of the preference.
+     * @param {string} [siteId] Site Id. If not defined, use current site.
+     * @return {string} Preference value or null if preference not set.
+     */
+    getUserPreferenceOnline(name: string, siteId?: string): Promise<string> {
+        return this.sitesProvider.getSite(siteId).then((site) => {
+            const data = { name };
+            const preSets: CoreSiteWSPreSets = {
+                cacheKey: this.getUserPreferenceCacheKey(data.name)
+            };
+
+            return site.read('core_user_get_user_preferences', data, preSets).then((result) => {
+                return result.preferences[0] ? result.preferences[0].value : null;
+            });
+        });
+    }
+
     /**
      * Invalidates user WS calls.
      *
@@ -298,6 +362,19 @@ export class CoreUserProvider {
         });
     }
 
+    /**
+     * Invalidate user preference.
+     *
+     * @param {string} name Name of the preference.
+     * @param {string} [siteId] Site Id. If not defined, use current site.
+     * @return {Promise<any>} Promise resolved when the data is invalidated.
+     */
+    invalidateUserPreference(name: string, siteId?: string): Promise<any> {
+        return this.sitesProvider.getSite(siteId).then((site) => {
+            return site.invalidateWsCacheForKey(this.getUserPreferenceCacheKey(name));
+        });
+    }
+
     /**
      * Check if course participants is disabled in a certain site.
      *
@@ -455,6 +532,45 @@ export class CoreUserProvider {
         return Promise.all(promises);
     }
 
+    /**
+     * Set a user preference (online or offline).
+     *
+     * @param {string} name Name of the preference.
+     * @param {string} value Value of the preference.
+     * @param {string} [siteId] Site ID. If not defined, current site.
+     * @return {Promise<any>} Promise resolved on success.
+     */
+    setUserPreference(name: string, value: string, siteId?: string): Promise<any> {
+        siteId = siteId || this.sitesProvider.getCurrentSiteId();
+
+        let isOnline = this.appProvider.isOnline();
+        let promise: Promise<any>;
+
+        if (isOnline) {
+            const preferences = [{type: name, value}];
+            promise = this.updateUserPreferences(preferences, undefined, undefined, siteId).catch((error) => {
+                // Preference not saved online.
+                isOnline = false;
+
+                return Promise.reject(error);
+            });
+        } else {
+            promise = Promise.resolve();
+        }
+
+        return promise.finally(() => {
+            // Update stored online value if saved online.
+            const onlineValue = isOnline ? value : undefined;
+
+            return Promise.all([
+                this.userOffline.setPreference(name, value, onlineValue),
+                this.invalidateUserPreference(name).catch(() => {
+                    // Ignore error.
+                })
+            ]);
+        });
+    }
+
     /**
      * Update a preference for a user.
      *
@@ -478,13 +594,14 @@ export class CoreUserProvider {
     /**
      * Update some preferences for a user.
      *
-     * @param  {any} preferences                List of preferences.
+     * @param  {{name: string, value: string}[]} preferences List of preferences.
      * @param  {boolean} [disableNotifications] Whether to disable all notifications. Undefined to not update this value.
      * @param  {number} [userId]                User ID. If not defined, site's current user.
      * @param  {string} [siteId]                Site ID. If not defined, current site.
      * @return {Promise<any>}                   Promise resolved if success.
      */
-    updateUserPreferences(preferences: any, disableNotifications: boolean, userId?: number, siteId?: string): Promise<any> {
+    updateUserPreferences(preferences: {type: string, value: string}[], disableNotifications?: boolean, userId?: number,
+            siteId?: string): Promise<any> {
         return this.sitesProvider.getSite(siteId).then((site) => {
             userId = userId || site.getUserId();
 
diff --git a/src/core/user/user.module.ts b/src/core/user/user.module.ts
index d2886ffe3..845f2179e 100644
--- a/src/core/user/user.module.ts
+++ b/src/core/user/user.module.ts
@@ -26,6 +26,10 @@ import { CoreUserParticipantsCourseOptionHandler } from './providers/course-opti
 import { CoreUserParticipantsLinkHandler } from './providers/participants-link-handler';
 import { CoreCourseOptionsDelegate } from '@core/course/providers/options-delegate';
 import { CoreUserComponentsModule } from './components/components.module';
+import { CoreCronDelegate } from '@providers/cron';
+import { CoreUserOfflineProvider } from './providers/offline';
+import { CoreUserSyncProvider } from './providers/sync';
+import { CoreUserSyncCronHandler } from './providers/sync-cron-handler';
 
 // List of providers (without handlers).
 export const CORE_USER_PROVIDERS: any[] = [
@@ -33,6 +37,8 @@ export const CORE_USER_PROVIDERS: any[] = [
     CoreUserProfileFieldDelegate,
     CoreUserProvider,
     CoreUserHelperProvider,
+    CoreUserOfflineProvider,
+    CoreUserSyncProvider
 ];
 
 @NgModule({
@@ -46,10 +52,13 @@ export const CORE_USER_PROVIDERS: any[] = [
         CoreUserProfileFieldDelegate,
         CoreUserProvider,
         CoreUserHelperProvider,
+        CoreUserOfflineProvider,
+        CoreUserSyncProvider,
         CoreUserProfileMailHandler,
         CoreUserProfileLinkHandler,
         CoreUserParticipantsCourseOptionHandler,
-        CoreUserParticipantsLinkHandler
+        CoreUserParticipantsLinkHandler,
+        CoreUserSyncCronHandler,
     ]
 })
 export class CoreUserModule {
@@ -57,12 +66,14 @@ export class CoreUserModule {
             eventsProvider: CoreEventsProvider, sitesProvider: CoreSitesProvider, userProvider: CoreUserProvider,
             contentLinksDelegate: CoreContentLinksDelegate, userLinkHandler: CoreUserProfileLinkHandler,
             courseOptionHandler: CoreUserParticipantsCourseOptionHandler, linkHandler: CoreUserParticipantsLinkHandler,
-            courseOptionsDelegate: CoreCourseOptionsDelegate) {
+            courseOptionsDelegate: CoreCourseOptionsDelegate, cronDelegate: CoreCronDelegate,
+            syncHandler: CoreUserSyncCronHandler) {
 
         userDelegate.registerHandler(userProfileMailHandler);
         courseOptionsDelegate.registerHandler(courseOptionHandler);
         contentLinksDelegate.registerHandler(userLinkHandler);
         contentLinksDelegate.registerHandler(linkHandler);
+        cronDelegate.register(syncHandler);
 
         eventsProvider.on(CoreEventsProvider.USER_DELETED, (data) => {
             // Search for userid in params.