diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..f4cf343
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,21 @@
+---
+# $Id: .clang-format 567 2025-11-02 00:00:24Z nishi $
+Language: Cpp
+UseTab: Always
+TabWidth: 8
+AlignConsecutiveAssignments:
+  Enabled: true
+AlignConsecutiveDeclarations:
+  Enabled: true
+IndentWidth: 8
+PointerAlignment: Left
+ColumnLimit: 0
+AllowShortIfStatementsOnASingleLine: Always
+AllowShortBlocksOnASingleLine: Never
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortLoopsOnASingleLine: true
+SpaceBeforeParens: Never
+AlignEscapedNewlines: DontAlign
+SortIncludes: false
+AllowShortEnumsOnASingleLine: false
+#IndentPPDirectives: AfterHash
diff --git a/format.sh b/format.sh
new file mode 100755
index 0000000..cf18ab8
--- /dev/null
+++ b/format.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+cd mdebase
+./format.sh
+cd ..
+
+cd mdelibs
+./format.sh
+cd ..