diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..1774c0113
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,5 @@
+# Keep text checkouts consistent with the repository formatter on every platform.
+* text=auto eol=lf
+
+# Windows command fixtures retain their native line endings.
+*.cmd text eol=crlf