diff --git a/docs/test-checklist.md b/docs/test-checklist.md
index 2be5fbe..122d18a 100644
--- a/docs/test-checklist.md
+++ b/docs/test-checklist.md
@@ -141,7 +141,7 @@ image, a cancel brought the thumbnail back, and a swipe still dismissed it.
 
 ## Polish
 
-- [ ] Region: while dragging, a `W × H` label follows the pointer (physical pixels, same as the saved PNG), flipping near the edges.
+- [ ] Region: while dragging, a square-cornered `W × H` label follows the pointer (physical pixels, same as the saved PNG), flipping near the edges.
 - [ ] Shift locks the dimension you move first; Alt grows from the centre; Space held moves the selection, and after letting go resizing continues without a jump; Space before a drag still switches to window mode.
 - [ ] `[capture] window_shadow = true`: window shots get a soft shadow following the rounded corners; preview, clipboard and file all have it.
 - [ ] Each shot is a two-hit "ka-chunk" (macOS-like) with a metallic clatter that grows from shot 2; shots in quick succession play sounds 1 → 5 getting faster and brighter, then 6, 7, 6, 7 (a climbing bell arpeggio over a glide) rising endlessly; every shot about as loud; after a 5 s pause it starts at 1 again. `valw __combo-demo` plays the whole sequence for tuning.
diff --git a/src/region.rs b/src/region.rs
index 87ee4e9..c163919 100644
--- a/src/region.rs
+++ b/src/region.rs
@@ -178,7 +178,8 @@ impl Surface {
                 ((crate::toolbar::draw::measure(&text) + 12.0) as f64 * scale).ceil() as u32,
                 ((crate::toolbar::draw::LABEL * 1.2 + 12.0) as f64 * scale).ceil() as u32,
             );
-            let pill = crate::toolbar::draw::pill(size, scale as f32, &text);
+            // Square corners: sharp, like the rest of the shell.
+            let pill = crate::toolbar::draw::pill(size, scale as f32, &text, 0.0);
             let at = render::label_origin(
                 (px * scale, py * scale),
                 (pill.width(), pill.height()),
diff --git a/src/toolbar/draw.rs b/src/toolbar/draw.rs
index 5ebd051..3d8e4b9 100644
--- a/src/toolbar/draw.rs
+++ b/src/toolbar/draw.rs
@@ -7,7 +7,7 @@ use crate::toolbar::layout::{Layout, MenuItem, Rect, Target};
 use crate::toolbar::state::ToolbarState;
 
 pub const LABEL: f32 = 13.0;
-const RADIUS: f32 = 12.0;
+pub const RADIUS: f32 = 12.0;
 const BACKGROUND: [u8; 4] = [0x1c, 0x1c, 0x1e, 230];
 const SELECTED: [u8; 4] = [255, 255, 255, 46];
 const HOVER: [u8; 4] = [255, 255, 255, 26];
@@ -130,8 +130,9 @@ pub fn bar(
     p
 }
 
-/// The countdown pill: a rounded background with `text` centred.
-pub fn pill(size: (u32, u32), scale: f32, s: &str) -> Pixmap {
+/// A pill: a background with corners of `radius` and `text` centred (the
+/// countdown is rounded, the region's size label square).
+pub fn pill(size: (u32, u32), scale: f32, s: &str, radius: f32) -> Pixmap {
     let mut p = Pixmap::new(size.0.max(1), size.1.max(1)).expect("the pill has a size");
     let r = Rect {
         x: 0.0,
@@ -139,7 +140,7 @@ pub fn pill(size: (u32, u32), scale: f32, s: &str) -> Pixmap {
         w: size.0 as f32 / scale,
         h: size.1 as f32 / scale,
     };
-    rounded(&mut p, r, RADIUS, BACKGROUND, scale);
+    rounded(&mut p, r, radius, BACKGROUND, scale);
     let left = (r.w - measure(s)) / 2.0;
     label(&mut p, r, left, s, scale);
     p
@@ -220,9 +221,16 @@ mod tests {
         assert_eq!(out, [30, 20, 10, 255]);
     }
 
+    #[test]
+    fn a_square_pill_fills_its_corners() {
+        let corner = |p: &Pixmap| p.pixel(0, 0).unwrap().alpha();
+        assert_eq!(corner(&pill((72, 40), 1.0, "5", RADIUS)), 0, "rounded");
+        assert!(corner(&pill((72, 40), 1.0, "5", 0.0)) > 200, "square");
+    }
+
     #[test]
     fn the_pill_shows_its_text() {
-        let p = pill((72, 40), 1.0, "5");
+        let p = pill((72, 40), 1.0, "5", RADIUS);
         let lit = p
             .pixels()
             .iter()
diff --git a/src/toolbar/mod.rs b/src/toolbar/mod.rs
index 93981fd..cf27d01 100644
--- a/src/toolbar/mod.rs
+++ b/src/toolbar/mod.rs
@@ -380,7 +380,7 @@ impl Pill {
             (PILL.0 as f64 * self.scale).round() as u32,
             (PILL.1 as f64 * self.scale).round() as u32,
         );
-        let pixmap = draw::pill((pw, ph), self.scale as f32, &self.text);
+        let pixmap = draw::pill((pw, ph), self.scale as f32, &self.text, draw::RADIUS);
         let Ok((buffer, canvas)) = self.pool.create_buffer(
             pw as i32,
             ph as i32,