diff --git a/index.html b/index.html
index f0fd38c1..a59bdc13 100644
--- a/index.html
+++ b/index.html
@@ -1690,18 +1690,6 @@
             Generator settings:
           </p>
           <table>
-            <tr data-tip="Set what Generator should do on opening">
-              <td></td>
-              <td>Onload behavior</td>
-              <td>
-                <select id="onloadMap" data-stored="onloadMap">
-                  <option value="random" selected>Generate random map</option>
-                  <option value="saved">Open last saved map</option>
-                </select>
-              </td>
-              <td></td>
-            </tr>
-
             <tr
               data-tip="Set user interface size. Please note browser zoom also affects interface size (Ctrl + or Ctrl - to change)"
             >
@@ -1750,6 +1738,33 @@
               </td>
             </tr>
 
+            <tr data-tip="Set autosave interval in minutes. Set 0 to disable autosave. Map is saved to browser memory">
+              <td></td>
+              <td>Autosave interval</td>
+              <td>
+                <input
+                  id="autosaveIntervalInput"
+                  data-stored="autosaveInterval"
+                  type="range"
+                  min="0"
+                  max="60"
+                  step="1"
+                  value="15"
+                />
+              </td>
+              <td>
+                <input
+                  id="autosaveIntervalOutput"
+                  data-stored="autosaveInterval"
+                  type="number"
+                  min="0"
+                  max="60"
+                  step="1"
+                  value="15"
+                />
+              </td>
+            </tr>
+
             <tr data-tip="Select speech synthesis voice to pronounce generated names">
               <td></td>
               <td>Speaker voice</td>
@@ -3239,7 +3254,7 @@
                 style="margin-left: 0.1em"
               ></i>
             </div>
-            <iframe id="mfcgPreview" sandbox="allow-scripts allow-same-origin"></iframe>
+            <iframe id="mfcgPreview" sandbox="allow-same-origin"></iframe>
           </div>
         </div>
 
@@ -5797,7 +5812,7 @@
           </button>
           <button
             onclick="quickSave()"
-            data-tip="Save the project to browser storage. It can be unreliable"
+            data-tip="Save the project to browser storage. It will overwrite the latest autosave"
             data-shortcut="F6"
           >
             browser
@@ -7826,9 +7841,10 @@
     <script src="libs/d3.min.js"></script>
     <script src="libs/priority-queue.min.js"></script>
     <script src="libs/delaunator.min.js"></script>
+    <script src="libs/indexedDB.js"></script>
 
     <script src="utils/shorthands.js"></script>
-    <script src="utils/commonUtils.js"></script>
+    <script src="utils/commonUtils.js?v=1.89.29"></script>
     <script src="utils/arrayUtils.js"></script>
     <script src="utils/colorUtils.js"></script>
     <script src="utils/graphUtils.js?v=1.88.02"></script>
@@ -7866,7 +7882,7 @@
 
     <script src="modules/ui/general.js?v=1.87.03"></script>
     <script src="modules/ui/options.js?v=1.89.19"></script>
-    <script src="main.js?v=1.89.19"></script>
+    <script src="main.js?v=1.89.29"></script>
 
     <script defer src="modules/relief-icons.js"></script>
     <script defer src="modules/ui/style.js"></script>
@@ -7908,8 +7924,8 @@
     <script defer src="libs/rgbquant.min.js"></script>
     <script defer src="libs/jquery.ui.touch-punch.min.js"></script>
 
-    <script defer src="modules/io/save.js"></script>
-    <script defer src="modules/io/load.js?v=1.88.05"></script>
+    <script defer src="modules/io/save.js?v=1.89.29"></script>
+    <script defer src="modules/io/load.js?v=1.89.29"></script>
     <script defer src="modules/io/cloud.js"></script>
     <script defer src="modules/io/export.js?v=1.89.17"></script>
     <script defer src="modules/io/formats.js"></script>
diff --git a/libs/indexedDB.js b/libs/indexedDB.js
new file mode 100644
index 00000000..03e09182
--- /dev/null
+++ b/libs/indexedDB.js
@@ -0,0 +1,82 @@
+function waitForIndexedDB() {
+  return new Promise(resolve => {
+    const timer = setInterval(() => {
+      if (window.indexedDB) {
+        clearInterval(timer);
+        resolve();
+      }
+    }, 100);
+  });
+}
+
+function getValue(key) {
+  return new Promise((resolve, reject) => {
+    if (!window.indexedDB) {
+      reject(new Error("indexedDB not supported"));
+      return;
+    }
+
+    waitForIndexedDB().then(() => {
+      const request = window.indexedDB.open("d2", 1);
+
+      request.onsuccess = event => {
+        const db = event.target.result;
+        const transaction = db.transaction("s", "readonly");
+        const objectStore = transaction.objectStore("s");
+        const getRequest = objectStore.get(key);
+
+        getRequest.onsuccess = event => {
+          const value = (event.target.result && event.target.result.v) || null;
+          resolve(value);
+        };
+
+        getRequest.onerror = event => {
+          reject(new Error("indexedDB request error"));
+          console.log(event);
+        };
+      };
+
+      request.onerror = event => {
+        reject(new Error("indexedDB request error"));
+        console.log(event);
+      };
+    });
+  });
+}
+
+function setValue(key, value) {
+  return new Promise((resolve, reject) => {
+    if (!window.indexedDB) {
+      reject(new Error("indexedDB not supported"));
+      return;
+    }
+
+    waitForIndexedDB().then(() => {
+      const request = window.indexedDB.open("d2", 1);
+
+      request.onsuccess = event => {
+        const db = event.target.result;
+        const transaction = db.transaction("s", "readwrite");
+        const objectStore = transaction.objectStore("s");
+
+        objectStore.put({k: key, v: value});
+
+        transaction.oncomplete = () => {
+          resolve();
+        };
+
+        transaction.onerror = event => {
+          reject(new Error("indexedDB request error"));
+          console.log(event);
+        };
+      };
+
+      request.onerror = event => {
+        reject(new Error("indexedDB request error"));
+        console.log(event);
+      };
+    });
+  });
+}
+
+window.ldb = {get: getValue, set: setValue};
diff --git a/main.js b/main.js
index 5bff8d9a..9c49703d 100644
--- a/main.js
+++ b/main.js
@@ -221,8 +221,7 @@ oceanLayers
 document.addEventListener("DOMContentLoaded", async () => {
   if (!location.hostname) {
     const wiki = "https://github.com/Azgaar/Fantasy-Map-Generator/wiki/Run-FMG-locally";
-    alertMessage.innerHTML = /* html */ `Fantasy Map Generator cannot run serverless. Follow the <a href="${wiki}" target="_blank">instructions</a> on how you can
-      easily run a local web-server`;
+    alertMessage.innerHTML = /* html */ `Fantasy Map Generator cannot run serverless. Follow the <a href="${wiki}" target="_blank">instructions</a> on how you can easily run a local web-server`;
 
     $("#alert").dialog({
       resizable: false,
@@ -240,6 +239,7 @@ document.addEventListener("DOMContentLoaded", async () => {
     await checkLoadParameters();
   }
   restoreDefaultEvents(); // apply default viewbox events
+  initiateAutosave();
 });
 
 function hideLoading() {
@@ -280,35 +280,20 @@ async function checkLoadParameters() {
     return;
   }
 
-  // open latest map if option is active and map is stored
-  const loadLastMap = () =>
-    new Promise((resolve, reject) => {
-      ldb.get("lastMap", blob => {
-        if (blob) {
-          WARN && console.warn("Load last saved map");
-          try {
-            uploadMap(blob);
-            resolve();
-          } catch (error) {
-            reject(error);
-          }
-        } else {
-          reject("No map stored");
-        }
-      });
-    });
-
-  if (onloadMap.value === "saved") {
+  // check if there is a map saved to indexedDB
+  const blob = await ldb.get("lastMap");
+  if (blob) {
     try {
-      await loadLastMap();
+      WARN && console.warn("Loading last stored map");
+      uploadMap(blob);
     } catch (error) {
       ERROR && console.error(error);
       WARN && console.warn("Cannot load stored map, random map to be generated");
-      await generateMapOnLoad();
+      generateMapOnLoad();
     }
   } else {
     WARN && console.warn("Generate random map");
-    await generateMapOnLoad();
+    generateMapOnLoad();
   }
 }
 
diff --git a/modules/io/load.js b/modules/io/load.js
index cd1ed8c0..4d8fda2c 100644
--- a/modules/io/load.js
+++ b/modules/io/load.js
@@ -1,15 +1,13 @@
 "use strict";
 // Functions to load and parse .map files
 
-function quickLoad() {
-  ldb.get("lastMap", blob => {
-    if (blob) {
-      loadMapPrompt(blob);
-    } else {
-      tip("No map stored. Save map to storage first", true, "error", 2000);
-      ERROR && console.error("No map stored");
-    }
-  });
+async function quickLoad() {
+  const blob = ldb.get("lastMap");
+  if (blob) loadMapPrompt(blob);
+  else {
+    tip("No map stored. Save map to browser storage first", true, "error", 2000);
+    ERROR && console.error("No map stored");
+  }
 }
 
 async function loadFromDropbox() {
diff --git a/modules/io/save.js b/modules/io/save.js
index db303eff..8cdd5c03 100644
--- a/modules/io/save.js
+++ b/modules/io/save.js
@@ -3,8 +3,6 @@
 
 // prepare map data for saving
 function getMapData() {
-  TIME && console.time("createMapData");
-
   const date = new Date();
   const dateString = date.getFullYear() + "-" + (date.getMonth() + 1) + "-" + date.getDate();
   const license = "File can be loaded in azgaar.github.io/Fantasy-Map-Generator";
@@ -116,13 +114,13 @@ function getMapData() {
     fonts,
     markers
   ].join("\r\n");
-  TIME && console.timeEnd("createMapData");
   return mapData;
 }
 
 // Download .map file
 function dowloadMap() {
-  if (customization) return tip("Map cannot be saved when edit mode is active, please exit the mode and retry", false, "error");
+  if (customization)
+    return tip("Map cannot be saved when edit mode is active, please exit the mode and retry", false, "error");
   closeDialogs("#alert");
 
   const mapData = getMapData();
@@ -137,7 +135,8 @@ function dowloadMap() {
 }
 
 async function saveToDropbox() {
-  if (customization) return tip("Map cannot be saved when edit mode is active, please exit the mode and retry", false, "error");
+  if (customization)
+    return tip("Map cannot be saved when edit mode is active, please exit the mode and retry", false, "error");
   closeDialogs("#alert");
   const mapData = getMapData();
   const filename = getFileName() + ".map";
@@ -150,12 +149,36 @@ async function saveToDropbox() {
   }
 }
 
-function quickSave() {
-  if (customization) return tip("Map cannot be saved when edit mode is active, please exit the mode and retry", false, "error");
+async function initiateAutosave() {
+  const MINUTE = 60000; // munite in milliseconds
+  let lastSavedAt = Date.now();
+
+  async function autosave() {
+    const timeoutMinutes = byId("autosaveIntervalOutput").valueAsNumber;
+    if (!timeoutMinutes) return;
+
+    const diffInMinutes = (Date.now() - lastSavedAt) / MINUTE;
+    if (diffInMinutes < timeoutMinutes) return;
+    if (customization) return tip("Autosave: map cannot be saved in edit mode", false, "warning", 2000);
+
+    tip("Autosave: saving map...", false, "warning", 3000);
+    const mapData = getMapData();
+    const blob = new Blob([mapData], {type: "text/plain"});
+    await ldb.set("lastMap", blob);
+    console.log("Autosaved at", new Date().toLocaleTimeString());
+    lastSavedAt = Date.now();
+  }
+
+  setInterval(autosave, MINUTE / 2);
+}
+
+async function quickSave() {
+  if (customization)
+    return tip("Map cannot be saved when edit mode is active, please exit the mode first", false, "error");
 
   const mapData = getMapData();
   const blob = new Blob([mapData], {type: "text/plain"});
-  if (blob) ldb.set("lastMap", blob); // auto-save map
+  await ldb.set("lastMap", blob); // auto-save map
   tip("Map is saved to browser memory. Please also save as .map file to secure progress", true, "success", 2000);
 }
 
diff --git a/utils/commonUtils.js b/utils/commonUtils.js
index 49ab7754..456d8376 100644
--- a/utils/commonUtils.js
+++ b/utils/commonUtils.js
@@ -134,7 +134,11 @@ function isCtrlClick(event) {
 }
 
 function generateDate(from = 100, to = 1000) {
-  return new Date(rand(from, to), rand(12), rand(31)).toLocaleDateString("en", {year: "numeric", month: "long", day: "numeric"});
+  return new Date(rand(from, to), rand(12), rand(31)).toLocaleDateString("en", {
+    year: "numeric",
+    month: "long",
+    day: "numeric"
+  });
 }
 
 function getLongitude(x, decimals = 2) {
@@ -158,7 +162,8 @@ void (function () {
   const defaultOptions = {default: 1, step: 0.01, min: 0, max: 100, required: true};
 
   window.prompt = function (promptText = defaultText, options = defaultOptions, callback) {
-    if (options.default === undefined) return ERROR && console.error("Prompt: options object does not have default value defined");
+    if (options.default === undefined)
+      return ERROR && console.error("Prompt: options object does not have default value defined");
 
     const input = prompt.querySelector("#promptInput");
     prompt.querySelector("#promptText").innerHTML = promptText;
@@ -192,41 +197,3 @@ void (function () {
     prompt.style.display = "none";
   });
 })();
-
-// indexedDB; ldb object
-void (function () {
-  function e(t, o) {
-    return n
-      ? void (n.transaction("s").objectStore("s").get(t).onsuccess = function (e) {
-          var t = (e.target.result && e.target.result.v) || null;
-          o(t);
-        })
-      : void setTimeout(function () {
-          e(t, o);
-        }, 100);
-  }
-  var t = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
-  if (!t) return void ERROR && console.error("indexedDB not supported");
-  var n,
-    o = {k: "", v: ""},
-    r = t.open("d2", 1);
-  (r.onsuccess = function (e) {
-    n = this.result;
-  }),
-    (r.onerror = function (e) {
-      ERROR && console.error("indexedDB request error"), INFO && console.log(e);
-    }),
-    (r.onupgradeneeded = function (e) {
-      n = null;
-      var t = e.target.result.createObjectStore("s", {keyPath: "k"});
-      t.transaction.oncomplete = function (e) {
-        n = e.target.db;
-      };
-    }),
-    (window.ldb = {
-      get: e,
-      set: function (e, t) {
-        (o.k = e), (o.v = t), n.transaction("s", "readwrite").objectStore("s").put(o);
-      }
-    });
-})();
diff --git a/versioning.js b/versioning.js
index f93b9314..c2ac5389 100644
--- a/versioning.js
+++ b/versioning.js
@@ -1,7 +1,7 @@
 "use strict";
 
 // version and caching control
-const version = "1.89.28"; // generator version, update each time
+const version = "1.89.29"; // generator version, update each time
 
 {
   document.title += " v" + version;
@@ -28,6 +28,7 @@ const version = "1.89.28"; // generator version, update each time
 
       <ul>
         <strong>Latest changes:</strong>
+        <li>Autosave feature (in Options)</li>
         <li>Google translation support (in Options)</li>
         <li>Religions can be edited and redrawn like cultures</li>
         <li>Lock states, provinces, cultures, and religions from regeneration</li>
@@ -35,8 +36,6 @@ const version = "1.89.28"; // generator version, update each time
         <li>Data Charts screen</li>
         <li>Сultures and religions can have multiple parents in hierarchy tree</li>
         <li>Heightmap selection screen</li>
-        <li>Dialogs optimization for mobile</li>
-        <li>New heightmap template: Fractious</li>
       </ul>
 
       <p>Join our <a href="${discord}" target="_blank">Discord server</a> and <a href="${reddit}" target="_blank">Reddit community</a> to ask questions, share maps, discuss the Generator and Worlbuilding, report bugs and propose new features.</p>