diff --git a/README.md b/README.md
index 6d39c47..737662c 100644
--- a/README.md
+++ b/README.md
@@ -10,3 +10,4 @@ Modify, and generate keyboard layout from single JSON file. Built with TypeScrip
   - `.klc` (Windows)
   - `.kcm` (Android Physical keyboard)
   - XKB (Linux)
+  - remap extension for Chrome OS (Manifest V3) (icons must be added manually / alphanumeric-shortcut keys will not work.)
\ No newline at end of file
diff --git a/cli.ts b/cli.ts
index 6ce0887..3fa2670 100644
--- a/cli.ts
+++ b/cli.ts
@@ -5,6 +5,8 @@ import { generateKeylayout } from "./generateKeylayout"
 import { generateKlc } from "./generateKlc"
 import { generateXkb } from "./generateXkb"
 import { generateKcm } from "./generateKcm"
+import { generateChr_background } from "./generateChr_background"
+import { generateChr_manifest } from "./generateChr_manifest"
 import { fixUnicode } from "./utils"
 
 // eslint-disable-next-line @typescript-eslint/no-var-requires
@@ -94,4 +96,22 @@ const choices = filenames.map((filename) => ({
       console.error(e)
       process.exit(1)
     }
+
+    // Chr___OS
+    try {
+      const layoutName = response.input.split(".").slice(0, -1).join(".")
+      const dir = `output/${layoutName}/${jsonInput.os.windows.installerName.toLowerCase()}`
+      if (!fs.existsSync(dir)){
+              fs.mkdirSync(dir);
+      }
+      const outputManifest = dir+`/manifest.json`
+      await generateChr_manifest(jsonInput, outputManifest)
+      console.log(`Output : ${outputManifest}`)
+      const outputBackground = dir+`/background.js`
+      await generateChr_background(jsonInput, outputBackground)
+      console.log(`Output : ${outputBackground}`)
+    } catch (e) {
+      console.error(e)
+      process.exit(1)
+    }
   })()
diff --git a/generateChr_background.ts b/generateChr_background.ts
new file mode 100644
index 0000000..6e1a125
--- /dev/null
+++ b/generateChr_background.ts
@@ -0,0 +1,192 @@
+import {
+  plainToClass
+} from "class-transformer"
+import {
+  validate
+} from "class-validator"
+import fs from "fs"
+import {
+  Layout,
+  WindowsAttributes
+} from "./main"
+
+export async function generateChr_background(
+  content: Record < string, unknown > ,
+  outputPath: string,
+): Promise < void > {
+  const layout = plainToClass(Layout, content)
+  const errors = await validate(layout)
+
+  if (errors.length) {
+    throw new Error(errors.map((e) => e.toString()).join(", "))
+  }
+
+  const windowsErrors = await validate(
+    plainToClass(WindowsAttributes, layout.os.windows),
+  )
+
+  if (windowsErrors.length) {
+    throw new Error(windowsErrors.map((e) => e.toString()).join(", "))
+  }
+
+  function toCheck(str: string) {
+    // let hex, i
+    // let result = ""
+    // for (i = 0; i < str.length; i++) {
+    //   hex = str.charCodeAt(i).toString(16)
+    //   result += "\\u" + ("0000" + hex).slice(-4)
+    // }
+    return str.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
+  }
+
+  const klfDefaultLayout = {
+    "1": "Digit1",
+    "2": "Digit2",
+    "3": "Digit3",
+    "4": "Digit4",
+    "5": "Digit5",
+    "6": "Digit6",
+    "7": "Digit7",
+    "8": "Digit8",
+    "9": "Digit9",
+    "0": "Digit0",
+    "-": "Minus",
+    "=": "Equal",
+    "`": "Backquote",
+    q: "KeyQ",
+    w: "KeyW",
+    e: "KeyE",
+    r: "KeyR",
+    t: "KeyT",
+    y: "KeyY",
+    u: "KeyU",
+    i: "KeyI",
+    o: "KeyO",
+    p: "KeyP",
+    "[": "BracketLeft",
+    "]": "BracketRight",
+    a: "KeyA",
+    s: "KeyS",
+    d: "KeyD",
+    f: "KeyF",
+    g: "KeyG",
+    h: "KeyH",
+    j: "KeyJ",
+    k: "KeyK",
+    l: "KeyL",
+    ";": "Semicolon",
+    "'": "Quote",
+    "\\": "Backslash",
+    z: "KeyZ",
+    x: "KeyX",
+    c: "KeyC",
+    v: "KeyV",
+    b: "KeyB",
+    n: "KeyN",
+    m: "KeyM",
+    ",": "Comma",
+    ".": "Period",
+    "/": "Slash",
+    " ": "Space",
+    KPDL: "NumpadDecimal",
+  }
+
+  const lines = `/*# License: ${layout.license}
+Generated via github.com/Manoonchai/kiimo
+*/
+var AltGr = { PLAIN: "plain", ALTERNATE: "alternate" };
+var Shift = { PLAIN: "plain", SHIFTED: "shifted" };
+
+var contextID = -1;
+var altGrState = AltGr.PLAIN;
+var shiftState = Shift.PLAIN;
+var lastRemappedKeyEvent = undefined;
+
+var lut = {`
+
+const endLines = `
+};
+
+
+chrome.input.ime.onFocus.addListener(function(context) {
+  contextID = context.contextID;
+});
+
+function updateAltGrState(keyData) {
+  altGrState = (keyData.code == "AltRight") ? ((keyData.type == "keydown") ? AltGr.ALTERNATE : AltGr.PLAIN)
+                                              : altGrState;
+}
+
+function updateShiftState(keyData) {
+  shiftState = ((keyData.shiftKey && !(keyData.capsLock)) || (!(keyData.shiftKey) && keyData.capsLock)) ? 
+                 Shift.SHIFTED : Shift.PLAIN;
+}
+
+function isPureModifier(keyData) {
+  return (keyData.key == "Shift") || (keyData.key == "Ctrl") || (keyData.key == "Alt");
+}
+
+function isRemappedEvent(keyData) {
+  // hack, should check for a sender ID (to be added to KeyData)
+  return lastRemappedKeyEvent != undefined &&
+         (lastRemappedKeyEvent.key == keyData.key &&
+          lastRemappedKeyEvent.code == keyData.code &&
+          lastRemappedKeyEvent.type == keyData.type
+         ); // requestID would be different so we are not checking for it  
+}
+
+
+chrome.input.ime.onKeyEvent.addListener(
+    function(engineID, keyData) {
+      var handled = false;
+      
+      if (isRemappedEvent(keyData)) {
+        lastRemappedKeyEvent = undefined;
+        return handled;
+      }
+
+      updateAltGrState(keyData);
+      updateShiftState(keyData);
+                
+      if (lut[keyData.code]) {
+        //avoid hell key:process loop
+        if (keyData.ctrlKey === true && keyData.code != "Space") {
+            return;
+        }
+          var remappedKeyData = keyData;
+          remappedKeyData.key = lut[keyData.code][altGrState][shiftState];
+          remappedKeyData.code = lut[keyData.code].code;
+        
+        if (chrome.input.ime.sendKeyEvents != undefined) {
+          chrome.input.ime.sendKeyEvents({"contextID": contextID, "keyData": [remappedKeyData]});
+          handled = true;
+          lastRemappedKeyEvent = remappedKeyData;
+        } else if (keyData.type == "keydown" && !isPureModifier(keyData)) {
+          chrome.input.ime.commitText({"contextID": contextID, "text": remappedKeyData.key});
+          handled = true;
+        }
+      }
+      
+      return handled;
+});
+`
+
+  const layoutLines = [""]
+  Object.entries(klfDefaultLayout).forEach(([key, value]) => {
+    const extensions =
+      `: { "plain": {"plain": "${toCheck(layout.keys[key][0])}"` +
+      `, "shifted": "${toCheck(layout.keys[key][1])}"}` +
+      `, "alternate": {"plain": "${toCheck(layout.keys[key][3])}"` +
+      `, "shifted":"${toCheck(layout.keys[key][5])}"}, ` +
+      `"code": "${value}"},`
+
+    layoutLines.push([`"${value}"`, ...extensions].join(""))
+  })
+
+  fs.writeFileSync(
+    outputPath,
+    [lines, layoutLines.join("\n"),endLines].join(""), {
+      encoding: "utf8",
+    },
+  )
+}
\ No newline at end of file
diff --git a/generateChr_manifest.ts b/generateChr_manifest.ts
new file mode 100644
index 0000000..4291928
--- /dev/null
+++ b/generateChr_manifest.ts
@@ -0,0 +1,67 @@
+import { plainToClass } from "class-transformer"
+import { validate } from "class-validator"
+import fs from "fs"
+import { Layout, WindowsAttributes } from "./main"
+
+export async function generateChr_manifest(
+  content: Record<string, unknown>,
+  outputPath: string,
+): Promise<void> {
+  const layout = plainToClass(Layout, content)
+  const errors = await validate(layout)
+
+  if (errors.length) {
+    throw new Error(errors.map((e) => e.toString()).join(", "))
+  }
+
+  const windowsErrors = await validate(
+    plainToClass(WindowsAttributes, layout.os.windows),
+  )
+
+  if (windowsErrors.length) {
+    throw new Error(windowsErrors.map((e) => e.toString()).join(", "))
+  }
+
+  const chrLocales = {
+    Thai: "th",
+    Lao: "la",
+  }
+  
+  const lines = 
+`{
+  "name": "${layout.language} ${layout.name} v${layout.version}",
+  "version": "${layout.version}",
+  "manifest_version": 3,
+  "description": "${layout.language} ${layout.name} v${layout.version}",
+  "background": {
+    "service_worker": "background.js"
+  },
+  "icons": {
+    "16": "icon16.png",
+    "48": "icon48.png",
+    "128": "icon128.png"
+  },
+  "permissions": [
+    "input"
+  ],
+  "input_components": [
+    {
+      "name": "${layout.language} ${layout.name} v${layout.version}",
+      "type": "ime",
+      "id": "${chrLocales[layout.language as keyof typeof chrLocales]}_${layout.name.toLowerCase()}_remap",
+      "description": "${layout.language} ${layout.name} v${layout.version}",
+      "language": "${chrLocales[layout.language as keyof typeof chrLocales]}", 
+      "layouts": ["la(stea)"]
+    }
+  ]
+}`
+//"layouts": ["la(stea)"] due all embed-thai-layout lack of "level3(ralt_switch)", use laos instead.
+
+  fs.writeFileSync(
+    outputPath,
+    lines,
+    {
+      encoding: "utf8",
+    },
+  )
+}
diff --git a/input/Manoonchai_Laos.json b/input/Manoonchai_Lao.json
similarity index 96%
rename from input/Manoonchai_Laos.json
rename to input/Manoonchai_Lao.json
index 834342b..06e5771 100644
--- a/input/Manoonchai_Laos.json
+++ b/input/Manoonchai_Lao.json
@@ -1,12 +1,12 @@
 {
-  "name": "Manoonchai Laos Pali",
+  "name": "Manoonchai Lao-Pali",
   "version": "1.0",
-  "language": "Laos",
+  "language": "Lao",
   "layers": ["Base", "Shift", "Command", "AltGr", "Control", "ShiftAltGr"],
   "license": "MIT",
   "os": {
     "windows": {
-      "installerName": "LaosMnc",
+      "installerName": "LaoMnc",
       "company": "Manoonchai",
       "localeId": "00000454"
     }
diff --git a/output/Manoonchai/thaimnc/background.js b/output/Manoonchai/thaimnc/background.js
new file mode 100644
index 0000000..8464fd0
--- /dev/null
+++ b/output/Manoonchai/thaimnc/background.js
@@ -0,0 +1,125 @@
+/*# License: MIT
+Generated via github.com/Manoonchai/kiimo
+*/
+var AltGr = { PLAIN: "plain", ALTERNATE: "alternate" };
+var Shift = { PLAIN: "plain", SHIFTED: "shifted" };
+
+var contextID = -1;
+var altGrState = AltGr.PLAIN;
+var shiftState = Shift.PLAIN;
+var lastRemappedKeyEvent = undefined;
+
+var lut = {
+"Digit0": { "plain": {"plain": "0", "shifted": ")"}, "alternate": {"plain": "๐", "shifted":""}, "code": "Digit0"},
+"Digit1": { "plain": {"plain": "1", "shifted": "!"}, "alternate": {"plain": "๑", "shifted":""}, "code": "Digit1"},
+"Digit2": { "plain": {"plain": "2", "shifted": "@"}, "alternate": {"plain": "๒", "shifted":""}, "code": "Digit2"},
+"Digit3": { "plain": {"plain": "3", "shifted": "#"}, "alternate": {"plain": "๓", "shifted":""}, "code": "Digit3"},
+"Digit4": { "plain": {"plain": "4", "shifted": "$"}, "alternate": {"plain": "๔", "shifted":""}, "code": "Digit4"},
+"Digit5": { "plain": {"plain": "5", "shifted": "%"}, "alternate": {"plain": "๕", "shifted":""}, "code": "Digit5"},
+"Digit6": { "plain": {"plain": "6", "shifted": "^"}, "alternate": {"plain": "๖", "shifted":""}, "code": "Digit6"},
+"Digit7": { "plain": {"plain": "7", "shifted": "&"}, "alternate": {"plain": "๗", "shifted":""}, "code": "Digit7"},
+"Digit8": { "plain": {"plain": "8", "shifted": "*"}, "alternate": {"plain": "๘", "shifted":""}, "code": "Digit8"},
+"Digit9": { "plain": {"plain": "9", "shifted": "("}, "alternate": {"plain": "๙", "shifted":""}, "code": "Digit9"},
+"Minus": { "plain": {"plain": "-", "shifted": "_"}, "alternate": {"plain": "÷", "shifted":""}, "code": "Minus"},
+"Equal": { "plain": {"plain": "=", "shifted": "+"}, "alternate": {"plain": "×", "shifted":""}, "code": "Equal"},
+"Backquote": { "plain": {"plain": "`", "shifted": "~"}, "alternate": {"plain": "`", "shifted":""}, "code": "Backquote"},
+"KeyQ": { "plain": {"plain": "ใ", "shifted": "ฒ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyQ"},
+"KeyW": { "plain": {"plain": "ต", "shifted": "ฏ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyW"},
+"KeyE": { "plain": {"plain": "ห", "shifted": "ซ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyE"},
+"KeyR": { "plain": {"plain": "ล", "shifted": "ญ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyR"},
+"KeyT": { "plain": {"plain": "ส", "shifted": "ฟ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyT"},
+"KeyY": { "plain": {"plain": "ป", "shifted": "ฉ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyY"},
+"KeyU": { "plain": {"plain": "ั", "shifted": "ึ"}, "alternate": {"plain": "ฺ", "shifted":""}, "code": "KeyU"},
+"KeyI": { "plain": {"plain": "ก", "shifted": "ธ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyI"},
+"KeyO": { "plain": {"plain": "ิ", "shifted": "ฐ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyO"},
+"KeyP": { "plain": {"plain": "บ", "shifted": "ฎ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyP"},
+"BracketLeft": { "plain": {"plain": "็", "shifted": "ฆ"}, "alternate": {"plain": "[", "shifted":"{"}, "code": "BracketLeft"},
+"BracketRight": { "plain": {"plain": "ฬ", "shifted": "ฑ"}, "alternate": {"plain": "]", "shifted":"}"}, "code": "BracketRight"},
+"KeyA": { "plain": {"plain": "ง", "shifted": "ษ"}, "alternate": {"plain": "◌", "shifted":""}, "code": "KeyA"},
+"KeyS": { "plain": {"plain": "เ", "shifted": "ถ"}, "alternate": {"plain": "๏", "shifted":""}, "code": "KeyS"},
+"KeyD": { "plain": {"plain": "ร", "shifted": "แ"}, "alternate": {"plain": "๛", "shifted":""}, "code": "KeyD"},
+"KeyF": { "plain": {"plain": "น", "shifted": "ช"}, "alternate": {"plain": "฿", "shifted":""}, "code": "KeyF"},
+"KeyG": { "plain": {"plain": "ม", "shifted": "พ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyG"},
+"KeyH": { "plain": {"plain": "อ", "shifted": "ผ"}, "alternate": {"plain": "ํ", "shifted":""}, "code": "KeyH"},
+"KeyJ": { "plain": {"plain": "า", "shifted": "ำ"}, "alternate": {"plain": "ๅ", "shifted":""}, "code": "KeyJ"},
+"KeyK": { "plain": {"plain": "่", "shifted": "ข"}, "alternate": {"plain": "ฃ", "shifted":""}, "code": "KeyK"},
+"KeyL": { "plain": {"plain": "้", "shifted": "โ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyL"},
+"Semicolon": { "plain": {"plain": "ว", "shifted": "ภ"}, "alternate": {"plain": ";", "shifted":":"}, "code": "Semicolon"},
+"Quote": { "plain": {"plain": "ื", "shifted": "\""}, "alternate": {"plain": "'", "shifted":"\""}, "code": "Quote"},
+"Backslash": { "plain": {"plain": "ฯ", "shifted": "ฌ"}, "alternate": {"plain": "\\", "shifted":"|"}, "code": "Backslash"},
+"KeyZ": { "plain": {"plain": "ุ", "shifted": "ฤ"}, "alternate": {"plain": "ฦ", "shifted":""}, "code": "KeyZ"},
+"KeyX": { "plain": {"plain": "ไ", "shifted": "ฝ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyX"},
+"KeyC": { "plain": {"plain": "ท", "shifted": "ๆ"}, "alternate": {"plain": "๚", "shifted":""}, "code": "KeyC"},
+"KeyV": { "plain": {"plain": "ย", "shifted": "ณ"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyV"},
+"KeyB": { "plain": {"plain": "จ", "shifted": "๊"}, "alternate": {"plain": "", "shifted":""}, "code": "KeyB"},
+"KeyN": { "plain": {"plain": "ค", "shifted": "๋"}, "alternate": {"plain": "ฅ", "shifted":""}, "code": "KeyN"},
+"KeyM": { "plain": {"plain": "ี", "shifted": "์"}, "alternate": {"plain": "๎", "shifted":""}, "code": "KeyM"},
+"Comma": { "plain": {"plain": "ด", "shifted": "ศ"}, "alternate": {"plain": ",", "shifted":"<"}, "code": "Comma"},
+"Period": { "plain": {"plain": "ะ", "shifted": "ฮ"}, "alternate": {"plain": ".", "shifted":">"}, "code": "Period"},
+"Slash": { "plain": {"plain": "ู", "shifted": "?"}, "alternate": {"plain": "/", "shifted":"?"}, "code": "Slash"},
+"Space": { "plain": {"plain": " ", "shifted": " "}, "alternate": {"plain": " ", "shifted":" "}, "code": "Space"},
+"NumpadDecimal": { "plain": {"plain": ".", "shifted": ","}, "alternate": {"plain": ".", "shifted":"."}, "code": "NumpadDecimal"},
+};
+
+
+chrome.input.ime.onFocus.addListener(function(context) {
+  contextID = context.contextID;
+});
+
+function updateAltGrState(keyData) {
+  altGrState = (keyData.code == "AltRight") ? ((keyData.type == "keydown") ? AltGr.ALTERNATE : AltGr.PLAIN)
+                                              : altGrState;
+}
+
+function updateShiftState(keyData) {
+  shiftState = ((keyData.shiftKey && !(keyData.capsLock)) || (!(keyData.shiftKey) && keyData.capsLock)) ? 
+                 Shift.SHIFTED : Shift.PLAIN;
+}
+
+function isPureModifier(keyData) {
+  return (keyData.key == "Shift") || (keyData.key == "Ctrl") || (keyData.key == "Alt");
+}
+
+function isRemappedEvent(keyData) {
+  // hack, should check for a sender ID (to be added to KeyData)
+  return lastRemappedKeyEvent != undefined &&
+         (lastRemappedKeyEvent.key == keyData.key &&
+          lastRemappedKeyEvent.code == keyData.code &&
+          lastRemappedKeyEvent.type == keyData.type
+         ); // requestID would be different so we are not checking for it  
+}
+
+
+chrome.input.ime.onKeyEvent.addListener(
+    function(engineID, keyData) {
+      var handled = false;
+      
+      if (isRemappedEvent(keyData)) {
+        lastRemappedKeyEvent = undefined;
+        return handled;
+      }
+
+      updateAltGrState(keyData);
+      updateShiftState(keyData);
+                
+      if (lut[keyData.code]) {
+        //avoid hell key:process loop
+        if (keyData.ctrlKey === true && keyData.code != "Space") {
+            return;
+        }
+          var remappedKeyData = keyData;
+          remappedKeyData.key = lut[keyData.code][altGrState][shiftState];
+          remappedKeyData.code = lut[keyData.code].code;
+        
+        if (chrome.input.ime.sendKeyEvents != undefined) {
+          chrome.input.ime.sendKeyEvents({"contextID": contextID, "keyData": [remappedKeyData]});
+          handled = true;
+          lastRemappedKeyEvent = remappedKeyData;
+        } else if (keyData.type == "keydown" && !isPureModifier(keyData)) {
+          chrome.input.ime.commitText({"contextID": contextID, "text": remappedKeyData.key});
+          handled = true;
+        }
+      }
+      
+      return handled;
+});
diff --git a/output/Manoonchai/thaimnc/icon128.png b/output/Manoonchai/thaimnc/icon128.png
new file mode 100644
index 0000000..5f1bb3b
Binary files /dev/null and b/output/Manoonchai/thaimnc/icon128.png differ
diff --git a/output/Manoonchai/thaimnc/icon16.png b/output/Manoonchai/thaimnc/icon16.png
new file mode 100644
index 0000000..ea370f9
Binary files /dev/null and b/output/Manoonchai/thaimnc/icon16.png differ
diff --git a/output/Manoonchai/thaimnc/icon48.png b/output/Manoonchai/thaimnc/icon48.png
new file mode 100644
index 0000000..dfaa0b0
Binary files /dev/null and b/output/Manoonchai/thaimnc/icon48.png differ
diff --git a/output/Manoonchai/thaimnc/manifest.json b/output/Manoonchai/thaimnc/manifest.json
new file mode 100644
index 0000000..c8925b6
--- /dev/null
+++ b/output/Manoonchai/thaimnc/manifest.json
@@ -0,0 +1,27 @@
+{
+  "name": "Thai Manoonchai v1.0",
+  "version": "1.0",
+  "manifest_version": 3,
+  "description": "Thai Manoonchai v1.0",
+  "background": {
+    "service_worker": "background.js"
+  },
+  "icons": {
+    "16": "icon16.png",
+    "48": "icon48.png",
+    "128": "icon128.png"
+  },
+  "permissions": [
+    "input"
+  ],
+  "input_components": [
+    {
+      "name": "Thai Manoonchai v1.0",
+      "type": "ime",
+      "id": "th_manoonchai_remap",
+      "description": "Thai Manoonchai v1.0",
+      "language": "th", 
+      "layouts": ["la(stea)"]
+    }
+  ]
+}
\ No newline at end of file