diff --git a/crates/engine/src/cmd/layout.rs b/crates/engine/src/cmd/layout.rs
index 3ddaaf4c6..5e1879573 100644
--- a/crates/engine/src/cmd/layout.rs
+++ b/crates/engine/src/cmd/layout.rs
@@ -118,11 +118,21 @@ pub fn specs() -> Vec<CommandSpec> {
                 let count = p.get("count").and_then(Value::as_u64).unwrap_or(1).clamp(1, 9999) as usize;
                 let st = s.doc()?;
                 let n = st.doc.page_count();
-                let index = |k: &str| p.get(k).and_then(Value::as_u64).map(|v| usize::try_from(v).unwrap_or(usize::MAX));
+                // A placement given (null included) must be a page index; only when neither is
+                // given do the pages go after the last.
+                if p.get("after").is_some() && p.get("before").is_some() {
+                    return Err(bad("layout.pages.insert", "give `after` or `before`, not both"));
+                }
+                let index = |k: &str| match p.get(k) {
+                    None => Ok(None),
+                    Some(v) => v
+                        .as_u64()
+                        .map(|v| Some(usize::try_from(v).unwrap_or(usize::MAX)))
+                        .ok_or_else(|| bad("layout.pages.insert", format!("`{k}` must be a page index, not {v}"))),
+                };
                 // The page the new ones follow; none: they go first.
-                let after = match (index("after"), index("before")) {
-                    (Some(_), Some(_)) => return Err(bad("layout.pages.insert", "give `after` or `before`, not both")),
-                    (None, Some(b)) => b.checked_sub(1),
+                let after = match (index("after")?, index("before")?) {
+                    (_, Some(b)) => b.checked_sub(1),
                     (a, None) => Some(a.unwrap_or(n.saturating_sub(1))),
                 };
                 let parent = parent_ref("layout.pages.insert", &st.doc, p.get("parent"))?.unwrap_or_else(|| st.doc.parents.first().map(|x| x.id));
@@ -1884,10 +1894,22 @@ mod parent_margin_tests {
         assert_eq!(then[..3], now[..3]);
         assert_eq!(then[5], old[2]);
         assert_eq!((parent(&s, 3), parent(&s, 4)), (None, None));
+        // Refused without a change or an undo step: both placements, even one of them null, and a
+        // placement that isn't a page index.
         let undo = s.doc().unwrap().history.undo.len();
-        assert!(s.execute("layout.pages.insert", &json!({"after": 0, "before": 1})).is_err());
-        assert_eq!(s.doc().unwrap().history.undo.len(), undo);
-        assert_eq!(ids(&s), then);
+        for bad in [
+            json!({"after": 0, "before": 1}),
+            json!({"after": 0, "before": null}),
+            json!({"after": null, "before": 1}),
+            json!({"before": -1}),
+            json!({"before": "0"}),
+            json!({"before": null}),
+            json!({"after": 1.5}),
+        ] {
+            assert!(s.execute("layout.pages.insert", &bad).is_err(), "{bad}");
+            assert_eq!(s.doc().unwrap().history.undo.len(), undo, "{bad}");
+            assert_eq!(ids(&s), then, "{bad}");
+        }
     }
 
     #[test]
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 13ce41a6e..640888f24 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -3132,7 +3132,8 @@ pub fn confirm(app: &mut DesignApp) -> Result<Value, String> {
         "ruby" => app.run("type.ruby", style_cjk::ruby_params(&d)),
         "insertPages" => {
             let n = app.session.active().map_or(1, |st| st.doc.page_count());
-            let page = d.n("page").unwrap_or(0.0).max(0.0) as usize;
+            // The page the menu shows: a page past the end is the last.
+            let page = (d.n("page").unwrap_or(0.0).max(0.0) as usize).min(n.saturating_sub(1));
             let mut p = json!({"count": d.n("count").unwrap_or(1.0).clamp(1.0, 9999.0) as u64});
             match d.s("insert").as_str() {
                 "before" => p["before"] = json!(page),
@@ -7485,6 +7486,24 @@ mod tests {
         assert!(matches!(fill(&app, id), designcraft_color::Color::Rgb { .. }), "{:?}", fill(&app, id));
     }
 
+    /// A page past the end shows as the last page in the dialog, and Before Page puts the new
+    /// page before that one rather than at the end.
+    #[test]
+    fn insert_pages_before_a_page_past_the_end_goes_before_the_last() {
+        let mut app = DesignApp::new(designcraft_engine::Session::new(), crate::Services::default());
+        app.run("file.new", json!({"pages": 4, "facingPages": false})).unwrap();
+        let ids = |app: &DesignApp| {
+            let d = &app.session.doc().unwrap().doc;
+            (0..d.page_count()).map(|i| d.page(i).unwrap().id).collect::<Vec<_>>()
+        };
+        let old = ids(&app);
+        app.ui.dialog = Some(Dialog::new("insertPages", json!({"count": 1, "insert": "before", "page": 100, "parent": ""})));
+        confirm(&mut app).unwrap();
+        let now = ids(&app);
+        assert_eq!(now.len(), 5);
+        assert_eq!((now[..3].to_vec(), now[4]), (old[..3].to_vec(), old[3]), "the new page is fourth, before the old last page");
+    }
+
     /// The course's chapter 25: Insert Pages as InDesign's. It opens after the page in view with
     /// that page's parent; At Start of Document with B-Cover puts a B page first, and Before Page
     /// with [None] puts a page without a parent before the page chosen.
diff --git a/crates/ui-egui/src/i18n.rs b/crates/ui-egui/src/i18n.rs
index ddc27e2eb..ee60b7d27 100644
--- a/crates/ui-egui/src/i18n.rs
+++ b/crates/ui-egui/src/i18n.rs
@@ -1846,6 +1846,7 @@ const TABLE: &[(&str, [&str; 5])] = &[
         ["Insert Math Expression…", "Insérer une expression mathématique…", "Insert Math Expression…", "Insert Math Expression…", "插入数学公式…"],
     ),
     ("Insert Pages…", ["Insert Pages…", "Insérer des pages…", "Insert Pages…", "Insert Pages…", "插入页面…"]),
+    ("Insert Pages", ["Seiten einfügen", "Insérer des pages", "Insertar páginas", "ページを挿入", "插入页面"]),
     ("Insert:", ["Einfügen:", "Insérer :", "Insertar:", "挿入:", "插入："]),
     ("Parent:", ["Vorlagenseite:", "Gabarit :", "Página principal:", "親ページ:", "主页："]),
     ("After Page", ["Nach Seite", "Après la page", "Después de la página", "ページの後", "页面后"]),
diff --git a/crates/ui-egui/src/i18n/fr.rs b/crates/ui-egui/src/i18n/fr.rs
index 78c5d5948..46558bb58 100644
--- a/crates/ui-egui/src/i18n/fr.rs
+++ b/crates/ui-egui/src/i18n/fr.rs
@@ -84,7 +84,6 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Insert Anchored Object", "Insérer un objet ancré"),
     ("Insert Cross-Reference", "Insérer une référence croisée"),
     ("Insert Math Expression", "Insérer une expression mathématique"),
-    ("Insert Pages", "Insérer des pages"),
     ("Internet Standard RGB (sRGB)", "RVB standard Internet (sRGB)"),
     ("Join the ArtCraft Discord", "Rejoindre le Discord d'ArtCraft"),
     ("Join the community", "Rejoindre la communauté"),
diff --git a/crates/ui-egui/src/i18n/ka.rs b/crates/ui-egui/src/i18n/ka.rs
index fb802b878..35561798a 100644
--- a/crates/ui-egui/src/i18n/ka.rs
+++ b/crates/ui-egui/src/i18n/ka.rs
@@ -33,7 +33,7 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Paste", "ჩასმა"),
     ("At End of Document", "დოკუმენტის ბოლოს"),
     ("At Start of Document", "დოკუმენტის დასაწყისში"),
-    ("Before Page", "გვერდამდე"),
+    ("Before Page", "გვერდის წინ"),
     ("After Page", "გვერდის შემდეგ"),
     ("Parent:", "საბაზო გვერდი:"),
     ("Insert:", "ჩასმა:"),