diff --git a/quantum/action_code.h b/quantum/action_code.h
index 58d929016d6..d9a575b5183 100644
--- a/quantum/action_code.h
+++ b/quantum/action_code.h
@@ -17,6 +17,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
+#include "modifiers.h"
+
 /** \brief Action codes
  *
  * 16bit code: action_kind(4bit) + action_parameter(12bit)
@@ -160,28 +162,6 @@ typedef union {
 #define ACTION_TRANSPARENT 1
 #define ACTION(kind, param) ((kind) << 12 | (param))
 
-/** \brief Key Actions
- *
- * Mod bits:    43210
- *   bit 0      ||||+- Control
- *   bit 1      |||+-- Shift
- *   bit 2      ||+--- Alt
- *   bit 3      |+---- Gui
- *   bit 4      +----- LR flag(Left:0, Right:1)
- */
-enum mods_bit {
-    MOD_LCTL = 0x01,
-    MOD_LSFT = 0x02,
-    MOD_LALT = 0x04,
-    MOD_LGUI = 0x08,
-    MOD_RCTL = 0x11,
-    MOD_RSFT = 0x12,
-    MOD_RALT = 0x14,
-    MOD_RGUI = 0x18,
-};
-#define MOD_HYPR (MOD_LCTL | MOD_LSFT | MOD_LALT | MOD_LGUI)
-#define MOD_MEH (MOD_LCTL | MOD_LSFT | MOD_LALT)
-
 enum mods_codes {
     MODS_ONESHOT    = 0x00,
     MODS_TAP_TOGGLE = 0x01,
diff --git a/quantum/action_util.h b/quantum/action_util.h
index 6f1f09c4bd1..0ecf15ae4bf 100644
--- a/quantum/action_util.h
+++ b/quantum/action_util.h
@@ -19,6 +19,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <stdint.h>
 #include "report.h"
+#include "modifiers.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/quantum/keycode.h b/quantum/keycode.h
index 701c078ad00..df1452d2965 100644
--- a/quantum/keycode.h
+++ b/quantum/keycode.h
@@ -34,26 +34,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define IS_MOUSEKEY_WHEEL(code) (KC_MS_WH_UP <= (code) && (code) <= KC_MS_WH_RIGHT)
 #define IS_MOUSEKEY_ACCEL(code) (KC_MS_ACCEL0 <= (code) && (code) <= KC_MS_ACCEL2)
 
-#define MOD_BIT(code) (1 << MOD_INDEX(code))
-#define MOD_INDEX(code) ((code)&0x07)
-
-#define MOD_MASK_CTRL (MOD_BIT(KC_LEFT_CTRL) | MOD_BIT(KC_RIGHT_CTRL))
-#define MOD_MASK_SHIFT (MOD_BIT(KC_LEFT_SHIFT) | MOD_BIT(KC_RIGHT_SHIFT))
-#define MOD_MASK_ALT (MOD_BIT(KC_LEFT_ALT) | MOD_BIT(KC_RIGHT_ALT))
-#define MOD_MASK_GUI (MOD_BIT(KC_LEFT_GUI) | MOD_BIT(KC_RIGHT_GUI))
-#define MOD_MASK_CS (MOD_MASK_CTRL | MOD_MASK_SHIFT)
-#define MOD_MASK_CA (MOD_MASK_CTRL | MOD_MASK_ALT)
-#define MOD_MASK_CG (MOD_MASK_CTRL | MOD_MASK_GUI)
-#define MOD_MASK_SA (MOD_MASK_SHIFT | MOD_MASK_ALT)
-#define MOD_MASK_SG (MOD_MASK_SHIFT | MOD_MASK_GUI)
-#define MOD_MASK_AG (MOD_MASK_ALT | MOD_MASK_GUI)
-#define MOD_MASK_CSA (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_ALT)
-#define MOD_MASK_CSG (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_GUI)
-#define MOD_MASK_CAG (MOD_MASK_CTRL | MOD_MASK_ALT | MOD_MASK_GUI)
-#define MOD_MASK_SAG (MOD_MASK_SHIFT | MOD_MASK_ALT | MOD_MASK_GUI)
-#define MOD_MASK_CSAG (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_BIT(code) (1 << ((code)&0x07))
 
 // clang-format off
 
 // TODO: dd keycodes
 #include "keycodes.h"
+#include "modifiers.h"
diff --git a/quantum/modifiers.h b/quantum/modifiers.h
new file mode 100644
index 00000000000..45bcd6508d8
--- /dev/null
+++ b/quantum/modifiers.h
@@ -0,0 +1,54 @@
+// Copyright 2023 QMK
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+/** \brief 5-bit packed modifiers
+ *
+ * Mod bits:    43210
+ *   bit 0      ||||+- Control
+ *   bit 1      |||+-- Shift
+ *   bit 2      ||+--- Alt
+ *   bit 3      |+---- Gui
+ *   bit 4      +----- LR flag(Left:0, Right:1)
+ */
+enum mods_5bit {
+    MOD_LCTL = 0x01,
+    MOD_LSFT = 0x02,
+    MOD_LALT = 0x04,
+    MOD_LGUI = 0x08,
+    MOD_RCTL = 0x11,
+    MOD_RSFT = 0x12,
+    MOD_RALT = 0x14,
+    MOD_RGUI = 0x18,
+};
+#define MOD_HYPR (MOD_LCTL | MOD_LSFT | MOD_LALT | MOD_LGUI)
+#define MOD_MEH (MOD_LCTL | MOD_LSFT | MOD_LALT)
+
+/** \brief 8-bit packed modifiers
+ */
+enum mods_8bit {
+    MOD_BIT_LCTRL  = 0b00000001,
+    MOD_BIT_LSHIFT = 0b00000010,
+    MOD_BIT_LALT   = 0b00000100,
+    MOD_BIT_LGUI   = 0b00001000,
+    MOD_BIT_RCTRL  = 0b00010000,
+    MOD_BIT_RSHIFT = 0b00100000,
+    MOD_BIT_RALT   = 0b01000000,
+    MOD_BIT_RGUI   = 0b10000000,
+};
+#define MOD_MASK_CTRL (MOD_BIT_LCTRL | MOD_BIT_RCTRL)
+#define MOD_MASK_SHIFT (MOD_BIT_LSHIFT | MOD_BIT_RSHIFT)
+#define MOD_MASK_ALT (MOD_BIT_LALT | MOD_BIT_RALT)
+#define MOD_MASK_GUI (MOD_BIT_LGUI | MOD_BIT_RGUI)
+#define MOD_MASK_CS (MOD_MASK_CTRL | MOD_MASK_SHIFT)
+#define MOD_MASK_CA (MOD_MASK_CTRL | MOD_MASK_ALT)
+#define MOD_MASK_CG (MOD_MASK_CTRL | MOD_MASK_GUI)
+#define MOD_MASK_SA (MOD_MASK_SHIFT | MOD_MASK_ALT)
+#define MOD_MASK_SG (MOD_MASK_SHIFT | MOD_MASK_GUI)
+#define MOD_MASK_AG (MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_MASK_CSA (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_ALT)
+#define MOD_MASK_CSG (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_GUI)
+#define MOD_MASK_CAG (MOD_MASK_CTRL | MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_MASK_SAG (MOD_MASK_SHIFT | MOD_MASK_ALT | MOD_MASK_GUI)
+#define MOD_MASK_CSAG (MOD_MASK_CTRL | MOD_MASK_SHIFT | MOD_MASK_ALT | MOD_MASK_GUI)