diff --git a/kittens/unicode_input/main.py b/kittens/unicode_input/main.py
index 5746a5e55..22e5b341c 100644
--- a/kittens/unicode_input/main.py
+++ b/kittens/unicode_input/main.py
@@ -391,6 +391,22 @@ class UnicodeInput(Handler):
         self.refresh()
 
     def on_key(self, key_event):
+        if self.mode is HEX and key_event.type is not RELEASE and not key_event.mods:
+            if key_event.key is TAB:
+                val = int(self.line_edit.current_input, 16)
+                self.line_edit.current_input = hex(val+0x10)[2:]
+                self.refresh()
+                return
+            if key_event.key is UP:
+                val = int(self.line_edit.current_input, 16)
+                self.line_edit.current_input = hex(val+1)[2:]
+                self.refresh()
+                return
+            if key_event.key is DOWN:
+                val = int(self.line_edit.current_input, 16)
+                self.line_edit.current_input = hex(val-1)[2:]
+                self.refresh()
+                return
         if self.mode is NAME and key_event.type is not RELEASE and not key_event.mods:
             if key_event.key is TAB:
                 if key_event.mods == SHIFT: