diff --git a/src/markitdown/_markitdown.py b/src/markitdown/_markitdown.py
index 376c75c..a72a963 100644
--- a/src/markitdown/_markitdown.py
+++ b/src/markitdown/_markitdown.py
@@ -527,7 +527,16 @@ class XlsxConverter(HtmlConverter):
             return ""
         return colname
 
-    def convert(self, local_path, **kwargs) -> Union[None, DocumentConverterResult]:
+    def _clean_dataframe(self, df: pd.DataFrame) -> pd.DataFrame:
+        return (
+            df.rename(columns=lambda col: self._clean_colname(col))
+            .dropna(how="all", axis=1)
+            .dropna(how="all", axis=0)
+        )
+
+    def convert(
+        self, local_path, beautify: bool = True, **kwargs
+    ) -> Union[None, DocumentConverterResult]:
         # Bail if not a XLSX
         extension = kwargs.get("file_extension", "")
         if extension.lower() != ".xlsx":
@@ -535,14 +544,13 @@ class XlsxConverter(HtmlConverter):
 
         sheets = pd.read_excel(local_path, sheet_name=None)
         md_content = ""
-        for s in sheets:
-            md_content += f"## {s}\n"
-            sheet = sheets[s]
-            sheet.columns = list(map(self._clean_colname, sheet.columns))
+        for name, sheet in sheets.items():
+            md_content += f"## {name}\n"
+            df = self._clean_dataframe(sheet) if beautify else sheet
             html_content = (
-                sheet.dropna(how="all", axis=1)
-                .dropna(how="all", axis=0)
-                .to_html(index=False, na_rep="")
+                df.to_html(index=False, na_rep="")
+                if beautify
+                else df.to_html(index=False)
             )
             md_content += self._convert(html_content).text_content.strip() + "\n\n"
 
diff --git a/tests/test_markitdown.py b/tests/test_markitdown.py
index 2f061dc..bb666e9 100644
--- a/tests/test_markitdown.py
+++ b/tests/test_markitdown.py
@@ -42,6 +42,7 @@ XLSX_TEST_STRINGS = [
     "affc7dad-52dc-4b98-9b5d-51e65d8a8ad0",
 ]
 
+
 DOCX_TEST_STRINGS = [
     "314b0a30-5b04-470b-b9f7-eed2c2bec74a",
     "49e168b7-d2ae-407f-a055-2167576f39a1",
@@ -139,14 +140,18 @@ def test_markitdown_local() -> None:
     markitdown = MarkItDown()
 
     # Test XLSX processing
-    result = markitdown.convert(os.path.join(TEST_FILES_DIR, "test.xlsx"))
+    # XlsxConverter has an additional kwarg `beautify`, which defaults to True
+    result = markitdown.convert(
+        os.path.join(TEST_FILES_DIR, "test.xlsx"), beautify=False
+    )
+    result_cleaned = markitdown.convert(os.path.join(TEST_FILES_DIR, "test.xlsx"))
     # Check assertions
     for test_string in XLSX_TEST_STRINGS:
         text_content = result.text_content.replace("\\", "")
         assert test_string in text_content
     # Check negations
-    assert "Unnamed:" not in text_content
-    assert "NaN" not in text_content
+    assert "Unnamed:" not in result_cleaned.text_content
+    assert "NaN" not in result_cleaned.text_content
 
     # Test DOCX processing
     result = markitdown.convert(os.path.join(TEST_FILES_DIR, "test.docx"))