diff --git a/src/lib/components/Keyboard.ts b/src/lib/components/Keyboard.ts
index cc5479dd..76abcfdd 100644
--- a/src/lib/components/Keyboard.ts
+++ b/src/lib/components/Keyboard.ts
@@ -118,6 +118,7 @@ class SimpleKeyboard {
      * @property {function(input: string):string} onChange Executes the callback function on input change. Returns the current input’s string.
      * @property {function} onRender Executes the callback function every time simple-keyboard is rendered (e.g: when you change layouts).
      * @property {function} onInit Executes the callback function once simple-keyboard is rendered for the first time (on initialization).
+     * @property {function(keyboard: Keyboard):void} beforeInputUpdate Perform an action before any input change
      * @property {function(inputs: object):object} onChangeAll Executes the callback function on input change. Returns the input object with all defined inputs.
      * @property {boolean} useButtonTag Render buttons as a button element instead of a div element.
      * @property {boolean} disableCaretPositioning A prop to ensure characters are always be added/removed at the end of the string.
@@ -393,6 +394,13 @@ class SimpleKeyboard {
             candidateStr = selectedCandidate.normalize("NFD");
           }
 
+          /**
+           * Perform an action before any input change
+           */
+          if (typeof this.options.beforeInputUpdate === "function") {
+            this.options.beforeInputUpdate(this);
+          }
+
           const currentInput = this.getInput(this.options.inputName, true);
           const initialCaretPosition = this.getCaretPositionEnd() || 0;
           const inputSubstr =
@@ -458,6 +466,13 @@ class SimpleKeyboard {
      */
     if (!this.input[inputName]) this.input[inputName] = "";
 
+    /**
+     * Perform an action before any input change
+     */
+    if (typeof this.options.beforeInputUpdate === "function") {
+      this.options.beforeInputUpdate(this);
+    }
+
     /**
      * Calculating new input
      */
diff --git a/src/lib/components/tests/CandidateBox.test.js b/src/lib/components/tests/CandidateBox.test.js
index 390991a0..98e89d1b 100644
--- a/src/lib/components/tests/CandidateBox.test.js
+++ b/src/lib/components/tests/CandidateBox.test.js
@@ -332,98 +332,133 @@ it('CandidateBox show not be called if keyboard.candidateBox is undefined upon s
 });
 
 it('CandidateBox selection should trigger onChange', () => {
-    const keyboard = new Keyboard({
-      layout: {
-        default: [
-          "a b {bksp}"
-        ]
-      },
-      layoutCandidates: {
-        a: "1 2 3 4 5 6"
-      },
-      onChange: jest.fn(),
-      onChangeAll: jest.fn()
-    });
-  
-    let candidateBoxOnItemSelected;
-    
-    const onSelect = jest.fn().mockImplementation((selectedCandidate) => {
-      candidateBoxOnItemSelected(selectedCandidate);
-      keyboard.candidateBox.destroy();
-    });
-  
-    const candidateBoxRenderFn = keyboard.candidateBox.renderPage;
-    
-    jest.spyOn(keyboard.candidateBox, "renderPage").mockImplementation((params) => {
-      candidateBoxOnItemSelected = params.onItemSelected;
-      params.onItemSelected = onSelect;
-      candidateBoxRenderFn(params);
-    });
-  
-    keyboard.getButtonElement("a").click();
-    keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
-  
-    expect(keyboard.options.onChange.mock.calls[0][0]).toBe("a");
-    expect(keyboard.options.onChangeAll.mock.calls[0][0]).toMatchObject({"default": "a"});
-
-    expect(keyboard.options.onChange.mock.calls[1][0]).toBe("1");
-    expect(keyboard.options.onChangeAll.mock.calls[1][0]).toMatchObject({"default": "1"});
-    keyboard.destroy();
+  const keyboard = new Keyboard({
+    layout: {
+      default: [
+        "a b {bksp}"
+      ]
+    },
+    layoutCandidates: {
+      a: "1 2 3 4 5 6"
+    },
+    onChange: jest.fn(),
+    onChangeAll: jest.fn()
   });
 
-  it('CandidateBox normalization will work', () => {
-    const keyboard = new Keyboard({
-      layout: {
-        default: [
-          "a b {bksp}"
-        ]
-      },
-      layoutCandidates: {
-        a: "신"
-      },
-      onChange: jest.fn(),
-      onChangeAll: jest.fn()
-    });
+  let candidateBoxOnItemSelected;
   
-    let candidateBoxOnItemSelected;
-    
-    const onSelect = jest.fn().mockImplementation((selectedCandidate) => {
-      candidateBoxOnItemSelected(selectedCandidate);
-      keyboard.candidateBox.destroy();
-    });
+  const onSelect = jest.fn().mockImplementation((selectedCandidate) => {
+    candidateBoxOnItemSelected(selectedCandidate);
+    keyboard.candidateBox.destroy();
+  });
+
+  const candidateBoxRenderFn = keyboard.candidateBox.renderPage;
   
-    const candidateBoxRenderFn = keyboard.candidateBox.renderPage;
-    
-    jest.spyOn(keyboard.candidateBox, "renderPage").mockImplementation((params) => {
-      candidateBoxOnItemSelected = params.onItemSelected;
-      params.onItemSelected = onSelect;
-      candidateBoxRenderFn(params);
-    });
+  jest.spyOn(keyboard.candidateBox, "renderPage").mockImplementation((params) => {
+    candidateBoxOnItemSelected = params.onItemSelected;
+    params.onItemSelected = onSelect;
+    candidateBoxRenderFn(params);
+  });
+
+  keyboard.getButtonElement("a").click();
+  keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
+
+  expect(keyboard.options.onChange.mock.calls[0][0]).toBe("a");
+  expect(keyboard.options.onChangeAll.mock.calls[0][0]).toMatchObject({"default": "a"});
+
+  expect(keyboard.options.onChange.mock.calls[1][0]).toBe("1");
+  expect(keyboard.options.onChangeAll.mock.calls[1][0]).toMatchObject({"default": "1"});
+  keyboard.destroy();
+});
+
+it('CandidateBox selection should trigger beforeInputChange', () => {
+  const keyboard = new Keyboard({
+    layout: {
+      default: [
+        "a b {bksp}"
+      ]
+    },
+    layoutCandidates: {
+      a: "1 2 3 4 5 6"
+    },
+    beforeInputUpdate: jest.fn(),
+  });
+
+  let candidateBoxOnItemSelected;
   
-    keyboard.getButtonElement("a").click();
-    keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
+  const onSelect = jest.fn().mockImplementation((selectedCandidate) => {
+    candidateBoxOnItemSelected(selectedCandidate);
+    keyboard.candidateBox.destroy();
+  });
+
+  const candidateBoxRenderFn = keyboard.candidateBox.renderPage;
   
-    expect(keyboard.options.onChange.mock.calls[0][0]).toBe("a");
-    expect(keyboard.options.onChangeAll.mock.calls[0][0]).toMatchObject({"default": "a"});
+  jest.spyOn(keyboard.candidateBox, "renderPage").mockImplementation((params) => {
+    candidateBoxOnItemSelected = params.onItemSelected;
+    params.onItemSelected = onSelect;
+    candidateBoxRenderFn(params);
+  });
 
-    // Selected candidate will be normalized
-    expect(keyboard.options.onChange.mock.calls[1][0]).toBe("신");
-    expect(keyboard.options.onChange.mock.calls[1][0].length).toBe(3);
-    expect(keyboard.options.onChangeAll.mock.calls[1][0]).toMatchObject({"default": "신"});
+  keyboard.getButtonElement("a").click();
+  keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
 
-    // Selected candidate will not be normalized
-    keyboard.clearInput();
-    keyboard.setOptions({ disableCandidateNormalization: true });
+  expect(keyboard.options.beforeInputUpdate.mock.calls[0][0]).toMatchObject(keyboard);
+  keyboard.destroy();
+});
 
-    keyboard.getButtonElement("a").click();
-    keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
+it('CandidateBox normalization will work', () => {
+  const keyboard = new Keyboard({
+    layout: {
+      default: [
+        "a b {bksp}"
+      ]
+    },
+    layoutCandidates: {
+      a: "신"
+    },
+    onChange: jest.fn(),
+    onChangeAll: jest.fn()
+  });
+
+  let candidateBoxOnItemSelected;
   
-    expect(keyboard.options.onChange.mock.calls[2][0]).toBe("a");
-    expect(keyboard.options.onChangeAll.mock.calls[2][0]).toMatchObject({"default": "a"});
+  const onSelect = jest.fn().mockImplementation((selectedCandidate) => {
+    candidateBoxOnItemSelected(selectedCandidate);
+    keyboard.candidateBox.destroy();
+  });
 
-    expect(keyboard.options.onChange.mock.calls[3][0]).toBe("신");
-    expect(keyboard.options.onChange.mock.calls[3][0].length).toBe(1);
-    expect(keyboard.options.onChangeAll.mock.calls[3][0]).toMatchObject({"default": "신"});
+  const candidateBoxRenderFn = keyboard.candidateBox.renderPage;
+  
+  jest.spyOn(keyboard.candidateBox, "renderPage").mockImplementation((params) => {
+    candidateBoxOnItemSelected = params.onItemSelected;
+    params.onItemSelected = onSelect;
+    candidateBoxRenderFn(params);
+  });
 
-    keyboard.destroy();
-  });
\ No newline at end of file
+  keyboard.getButtonElement("a").click();
+  keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
+
+  expect(keyboard.options.onChange.mock.calls[0][0]).toBe("a");
+  expect(keyboard.options.onChangeAll.mock.calls[0][0]).toMatchObject({"default": "a"});
+
+  // Selected candidate will be normalized
+  expect(keyboard.options.onChange.mock.calls[1][0]).toBe("신");
+  expect(keyboard.options.onChange.mock.calls[1][0].length).toBe(3);
+  expect(keyboard.options.onChangeAll.mock.calls[1][0]).toMatchObject({"default": "신"});
+
+  // Selected candidate will not be normalized
+  keyboard.clearInput();
+  keyboard.setOptions({ disableCandidateNormalization: true });
+
+  keyboard.getButtonElement("a").click();
+  keyboard.candidateBox.candidateBoxElement.querySelector("li").click();
+
+  expect(keyboard.options.onChange.mock.calls[2][0]).toBe("a");
+  expect(keyboard.options.onChangeAll.mock.calls[2][0]).toMatchObject({"default": "a"});
+
+  expect(keyboard.options.onChange.mock.calls[3][0]).toBe("신");
+  expect(keyboard.options.onChange.mock.calls[3][0].length).toBe(1);
+  expect(keyboard.options.onChangeAll.mock.calls[3][0]).toMatchObject({"default": "신"});
+
+  keyboard.destroy();
+});
\ No newline at end of file
diff --git a/src/lib/components/tests/Keyboard.test.js b/src/lib/components/tests/Keyboard.test.js
index bd372dff..ece2828b 100644
--- a/src/lib/components/tests/Keyboard.test.js
+++ b/src/lib/components/tests/Keyboard.test.js
@@ -218,6 +218,19 @@ it('Keyboard onChange will work', () => {
   expect(output).toBe("q");
 });
 
+it('Keyboard beforeInputChange will work', () => {
+  const mockBeforeInputUpdate = jest.fn();
+  
+  const keyboard = new Keyboard({
+    beforeInputUpdate: mockBeforeInputUpdate,
+    useMouseEvents: true
+  });
+
+  keyboard.getButtonElement("q").onclick();
+
+  expect(mockBeforeInputUpdate).toHaveBeenCalledWith(keyboard);
+});
+
 it('Keyboard onChangeAll will work', () => {
     let output;
 
diff --git a/src/lib/interfaces.ts b/src/lib/interfaces.ts
index cba5aa9f..a7b735d0 100644
--- a/src/lib/interfaces.ts
+++ b/src/lib/interfaces.ts
@@ -291,6 +291,11 @@ export interface KeyboardOptions {
      */
     onKeyReleased?: (button: string, e?: MouseEvent) => any;
 
+    /**
+     * Executes the callback function before an input is about to be updated
+     */
+    beforeInputUpdate?: (instance: SimpleKeyboard) => void;
+
     /**
      * Module options can have any format
      */