diff --git a/glfw/glfw.py b/glfw/glfw.py
index 79894ef51..1afc8c602 100755
--- a/glfw/glfw.py
+++ b/glfw/glfw.py
@@ -318,6 +318,7 @@ def generate_wrappers(glfw_header: str) -> None:
     void glfwCocoaSetWindowChrome(GLFWwindow* window, unsigned int color, bool use_system_color, unsigned int system_color,\
     int background_blur, unsigned int hide_window_decorations, bool show_text_in_titlebar, int color_space, float background_opacity, bool resizable)
     void glfwCocoaRegisterMIMETypes(GLFWwindow *window, const char **mimes, size_t count)
+    void glfwCocoaSetWindowLevel(GLFWwindow *window, const char *level_spec)
     const char* glfwGetPrimarySelectionString(GLFWwindow* window, void)
     int glfwGetNativeKeyForName(const char* key_name, int case_sensitive)
     void glfwRequestWaylandFrameEvent(GLFWwindow *handle, unsigned long long id, GLFWwaylandframecallbackfunc callback)
@@ -326,6 +327,7 @@ def generate_wrappers(glfw_header: str) -> None:
     void glfwWaylandRunWithActivationToken(GLFWwindow *handle, GLFWactivationcallback cb, void *cb_data)
     bool glfwWaylandSetTitlebarColor(GLFWwindow *handle, uint32_t color, bool use_system_color)
     void glfwWaylandSetTitlebarHidden(GLFWwindow *handle, bool hidden)
+    void glfwWaylandSetInitialWindowSizeCallback(GLFWwaylandinitialsizefun callback)
     void glfwWaylandRedrawCSDWindowTitle(GLFWwindow *handle)
     bool glfwWaylandIsWindowFullyCreated(GLFWwindow *handle)
     bool glfwWaylandBeep(GLFWwindow *handle)
diff --git a/glfw/glfw3.h b/glfw/glfw3.h
index 2e99fb2e5..bceae97ae 100644
--- a/glfw/glfw3.h
+++ b/glfw/glfw3.h
@@ -1933,6 +1933,7 @@ typedef void (* GLFWjoystickfun)(int,int);
 typedef void (* GLFWuserdatafun)(unsigned long long, void*);
 typedef void (* GLFWtickcallback)(void*);
 typedef void (* GLFWactivationcallback)(GLFWwindow *window, const char *token, void *data);
+typedef void (* GLFWwaylandinitialsizefun)(GLFWwindow *window, float xscale, float yscale, int *width, int *height);
 typedef bool (* GLFWdrawtextfun)(GLFWwindow *window, const char *text, uint32_t fg, uint32_t bg, uint8_t *output_buf, size_t width, size_t height, float x_offset, float y_offset, size_t right_margin, bool is_single_glyph);
 typedef char* (* GLFWcurrentselectionfun)(void);
 typedef bool (* GLFWhascurrentselectionfun)(void);
diff --git a/glfw/wl_window.c b/glfw/wl_window.c
index 6abb77d17..dc351eba9 100644
--- a/glfw/wl_window.c
+++ b/glfw/wl_window.c
@@ -440,8 +440,41 @@ clipboard_mime(void) {
     return buf;
 }
 
+static GLFWwaylandinitialsizefun initial_window_size_callback = NULL;
+
+GLFWAPI void
+glfwWaylandSetInitialWindowSizeCallback(GLFWwaylandinitialsizefun callback) {
+    initial_window_size_callback = callback;
+}
+
+static void
+maybe_recompute_initial_window_size(_GLFWwindow *window) {
+    // Before the initial window is mapped, the compositor tells us the real
+    // (possibly fractional) scale. For sizes specified in cells this changes
+    // the correct logical window size, because cell metrics are not a linear
+    // function of scale (integer-pixel rounding). Ask the embedder to recompute
+    // the logical size now, while the window is still unmapped, so it is mapped
+    // at the right size and the compositor's authoritative configure agrees.
+    if (window->wl.window_fully_created) return;
+    if (!initial_window_size_callback) return;
+    if (!window->wl.xdg.toplevel) return;  // only ordinary toplevels have cell-based sizes
+    if (window->wl.layer_shell.zwlr_layer_surface_v1) return;  // layer-shell surfaces size themselves
+    double scale = _glfwWaylandWindowScale(window);
+    int w = window->wl.width, h = window->wl.height;
+    initial_window_size_callback((GLFWwindow*)window, (float)scale, (float)scale, &w, &h);
+    if (w > 0 && h > 0 && (w != window->wl.width || h != window->wl.height)) {
+        debug("Recomputed initial size of window %llu for scale %.3f: %dx%d -> %dx%d\n",
+              window->id, scale, window->wl.width, window->wl.height, w, h);
+        window->wl.width = w; window->wl.height = h;
+        window->wl.user_requested_content_size.width = w;
+        window->wl.user_requested_content_size.height = h;
+        update_regions(window);
+    }
+}
+
 static void
 apply_scale_changes(_GLFWwindow *window, bool resize_framebuffer, bool update_csd) {
+    maybe_recompute_initial_window_size(window);
     double scale = _glfwWaylandWindowScale(window);
     if (resize_framebuffer) resizeFramebuffer(window);
     _glfwInputWindowContentScale(window, (float)scale, (float)scale);
diff --git a/kitty/glfw-wrapper.c b/kitty/glfw-wrapper.c
index 91d925a6d..f79dc7760 100644
--- a/kitty/glfw-wrapper.c
+++ b/kitty/glfw-wrapper.c
@@ -497,15 +497,15 @@ load_glfw(const char* path) {
     *(void **) (&glfwCocoaCycleThroughOSWindows_impl) = dlsym(handle, "glfwCocoaCycleThroughOSWindows");
     if (glfwCocoaCycleThroughOSWindows_impl == NULL) dlerror(); // clear error indicator
 
-    *(void **) (&glfwCocoaSetWindowLevel_impl) = dlsym(handle, "glfwCocoaSetWindowLevel");
-    if (glfwCocoaSetWindowLevel_impl == NULL) dlerror(); // clear error indicator
-
     *(void **) (&glfwCocoaSetWindowChrome_impl) = dlsym(handle, "glfwCocoaSetWindowChrome");
     if (glfwCocoaSetWindowChrome_impl == NULL) dlerror(); // clear error indicator
 
     *(void **) (&glfwCocoaRegisterMIMETypes_impl) = dlsym(handle, "glfwCocoaRegisterMIMETypes");
     if (glfwCocoaRegisterMIMETypes_impl == NULL) dlerror(); // clear error indicator
 
+    *(void **) (&glfwCocoaSetWindowLevel_impl) = dlsym(handle, "glfwCocoaSetWindowLevel");
+    if (glfwCocoaSetWindowLevel_impl == NULL) dlerror(); // clear error indicator
+
     *(void **) (&glfwGetPrimarySelectionString_impl) = dlsym(handle, "glfwGetPrimarySelectionString");
     if (glfwGetPrimarySelectionString_impl == NULL) dlerror(); // clear error indicator
 
@@ -530,6 +530,9 @@ load_glfw(const char* path) {
     *(void **) (&glfwWaylandSetTitlebarHidden_impl) = dlsym(handle, "glfwWaylandSetTitlebarHidden");
     if (glfwWaylandSetTitlebarHidden_impl == NULL) dlerror(); // clear error indicator
 
+    *(void **) (&glfwWaylandSetInitialWindowSizeCallback_impl) = dlsym(handle, "glfwWaylandSetInitialWindowSizeCallback");
+    if (glfwWaylandSetInitialWindowSizeCallback_impl == NULL) dlerror(); // clear error indicator
+
     *(void **) (&glfwWaylandRedrawCSDWindowTitle_impl) = dlsym(handle, "glfwWaylandRedrawCSDWindowTitle");
     if (glfwWaylandRedrawCSDWindowTitle_impl == NULL) dlerror(); // clear error indicator
 
diff --git a/kitty/glfw-wrapper.h b/kitty/glfw-wrapper.h
index ec4d42933..142ef0cfb 100644
--- a/kitty/glfw-wrapper.h
+++ b/kitty/glfw-wrapper.h
@@ -1661,6 +1661,7 @@ typedef void (* GLFWjoystickfun)(int,int);
 typedef void (* GLFWuserdatafun)(unsigned long long, void*);
 typedef void (* GLFWtickcallback)(void*);
 typedef void (* GLFWactivationcallback)(GLFWwindow *window, const char *token, void *data);
+typedef void (* GLFWwaylandinitialsizefun)(GLFWwindow *window, float xscale, float yscale, int *width, int *height);
 typedef bool (* GLFWdrawtextfun)(GLFWwindow *window, const char *text, uint32_t fg, uint32_t bg, uint8_t *output_buf, size_t width, size_t height, float x_offset, float y_offset, size_t right_margin, bool is_single_glyph);
 typedef char* (* GLFWcurrentselectionfun)(void);
 typedef bool (* GLFWhascurrentselectionfun)(void);
@@ -2479,10 +2480,6 @@ typedef void (*glfwCocoaCycleThroughOSWindows_func)(bool);
 GFW_EXTERN glfwCocoaCycleThroughOSWindows_func glfwCocoaCycleThroughOSWindows_impl;
 #define glfwCocoaCycleThroughOSWindows glfwCocoaCycleThroughOSWindows_impl
 
-typedef void (*glfwCocoaSetWindowLevel_func)(GLFWwindow*, const char*);
-GFW_EXTERN glfwCocoaSetWindowLevel_func glfwCocoaSetWindowLevel_impl;
-#define glfwCocoaSetWindowLevel glfwCocoaSetWindowLevel_impl
-
 typedef void (*glfwCocoaSetWindowChrome_func)(GLFWwindow*, unsigned int, bool, unsigned int, int, unsigned int, bool, int, float, bool);
 GFW_EXTERN glfwCocoaSetWindowChrome_func glfwCocoaSetWindowChrome_impl;
 #define glfwCocoaSetWindowChrome glfwCocoaSetWindowChrome_impl
@@ -2491,6 +2488,10 @@ typedef void (*glfwCocoaRegisterMIMETypes_func)(GLFWwindow*, const char**, size_
 GFW_EXTERN glfwCocoaRegisterMIMETypes_func glfwCocoaRegisterMIMETypes_impl;
 #define glfwCocoaRegisterMIMETypes glfwCocoaRegisterMIMETypes_impl
 
+typedef void (*glfwCocoaSetWindowLevel_func)(GLFWwindow*, const char*);
+GFW_EXTERN glfwCocoaSetWindowLevel_func glfwCocoaSetWindowLevel_impl;
+#define glfwCocoaSetWindowLevel glfwCocoaSetWindowLevel_impl
+
 typedef const char* (*glfwGetPrimarySelectionString_func)(GLFWwindow*);
 GFW_EXTERN glfwGetPrimarySelectionString_func glfwGetPrimarySelectionString_impl;
 #define glfwGetPrimarySelectionString glfwGetPrimarySelectionString_impl
@@ -2523,6 +2524,10 @@ typedef void (*glfwWaylandSetTitlebarHidden_func)(GLFWwindow*, bool);
 GFW_EXTERN glfwWaylandSetTitlebarHidden_func glfwWaylandSetTitlebarHidden_impl;
 #define glfwWaylandSetTitlebarHidden glfwWaylandSetTitlebarHidden_impl
 
+typedef void (*glfwWaylandSetInitialWindowSizeCallback_func)(GLFWwaylandinitialsizefun);
+GFW_EXTERN glfwWaylandSetInitialWindowSizeCallback_func glfwWaylandSetInitialWindowSizeCallback_impl;
+#define glfwWaylandSetInitialWindowSizeCallback glfwWaylandSetInitialWindowSizeCallback_impl
+
 typedef void (*glfwWaylandRedrawCSDWindowTitle_func)(GLFWwindow*);
 GFW_EXTERN glfwWaylandRedrawCSDWindowTitle_func glfwWaylandRedrawCSDWindowTitle_impl;
 #define glfwWaylandRedrawCSDWindowTitle glfwWaylandRedrawCSDWindowTitle_impl
diff --git a/kitty/glfw.c b/kitty/glfw.c
index 8be1474b1..fe8a8be68 100644
--- a/kitty/glfw.c
+++ b/kitty/glfw.c
@@ -1705,6 +1705,32 @@ os_window_update_size_increments(OSWindow *window) {
 }
 
 
+// Borrowed reference to the get_window_size callable, valid only for the
+// duration of a create_os_window() call. Used by the Wayland initial-size hook
+// below, which fires synchronously from inside glfwCreateWindow().
+static PyObject *initial_window_size_py_callback = NULL;
+
+static void
+wayland_initial_size_callback(GLFWwindow *window UNUSED, float xscale, float yscale, int *width, int *height) {
+    // The compositor has told us the real scale before the window is mapped;
+    // recompute the cell-based logical size for that scale so the window is
+    // mapped at the correct size in the first place.
+    if (!initial_window_size_py_callback) return;
+    double xdpi, ydpi;
+    dpi_from_scale(xscale, yscale, &xdpi, &ydpi);
+    FONTS_DATA_HANDLE fonts_data = load_fonts_data(OPT(font_size), xdpi, ydpi);
+    if (!fonts_data) return;
+    PyObject *ret = PyObject_CallFunction(initial_window_size_py_callback, "IIddff",
+            fonts_data->fcm.cell_width, fonts_data->fcm.cell_height,
+            fonts_data->logical_dpi_x, fonts_data->logical_dpi_y, xscale, yscale);
+    if (ret) {
+        int w = PyLong_AsLong(PyTuple_GET_ITEM(ret, 0)), h = PyLong_AsLong(PyTuple_GET_ITEM(ret, 1));
+        if (!PyErr_Occurred() && w > 0 && h > 0) { *width = w; *height = h; }
+        else PyErr_Clear();
+        Py_DECREF(ret);
+    } else PyErr_Clear();
+}
+
 static PyObject*
 create_os_window(PyObject UNUSED *self, PyObject *args, PyObject *kw) {
     int x = INT_MIN, y = INT_MIN, window_state = WINDOW_NORMAL, disallow_override_title = 0;
@@ -1822,7 +1848,16 @@ create_os_window(PyObject UNUSED *self, PyObject *args, PyObject *kw) {
         if (!layer_shell_config_from_python(layer_shell_config, lsc)) return NULL;
         lsc->expected.xscale = xscale; lsc->expected.yscale = yscale;
     }
+    // On Wayland the true (fractional) scale is only known after the surface
+    // exists. Register a hook so the window is mapped at the correct cell-based
+    // size once the compositor reveals the scale, rather than being resized
+    // afterwards (which loses to the compositor's authoritative configure).
+    if (global_state.is_wayland && glfwWaylandSetInitialWindowSizeCallback) {
+        glfwWaylandSetInitialWindowSizeCallback(wayland_initial_size_callback);
+        initial_window_size_py_callback = get_window_size;
+    }
     GLFWwindow *glfw_window = glfwCreateWindow(width, height, title, NULL, temp_window ? temp_window : common_context, lsc);
+    initial_window_size_py_callback = NULL;
     if (temp_window) { glfwDestroyWindow(temp_window); temp_window = NULL; }
     if (glfw_window == NULL) glfw_failure;
 #undef glfw_failure