diff --git a/reports/export.py b/reports/export.py
index 1cd3d64..e75bed7 100644
--- a/reports/export.py
+++ b/reports/export.py
@@ -1,12 +1,29 @@
 from pathlib import Path
 
 
+class LineTransform:
+    """A post-processing step applied to every rendered report line."""
+
+    def apply(self, line: str) -> str:
+        raise NotImplementedError
+
+
+class StripTrailingWhitespace(LineTransform):
+    def apply(self, line: str) -> str:
+        return line.rstrip()
+
+
+DEFAULT_TRANSFORMS: list[LineTransform] = [StripTrailingWhitespace()]
+
+
 def render_rows(rows):
     for row in rows:
         yield f"{row['region']:<12} {row['orders']:>8} {row['note']}"
 
 
-def export_report(rows, out_path: Path) -> None:
+def export_report(rows, out_path: Path, transforms: list[LineTransform] = DEFAULT_TRANSFORMS) -> None:
     with out_path.open("w", encoding="utf-8") as fh:
         for line in render_rows(rows):
+            for transform in transforms:
+                line = transform.apply(line)
             fh.write(line + "\n")
diff --git a/tests/test_export.py b/tests/test_export.py
index 35fee65..2d44f86 100644
--- a/tests/test_export.py
+++ b/tests/test_export.py
@@ -5,3 +5,10 @@ def test_writes_one_line_per_row(tmp_path):
     out = tmp_path / "r.txt"
     export_report([{"region": "west", "orders": 3, "note": "ok"}], out)
     assert len(out.read_text().splitlines()) == 1
+
+
+def test_no_trailing_whitespace(tmp_path):
+    out = tmp_path / "r.txt"
+    export_report([{"region": "east", "orders": 12, "note": ""}], out)
+    for line in out.read_text().splitlines():
+        assert line == line.rstrip()