diff --git a/src/renderer/win32/renderer.zig b/src/renderer/win32/renderer.zig
index 65337b1..fe8f24a 100644
--- a/src/renderer/win32/renderer.zig
+++ b/src/renderer/win32/renderer.zig
@@ -376,6 +376,16 @@ pub fn adjust_fontsize(self: *Self, amount: f32) void {
     gui.adjust_fontsize(hwnd, amount);
 }
 
+pub fn set_fontsize(self: *Self, fontsize: f32) void {
+    const hwnd = self.hwnd orelse return;
+    gui.set_fontsize(hwnd, fontsize);
+}
+
+pub fn set_fontface(self: *Self, fontface: []const u8) void {
+    const hwnd = self.hwnd orelse return;
+    gui.set_fontface(hwnd, fontface);
+}
+
 pub fn set_terminal_cursor_color(self: *Self, color: Color) void {
     _ = self;
     _ = color;
diff --git a/src/tui/mainview.zig b/src/tui/mainview.zig
index e225177..52ac37c 100644
--- a/src/tui/mainview.zig
+++ b/src/tui/mainview.zig
@@ -643,6 +643,24 @@ const cmds = struct {
             tui.current().rdr.adjust_fontsize(amount);
     }
     pub const adjust_fontsize_meta = .{ .arguments = &.{.float} };
+
+    pub fn set_fontsize(_: *Self, ctx: Ctx) Result {
+        var fontsize: f32 = undefined;
+        if (!try ctx.args.match(.{tp.extract(&fontsize)}))
+            return error.InvalidArgument;
+        if (build_options.gui)
+            tui.current().rdr.set_fontsize(fontsize);
+    }
+    pub const set_fontsize_meta = .{ .arguments = &.{.float} };
+
+    pub fn set_fontface(_: *Self, ctx: Ctx) Result {
+        var fontface: []const u8 = undefined;
+        if (!try ctx.args.match(.{tp.extract(&fontface)}))
+            return error.InvalidArgument;
+        if (build_options.gui)
+            tui.current().rdr.set_fontface(fontface);
+    }
+    pub const set_fontface_meta = .{ .arguments = &.{.float} };
 };
 
 pub fn handle_editor_event(self: *Self, _: tp.pid_ref, m: tp.message) tp.result {
diff --git a/src/win32/gui.zig b/src/win32/gui.zig
index 757286a..f815d42 100644
--- a/src/win32/gui.zig
+++ b/src/win32/gui.zig
@@ -22,10 +22,14 @@ const HResultError = ddui.HResultError;
 const WM_APP_EXIT = win32.WM_APP + 1;
 const WM_APP_SET_BACKGROUND = win32.WM_APP + 2;
 const WM_APP_ADJUST_FONTSIZE = win32.WM_APP + 3;
+const WM_APP_SET_FONTSIZE = win32.WM_APP + 4;
+const WM_APP_SET_FONTFACE = win32.WM_APP + 5;
 
 const WM_APP_EXIT_RESULT = 0x45feaa11;
 const WM_APP_SET_BACKGROUND_RESULT = 0x369a26cd;
 const WM_APP_ADJUST_FONTSIZE_RESULT = 0x79aba9ef;
+const WM_APP_SET_FONTSIZE_RESULT = 0x72fa44bc;
+const WM_APP_SET_FONTFACE_RESULT = 0x1a49ffa8;
 
 pub const DropWriter = struct {
     pub const WriteError = error{};
@@ -176,7 +180,7 @@ fn getFontFace() [:0]const u16 {
     if (global.fontface == null) {
         const conf = getConfig();
         global.fontface = blk: {
-            break :blk std.unicode.utf8ToUtf16LeAllocZ(global.arena, conf.fontface) catch |e| {
+            break :blk std.unicode.utf8ToUtf16LeAllocZ(std.heap.c_allocator, conf.fontface) catch |e| {
                 std.log.err("failed to convert fontface name with {s}", .{@errorName(e)});
                 const default = comptime getFieldDefault(
                     std.meta.fieldInfo(gui_config, .fontface),
@@ -582,6 +586,28 @@ pub fn adjust_fontsize(hwnd: win32.HWND, amount: f32) void {
     ));
 }
 
+pub fn set_fontsize(hwnd: win32.HWND, fontsize: f32) void {
+    std.debug.assert(WM_APP_SET_FONTSIZE_RESULT == win32.SendMessageW(
+        hwnd,
+        WM_APP_SET_FONTSIZE,
+        @as(u32, @bitCast(fontsize)),
+        0,
+    ));
+}
+
+pub fn set_fontface(hwnd: win32.HWND, fontface_utf8: []const u8) void {
+    const fontface = std.unicode.utf8ToUtf16LeAllocZ(std.heap.c_allocator, fontface_utf8) catch |e| {
+        std.log.err("failed to convert fontface name '{s}' with {s}", .{ fontface_utf8, @errorName(e) });
+        return;
+    };
+    std.debug.assert(WM_APP_SET_FONTFACE_RESULT == win32.SendMessageW(
+        hwnd,
+        WM_APP_SET_FONTFACE,
+        @intFromPtr(fontface.ptr),
+        @intCast(fontface.len),
+    ));
+}
+
 pub fn updateScreen(screen: *const vaxis.Screen) void {
     global.shared_screen.mutex.lock();
     defer global.shared_screen.mutex.unlock();
@@ -1272,6 +1298,23 @@ fn WndProc(
             win32.invalidateHwnd(hwnd);
             return WM_APP_ADJUST_FONTSIZE_RESULT;
         },
+        WM_APP_SET_FONTSIZE => {
+            const fontsize: f32 = @bitCast(@as(u32, @intCast(0xFFFFFFFFF & wparam)));
+            global.fontsize = @max(fontsize, 1.0);
+            updateWindowSize(hwnd, win32.WMSZ_BOTTOMRIGHT);
+            win32.invalidateHwnd(hwnd);
+            return WM_APP_SET_FONTSIZE_RESULT;
+        },
+        WM_APP_SET_FONTFACE => {
+            var fontface: [:0]const u16 = undefined;
+            fontface.ptr = @ptrFromInt(wparam);
+            fontface.len = @intCast(lparam);
+            if (global.fontface) |old_fontface| std.heap.c_allocator.free(old_fontface);
+            global.fontface = fontface;
+            updateWindowSize(hwnd, win32.WMSZ_BOTTOMRIGHT);
+            win32.invalidateHwnd(hwnd);
+            return WM_APP_SET_FONTFACE_RESULT;
+        },
         win32.WM_CREATE => {
             std.debug.assert(global.state == null);
             const create_struct: *win32.CREATESTRUCTW = @ptrFromInt(@as(usize, @bitCast(lparam)));