diff --git a/crates/engine/src/cmd/object.rs b/crates/engine/src/cmd/object.rs
index 2d581760..e766eeea 100644
--- a/crates/engine/src/cmd/object.rs
+++ b/crates/engine/src/cmd/object.rs
@@ -297,7 +297,7 @@ pub fn specs() -> Vec<CommandSpec> {
                             st.swatch = v.into();
                         }
                         if let Some(v) = p2.get("tint").and_then(Value::as_f64) {
-                            st.tint = v as f32;
+                            st.tint = v.clamp(0.0, 1.0) as f32;
                         }
                         if let Some(v) = p2.get("weight").and_then(Value::as_f64) {
                             st.weight = v.max(0.0);
@@ -309,7 +309,7 @@ pub fn specs() -> Vec<CommandSpec> {
                             st.gap_swatch = v.into();
                         }
                         if let Some(v) = p2.get("gapTint").and_then(Value::as_f64) {
-                            st.gap_tint = v as f32;
+                            st.gap_tint = v.clamp(0.0, 1.0) as f32;
                         }
                         if let Some(v) = p2.get("gapOverprint").and_then(Value::as_bool) {
                             st.gap_overprint = v;
diff --git a/crates/engine/tests/stroke_tint_range.rs b/crates/engine/tests/stroke_tint_range.rs
new file mode 100644
index 00000000..40aca49c
--- /dev/null
+++ b/crates/engine/tests/stroke_tint_range.rs
@@ -0,0 +1,25 @@
+//! `object.stroke` keeps `tint` and `gapTint` within 0..1, so a saved document always reloads.
+use designcraft_doc::ItemId;
+use designcraft_engine::Session;
+use serde_json::json;
+
+fn stroked(tint: f64, gap_tint: f64) -> (Session, ItemId) {
+    let mut s = Session::new();
+    s.execute("file.new", &json!({})).unwrap();
+    let created = s.execute("frame.create", &json!({"rect": [36, 36, 200, 200]})).unwrap();
+    let id = ItemId(created["id"].as_u64().unwrap());
+    s.execute("object.stroke", &json!({"ids": [id.0], "swatch": "[Black]", "tint": tint, "gapTint": gap_tint})).unwrap();
+    (s, id)
+}
+
+#[test]
+fn out_of_range_stroke_tints_are_clamped_and_the_saved_file_reloads() {
+    for (tint, gap, want_tint, want_gap) in [(1e300, 1e300, 1.0, 1.0), (2.0, -1.0, 1.0, 0.0), (-1e300, 0.5, 0.0, 0.5)] {
+        let (s, id) = stroked(tint, gap);
+        let doc = &s.doc().unwrap().doc;
+        let st = &doc.item(id).unwrap().stroke;
+        assert_eq!((st.tint, st.gap_tint), (want_tint, want_gap), "tint {tint}, gapTint {gap}");
+        let bytes = designcraft_format::save(doc).unwrap();
+        designcraft_format::load(&bytes).expect("reload what we just saved");
+    }
+}