diff --git a/docling/datamodel/document.py b/docling/datamodel/document.py
index 5bb0352c..984cf02b 100644
--- a/docling/datamodel/document.py
+++ b/docling/datamodel/document.py
@@ -376,8 +376,13 @@ class _DocumentConversionInput(BaseModel):
             mime = FormatToMimeType[InputFormat.JSON_DOCLING][0]
         elif ext in FormatToExtensions[InputFormat.PDF]:
             mime = FormatToMimeType[InputFormat.PDF][0]
-        elif ext in FormatToExtentions[InputFormat.DOCX]:
+        elif ext in FormatToExtensions[InputFormat.DOCX]:
             mime = FormatToMimeType[InputFormat.DOCX][0]
+        elif ext in FormatToExtensions[InputFormat.PPTX]:
+            mime = FormatToMimeType[InputFormat.PPTX][0]
+        elif ext in FormatToExtensions[InputFormat.XLSX]:
+            mime = FormatToMimeType[InputFormat.XLSX][0]
+
         return mime
 
     @staticmethod