diff --git a/src/gui/jtk/Jtk.h b/src/gui/jtk/Jtk.h
index f132677..7eccbf1 100644
--- a/src/gui/jtk/Jtk.h
+++ b/src/gui/jtk/Jtk.h
@@ -2,6 +2,7 @@
 #define JTK_H
 
 #include "Jtk_event.h"
+#include "Jtk_keys.h"
 #include "Jtk_time.h"
 #include "Jtk_timer.h"
 #include "Jtk_window.h"
diff --git a/src/gui/jtk/Jtk_event.cc b/src/gui/jtk/Jtk_event.cc
index d710543..4efff2a 100644
--- a/src/gui/jtk/Jtk_event.cc
+++ b/src/gui/jtk/Jtk_event.cc
@@ -11,6 +11,48 @@
 /** Do not wait longer than 100ms */
 #define MAX_WAIT_TIME 100000u
 
+/**
+ * Process an X keyboard event.
+ *
+ * @param x_event
+ *   Pointer to the X event.
+ * @param event
+ *   Pointer to the Jtk event.
+ */
+static bool ProcessXKeyEvent(XEvent * x_event, Jtk_Event * event)
+{
+    char buffer;
+    KeySym keysym;
+    if (XLookupString(&x_event->xkey, &buffer, 1, &keysym, nullptr) > 0)
+    {
+        uint8_t mods = 0u;
+        if (x_event->xkey.state & ShiftMask)
+        {
+            mods |= JTK_KEY_MODS_SHIFT;
+        }
+        if (x_event->xkey.state & LockMask)
+        {
+            mods |= JTK_KEY_MODS_LOCK;
+        }
+        if (x_event->xkey.state & ControlMask)
+        {
+            mods |= JTK_KEY_MODS_CTRL;
+        }
+        event->key.key = buffer;
+        event->key.mods = mods;
+    }
+    else
+    {
+        switch (keysym)
+        {
+        case XK_F1:         event->key.key = JTK_KEY_F1;        break;
+        default:
+            return false;
+        }
+    }
+    return true;
+}
+
 /**
  * Process an X event.
  *
@@ -29,10 +71,12 @@ static bool ProcessXEvent(XEvent * x_event, Jtk_Event * event)
     switch (x_event->type)
     {
     case KeyPress:
-        break;
+        event->type = JTK_EVENT_KEY_PRESS;
+        return ProcessXKeyEvent(x_event, event);
 
     case KeyRelease:
-        break;
+        event->type = JTK_EVENT_KEY_RELEASE;
+        return ProcessXKeyEvent(x_event, event);
 
     case ButtonPress:
         break;
diff --git a/src/gui/jtk/Jtk_keys.h b/src/gui/jtk/Jtk_keys.h
new file mode 100644
index 0000000..f4dc28c
--- /dev/null
+++ b/src/gui/jtk/Jtk_keys.h
@@ -0,0 +1,10 @@
+#ifndef JTK_KEYS_H
+#define JTK_KEYS_H
+
+#define JTK_KEY_MODS_SHIFT  0x1u
+#define JTK_KEY_MODS_LOCK   0x2u
+#define JTK_KEY_MODS_CTRL   0x4u
+
+#define JTK_KEY_F1          0xFF000001u
+
+#endif