diff --git a/crates/ui-egui/src/dialogs/form.rs b/crates/ui-egui/src/dialogs/form.rs
index ebb6c0d3..40329c8c 100644
--- a/crates/ui-egui/src/dialogs/form.rs
+++ b/crates/ui-egui/src/dialogs/form.rs
@@ -322,8 +322,19 @@ pub(super) fn schema_fields(ui: &mut egui::Ui, d: &mut Dialog, specs: &[(String,
                     crate::widgets::range_field(ui, ("plugin-num", k), x, *min..=*max, "", 2, 100.0).map(|x| json!(x))
                 }
                 ParamSpec::Int { min, max, .. } => {
-                    let x = cur.as_i64().unwrap_or(*min) as f64;
-                    crate::widgets::range_field(ui, ("plugin-int", k), x, *min as f64..=*max as f64, "", 0, 100.0).map(|x| json!(x as i64))
+                    let x = cur.as_i64().unwrap_or(*min).clamp(*min, *max);
+                    // An f64 holds every whole number up to 2^53, so the numeric field (arrows, wheel, arithmetic) is exact there.
+                    // Past it, the number typed is read as an integer.
+                    const EXACT: i64 = 1 << 53;
+                    if -EXACT <= *min && *max <= EXACT {
+                        crate::widgets::range_field(ui, ("plugin-int", k), x as f64, *min as f64..=*max as f64, "", 0, 100.0).map(|x| json!(x as i64))
+                    } else {
+                        let shown = x.to_string();
+                        crate::widgets::take_dialog_focus(ui, ui.id().with(("plugin-int", k)), &shown);
+                        crate::widgets::text_field(ui, ("plugin-int", k), Some(&shown), 100.0, 1)
+                            .and_then(|text| text.parse::<i64>().ok())
+                            .map(|x| json!(x.clamp(*min, *max)))
+                    }
                 }
                 ParamSpec::Bool { .. } => {
                     let b = cur.as_bool().unwrap_or(false);
diff --git a/crates/ui-egui/src/dialogs/tests.rs b/crates/ui-egui/src/dialogs/tests.rs
index 7885236c..5095b7c0 100644
--- a/crates/ui-egui/src/dialogs/tests.rs
+++ b/crates/ui-egui/src/dialogs/tests.rs
@@ -392,6 +392,89 @@ fn given_headings_are_shown_as_they_are() {
     assert_eq!((spec(&d.kind).heading)(&d), "Black");
 }
 
+/// A plug-in dialog with one whole-number field `seed` in `min..=max`, driven by egui events.
+struct PluginIntField {
+    ctx: egui::Context,
+    d: Dialog,
+    specs: Vec<(String, vectorcraft_plugins::ParamSpec)>,
+    pos: egui::Pos2,
+}
+
+impl PluginIntField {
+    fn new(min: i64, max: i64, start: i64) -> Self {
+        let ctx = egui::Context::default();
+        theme::install_fonts(&ctx);
+        theme::apply(&ctx, Default::default());
+        let specs = vec![("seed".into(), vectorcraft_plugins::ParamSpec::Int { min, max, default: 0 })];
+        let mut f = PluginIntField { ctx, d: Dialog::new(plugin::KIND, json!({ "seed": start })), specs, pos: egui::Pos2::ZERO };
+        fn number_rect(shape: &egui::Shape, text: &str) -> Option<egui::Rect> {
+            match shape {
+                egui::Shape::Text(t) if t.galley.text() == text => Some(t.visual_bounding_rect()),
+                egui::Shape::Vec(shapes) => shapes.iter().find_map(|s| number_rect(s, text)),
+                _ => None,
+            }
+        }
+        let out = f.run(vec![]);
+        f.pos = out.shapes.iter().find_map(|s| number_rect(&s.shape, &start.to_string())).unwrap().center();
+        f
+    }
+
+    fn run(&mut self, events: Vec<egui::Event>) -> egui::FullOutput {
+        let (d, specs) = (&mut self.d, &self.specs);
+        let mut out = self.ctx.run_ui(egui::RawInput { events, ..Default::default() }, |ui| {
+            form::schema_fields(ui, d, specs);
+        });
+        out.textures_delta.clear();
+        out
+    }
+
+    /// Clicks the field, sends `events`, presses Enter and returns the field's value.
+    fn commit(&mut self, events: Vec<egui::Event>) -> serde_json::Value {
+        use egui::{Event, Key, Modifiers, PointerButton};
+        let (pos, button) = (self.pos, PointerButton::Primary);
+        self.run(vec![Event::PointerMoved(pos), Event::PointerButton { pos, button, pressed: true, modifiers: Modifiers::default() }]);
+        self.run(vec![Event::PointerButton { pos, button, pressed: false, modifiers: Modifiers::default() }]);
+        self.run(events);
+        self.run(vec![Event::Key { key: Key::Enter, physical_key: None, pressed: true, repeat: false, modifiers: Modifiers::default() }]);
+        self.d.fields["seed"].clone()
+    }
+
+    /// Replaces the field's text with `text` and commits it.
+    fn type_text(&mut self, text: &str) -> serde_json::Value {
+        let all = egui::Modifiers { ctrl: true, command: true, ..Default::default() };
+        self.commit(vec![
+            egui::Event::Key { key: egui::Key::A, physical_key: None, pressed: true, repeat: false, modifiers: all },
+            egui::Event::Text(text.into()),
+        ])
+    }
+}
+
+#[test]
+fn plugin_integer_field_preserves_precision_and_clamps_exactly() {
+    let (min, max) = (-9007199254740995_i64, 9007199254740995_i64);
+    let mut f = PluginIntField::new(min, max, 0);
+    for (text, expected) in [
+        ("9007199254740993", 9007199254740993_i64),
+        ("9007199254740996", max),
+        ("-9007199254740996", min),
+        ("invalid", min),
+        ("1.5", min),
+        ("9223372036854775808", min),
+    ] {
+        assert_eq!(f.type_text(text), json!(expected), "{text}");
+    }
+}
+
+#[test]
+fn plugin_integer_field_with_small_bounds_keeps_numeric_editing() {
+    let mut f = PluginIntField::new(1, 16, 3);
+    let up = egui::Event::Key { key: egui::Key::ArrowUp, physical_key: None, pressed: true, repeat: false, modifiers: Default::default() };
+    assert_eq!(f.commit(vec![up]), json!(4));
+    for (text, expected) in [("7", 7), ("2 + 3", 5), ("17", 16)] {
+        assert_eq!(f.type_text(text), json!(expected), "{text}");
+    }
+}
+
 #[test]
 fn a_dialog_opens_with_its_first_field_focused_so_typing_and_enter_apply() {
     let mut app = app();