diff --git a/build.zig b/build.zig
index 6dc1562..70c71d0 100644
--- a/build.zig
+++ b/build.zig
@@ -88,6 +88,11 @@ pub fn build(b: *std.Build) void {
         .root_source_file = .{ .path = "src/tracy_noop.zig" },
     });
 
+    const zg_dep = b.dependency("zg", .{
+        .target = target,
+        .optimize = dependency_optimize,
+    });
+
     const themes_dep = b.dependency("themes", .{});
 
     const syntax_dep = b.dependency("syntax", .{
@@ -224,6 +229,7 @@ pub fn build(b: *std.Build) void {
             .{ .name = "color", .module = color_mod },
             .{ .name = "diff", .module = diff_mod },
             .{ .name = "help.md", .module = help_mod },
+            .{ .name = "CaseData", .module = zg_dep.module("CaseData") },
         },
     });
 
diff --git a/build.zig.zon b/build.zig.zon
index 3beb752..61f70ef 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -39,6 +39,10 @@
             .url = "git+https://github.com/rockorager/libvaxis#cce22e885013f91b6a226567f20afc3475ca46e0",
             .hash = "1220f1be979b6df72ff6bc6ed3d6fb0b74d99b75d1f8a86b392c2038702533461696",
         },
+        .zg = .{
+            .url = "git+https://codeberg.org/dude_the_builder/zg#16735685fcc3410de361ba3411788ad1fb4fe188",
+            .hash = "1220fe9ac5cdb41833d327a78745614e67d472469f8666567bd8cf9f5847a52b1c51",
+        },
     },
     .paths = .{
         "include",
diff --git a/src/tui/editor.zig b/src/tui/editor.zig
index 7a7d94b..59f8078 100644
--- a/src/tui/editor.zig
+++ b/src/tui/editor.zig
@@ -9,6 +9,7 @@ const tracy = @import("tracy");
 const text_manip = @import("text_manip");
 const syntax = @import("syntax");
 const project_manager = @import("project_manager");
+const CaseData = @import("CaseData");
 
 const Plane = @import("renderer").Plane;
 const Cell = @import("renderer").Cell;
@@ -3533,6 +3534,64 @@ pub const Editor = struct {
         if (state.whole_file) |*buf| buf.deinit();
         self.filter = null;
     }
+
+    fn to_upper_cursel(self: *Self, root_: Buffer.Root, cursel: *CurSel, a: Allocator) error{Stop}!Buffer.Root {
+        var root = root_;
+        const saved = cursel.*;
+        const sel = if (cursel.selection) |*sel| sel else ret: {
+            var sel = cursel.enable_selection();
+            move_cursor_word_begin(root, &sel.begin, self.plane) catch return error.Stop;
+            move_cursor_word_end(root, &sel.end, self.plane) catch return error.Stop;
+            break :ret sel;
+        };
+        var sfa = std.heap.stackFallback(4096, self.a);
+        const cut_text = copy_selection(root, sel.*, sfa.get(), self.plane) catch return error.Stop;
+        defer a.free(cut_text);
+        const cd = CaseData.init(a) catch return error.Stop;
+        defer cd.deinit();
+        const ucased = cd.toUpperStr(a, cut_text) catch return error.Stop;
+        defer a.free(ucased);
+        root = try self.delete_selection(root, cursel, a);
+        root = self.insert(root, cursel, ucased, a) catch return error.Stop;
+        cursel.* = saved;
+        return root;
+    }
+
+    pub fn to_upper(self: *Self, _: command.Context) tp.result {
+        const b = self.buf_for_update() catch |e| return tp.exit_error(e);
+        const root = self.with_cursels_mut(b.root, to_upper_cursel, b.a) catch |e| return tp.exit_error(e);
+        self.update_buf(root) catch |e| return tp.exit_error(e);
+        self.clamp();
+    }
+
+    fn to_lower_cursel(self: *Self, root_: Buffer.Root, cursel: *CurSel, a: Allocator) error{Stop}!Buffer.Root {
+        var root = root_;
+        const saved = cursel.*;
+        const sel = if (cursel.selection) |*sel| sel else ret: {
+            var sel = cursel.enable_selection();
+            move_cursor_word_begin(root, &sel.begin, self.plane) catch return error.Stop;
+            move_cursor_word_end(root, &sel.end, self.plane) catch return error.Stop;
+            break :ret sel;
+        };
+        var sfa = std.heap.stackFallback(4096, self.a);
+        const cut_text = copy_selection(root, sel.*, sfa.get(), self.plane) catch return error.Stop;
+        defer a.free(cut_text);
+        const cd = CaseData.init(a) catch return error.Stop;
+        defer cd.deinit();
+        const ucased = cd.toLowerStr(a, cut_text) catch return error.Stop;
+        defer a.free(ucased);
+        root = try self.delete_selection(root, cursel, a);
+        root = self.insert(root, cursel, ucased, a) catch return error.Stop;
+        cursel.* = saved;
+        return root;
+    }
+
+    pub fn to_lower(self: *Self, _: command.Context) tp.result {
+        const b = self.buf_for_update() catch |e| return tp.exit_error(e);
+        const root = self.with_cursels_mut(b.root, to_lower_cursel, b.a) catch |e| return tp.exit_error(e);
+        self.update_buf(root) catch |e| return tp.exit_error(e);
+        self.clamp();
+    }
 };
 
 pub fn create(a: Allocator, parent: Widget) !Widget {
diff --git a/src/tui/mode/input/flow.zig b/src/tui/mode/input/flow.zig
index 44052a2..163df1f 100644
--- a/src/tui/mode/input/flow.zig
+++ b/src/tui/mode/input/flow.zig
@@ -140,7 +140,8 @@ fn mapPress(self: *Self, keypress: u32, egc: u32, modifiers: u32) tp.result {
             'J' => self.cmd("join_next_line", .{}),
             'N' => self.cmd("goto_next_diagnostic", .{}),
             'P' => self.cmd("goto_prev_diagnostic", .{}),
-            'L' => self.cmd("toggle_logview", .{}),
+            'U' => self.cmd("to_upper", .{}),
+            'L' => self.cmd("to_lower", .{}),
             'I' => self.cmd("toggle_inputview", .{}),
             'B' => self.cmd("move_word_left", .{}),
             'F' => self.cmd("move_word_right", .{}),
diff --git a/src/tui/mode/input/vim/insert.zig b/src/tui/mode/input/vim/insert.zig
index 47a00e9..cfd3ae1 100644
--- a/src/tui/mode/input/vim/insert.zig
+++ b/src/tui/mode/input/vim/insert.zig
@@ -143,7 +143,8 @@ fn mapPress(self: *Self, keypress: u32, egc: u32, modifiers: u32) tp.result {
             'J' => self.cmd("join_next_line", .{}),
             'N' => self.cmd("goto_next_match", .{}),
             'P' => self.cmd("goto_prev_match", .{}),
-            'L' => self.cmd("toggle_logview", .{}),
+            'U' => self.cmd("to_upper", .{}),
+            'L' => self.cmd("to_lower", .{}),
             'I' => self.cmd("toggle_inputview", .{}),
             'B' => self.cmd("move_word_left", .{}),
             'F' => self.cmd("move_word_right", .{}),
diff --git a/src/tui/mode/input/vim/normal.zig b/src/tui/mode/input/vim/normal.zig
index e7487e1..aa91ecc 100644
--- a/src/tui/mode/input/vim/normal.zig
+++ b/src/tui/mode/input/vim/normal.zig
@@ -146,7 +146,8 @@ fn mapPress(self: *Self, keypress: u32, egc: u32, modifiers: u32) tp.result {
             'J' => self.cmd("join_next_line", .{}),
             'N' => self.cmd("goto_next_match", .{}),
             'P' => self.cmd("goto_prev_match", .{}),
-            'L' => self.cmd("toggle_logview", .{}),
+            'U' => self.cmd("to_upper", .{}),
+            'L' => self.cmd("to_lower", .{}),
             'I' => self.cmd("toggle_inputview", .{}),
             'B' => self.cmd("move_word_left", .{}),
             'F' => self.cmd("move_word_right", .{}),
diff --git a/src/tui/mode/input/vim/visual.zig b/src/tui/mode/input/vim/visual.zig
index 7cb81ba..f2d7eb2 100644
--- a/src/tui/mode/input/vim/visual.zig
+++ b/src/tui/mode/input/vim/visual.zig
@@ -146,7 +146,8 @@ fn mapPress(self: *Self, keypress: u32, egc: u32, modifiers: u32) tp.result {
             'J' => self.cmd("join_next_line", .{}),
             'N' => self.cmd("goto_next_match", .{}),
             'P' => self.cmd("goto_prev_match", .{}),
-            'L' => self.cmd("toggle_logview", .{}),
+            'U' => self.cmd("to_upper", .{}),
+            'L' => self.cmd("to_lower", .{}),
             'I' => self.cmd("toggle_inputview", .{}),
             'B' => self.cmd("select_word_left", .{}),
             'F' => self.cmd("select_word_right", .{}),