diff --git a/apps/editor/src/__test__/unit/editor.spec.ts b/apps/editor/src/__test__/unit/editor.spec.ts
index a33a9d1fa3..b6deace1b3 100644
--- a/apps/editor/src/__test__/unit/editor.spec.ts
+++ b/apps/editor/src/__test__/unit/editor.spec.ts
@@ -61,6 +61,27 @@ describe('editor', () => {
       document.body.removeChild(container);
     });
 
+    describe('convertPosToMatchEditorMode', () => {
+      const mdPos: [number, number] = [2, 1];
+      const wwPos = 14;
+
+      it('should convert position to match editor mode', () => {
+        editor.setMarkdown('Hello World\nwelcome to the world');
+
+        editor.changeMode('wysiwyg');
+        expect(editor.convertPosToMatchEditorMode(mdPos)).toEqual([wwPos, wwPos]);
+
+        editor.changeMode('markdown');
+        expect(editor.convertPosToMatchEditorMode(wwPos)).toEqual([mdPos, mdPos]);
+      });
+
+      it('should occurs error when types of parameters is not matched', () => {
+        expect(() => {
+          editor.convertPosToMatchEditorMode(mdPos, wwPos);
+        }).toThrowError();
+      });
+    });
+
     it('setPlaceholder()', () => {
       editor.setPlaceholder('Please input text');
 
diff --git a/apps/editor/src/editorCore.ts b/apps/editor/src/editorCore.ts
index 85e5ad1e36..2b025790fa 100644
--- a/apps/editor/src/editorCore.ts
+++ b/apps/editor/src/editorCore.ts
@@ -43,6 +43,8 @@ import { sanitizeHTML } from './sanitizer/htmlSanitizer';
 import { createHTMLSchemaMap } from './wysiwyg/nodes/html';
 import { getHTMLRenderConvertors } from './markdown/htmlRenderConvertors';
 import { buildQuery } from './queries/queryManager';
+import { getEditorToMdPos, getMdToEditorPos } from './markdown/helper/pos';
+import { Pos } from '@t/toastmark';
 
 /**
  * ToastUIEditorCore
@@ -820,6 +822,33 @@ class ToastUIEditorCore {
       wwEditor: this.wwEditor.getElement(),
     };
   }
+
+  /**
+   * Convert position to match editor mode
+   * @param {number|Array.<number>} start - start position
+   * @param {number|Array.<number>} end - end position
+   * @param {string} mode - Editor mode name of want to match converted position to
+   */
+  convertPosToMatchEditorMode(start: EditorPos, end = start, mode = this.mode) {
+    const { doc } = this.mdEditor.view.state;
+    const isFromArray = Array.isArray(start);
+    const isToArray = Array.isArray(end);
+
+    let convertedFrom = start;
+    let convertedTo = end;
+
+    if (isFromArray !== isToArray) {
+      throw new Error('Types of arguments must be same');
+    }
+
+    if (mode === 'markdown' && !isFromArray && !isToArray) {
+      [convertedFrom, convertedTo] = getEditorToMdPos(doc, start as number, end as number);
+    } else if (mode === 'wysiwyg' && isFromArray && isToArray) {
+      [convertedFrom, convertedTo] = getMdToEditorPos(doc, start as Pos, end as Pos);
+    }
+
+    return [convertedFrom, convertedTo];
+  }
 }
 
 // // (Not an official API)