diff --git a/docling/datamodel/document.py b/docling/datamodel/document.py
index 136428e8..0483dc2a 100644
--- a/docling/datamodel/document.py
+++ b/docling/datamodel/document.py
@@ -350,6 +350,16 @@ class _DocumentConversionInput(BaseModel):
             mime = FormatToMimeType[InputFormat.HTML][0]
         elif ext in FormatToExtensions[InputFormat.MD]:
             mime = FormatToMimeType[InputFormat.MD][0]
+
+        elif ext in FormatToExtensions[InputFormat.PDF]:
+            mime = FormatToMimeType[InputFormat.PDF][0]
+        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