diff --git a/src/main.rs b/src/main.rs
index bb68f66..661245e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -456,7 +456,8 @@ impl Application for App {
             Message::SelectAll(entity_opt) => {
                 let entity = entity_opt.unwrap_or_else(|| self.tab_model.active());
                 if let Some(terminal) = self.tab_model.data::<Mutex<Terminal>>(entity) {
-                    log::warn!("TODO: SELECT ALL");
+                    let mut terminal = terminal.lock().unwrap();
+                    terminal.select_all();
                 }
             }
             Message::SystemThemeModeChange(_theme_mode) => {
diff --git a/src/terminal.rs b/src/terminal.rs
index 34cd98e..7687260 100644
--- a/src/terminal.rs
+++ b/src/terminal.rs
@@ -4,7 +4,8 @@ use alacritty_terminal::{
     event::{Event, EventListener, Notify, OnResize, WindowSize},
     event_loop::{EventLoop, Msg, Notifier},
     grid::Dimensions,
-    index::Point,
+    index::{Column, Line, Point, Side},
+    selection::{Selection, SelectionType},
     sync::FairMutex,
     term::{
         cell::Flags,
@@ -284,6 +285,19 @@ impl Terminal {
         }
     }
 
+    pub fn select_all(&mut self) {
+        {
+            let mut term = self.term.lock();
+            let grid = term.grid();
+            let start = Point::new(Line(-(grid.history_size() as i32)), Column(0));
+            let end = Point::new(Line(grid.screen_lines() as i32), Column(grid.columns()));
+            let mut selection = Selection::new(SelectionType::Lines, start, Side::Left);
+            selection.update(end, Side::Right);
+            term.selection = Some(selection);
+        }
+        self.update();
+    }
+
     pub fn set_config(&mut self, config: &crate::Config, themes: &HashMap<String, Colors>) {
         let mut update_cell_size = false;
         let mut update = false;