diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..351ffdb
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+# Never apply line-ending conversion to binary files. A PDF with no NUL bytes
+# is otherwise auto-detected as text and corrupted by core.autocrlf.
+*.pdf binary
+*.png binary
+*.prg binary
+*.bin binary
+*.d64 binary
+*.d71 binary
+*.d81 binary