diff --git a/docs/specs/helpers.md b/docs/specs/helpers.md
index 2ec6092..53974f7 100644
--- a/docs/specs/helpers.md
+++ b/docs/specs/helpers.md
@@ -57,6 +57,47 @@ The anchor point is highlighted with an orange dot.
 
 {schema_object:helpers/marker}
 
+<h2 id="slots">Slots</h2>
+
+Slots are a way to define a property value once and use the value in multiple
+properties. Slot definitions are in a dictionary, the slot definition key is the
+key that is used to match all properties with an `sid` field to the same key for
+replacement.
+
+<h3 id="slot">Slot</h3>
+
+{schema_string:helpers/slot/description}
+
+{schema_object:helpers/slot}
+
+<h3 id="slottable-object">Slotabble Object</h3>
+
+{schema_string:helpers/slottable-object/description}
+
+{schema_object:helpers/slottable-object}
+
+<h3 id="slottable-property">Slotabble Property</h3>
+
+{schema_string:helpers/slottable-property/description}
+
+{schema_object:helpers/slottable-property}
+
+<lottie-playground example="slots.json">
+    <form>
+        <input title="Scale X" type="range" min="0" value="100" max="200"/>
+        <input title="Scale Y" type="range" min="0" value="100" max="200"/>
+        <input title="Rotation" type="range" min="-360" value="0" max="360"/>
+        <input title="Opacity" type="range" min="0" value="100" max="100"/>
+    </form>
+    <json>lottie.slots</json>
+    <script>
+    lottie.slots.rotation.p.k = data["Rotation"];
+    lottie.slots.opacity.p.k = data["Opacity"];
+    lottie.slots.scale.p.k[0] = data["Scale X"];
+    lottie.slots.scale.p.k[1] = data["Scale Y"];
+    </script>
+</lottie-playground>
+
 <h2 id="mask">Mask</h2>
 
 {schema_string:helpers/mask/description}
diff --git a/docs/static/examples/slots.json b/docs/static/examples/slots.json
new file mode 100644
index 0000000..006ae9a
--- /dev/null
+++ b/docs/static/examples/slots.json
@@ -0,0 +1,260 @@
+{
+  "v": "5.12.2",
+  "fr": 29.9700012207031,
+  "ip": 0,
+  "op": 900.000036657751,
+  "w": 512,
+  "h": 512,
+  "nm": "SlotDemo",
+  "ddd": 0,
+  "assets": [],
+  "layers": [
+    {
+      "ddd": 0,
+      "ind": 1,
+      "ty": 4,
+      "nm": "Shape Layer 1",
+      "sr": 1,
+      "ks": {
+        "o": { "a": 0, "k": 100, "ix": 11 },
+        "r": { "a": 0, "k": 0, "ix": 10 },
+        "p": { "a": 0, "k": [256, 256, 0], "ix": 2, "l": 2 },
+        "a": { "a": 0, "k": [0, 0, 0], "ix": 1, "l": 2 },
+        "s": { "a": 0, "k": [100, 100, 100], "ix": 6, "l": 2 }
+      },
+      "ao": 0,
+      "shapes": [
+        {
+          "ty": "gr",
+          "it": [
+            {
+              "ty": "sr",
+              "sy": 2,
+              "d": 1,
+              "pt": { "a": 0, "k": 3, "ix": 3 },
+              "p": { "a": 0, "k": [0, 0], "ix": 4 },
+              "r": { "a": 0, "k": 0, "ix": 5 },
+              "or": { "a": 0, "k": 100, "ix": 7 },
+              "os": { "a": 0, "k": 0, "ix": 9 },
+              "ix": 1,
+              "nm": "Polystar Path 1",
+              "mn": "ADBE Vector Shape - Star",
+              "hd": false
+            },
+            {
+              "ty": "st",
+              "c": {
+                "a": 0,
+                "k": [0.271324008119, 0.323676015816, 0.880510995902, 1],
+                "ix": 3
+              },
+              "o": { "a": 0, "k": 100, "ix": 4 },
+              "w": { "a": 0, "k": 6, "ix": 5 },
+              "lc": 1,
+              "lj": 1,
+              "ml": 4,
+              "bm": 0,
+              "nm": "Stroke 1",
+              "mn": "ADBE Vector Graphic - Stroke",
+              "hd": false
+            },
+            {
+              "ty": "tr",
+              "p": { "a": 0, "k": [-128, 128], "ix": 2 },
+              "a": { "a": 0, "k": [0, 0], "ix": 1 },
+              "s": { "a": 0, "k": [100, 100], "ix": 3, "sid": "scale" },
+              "r": { "a": 0, "k": 0, "ix": 6, "sid": "rotation" },
+              "o": { "a": 0, "k": 100, "ix": 7, "sid": "opacity"},
+              "sk": { "a": 0, "k": 0, "ix": 4 },
+              "sa": { "a": 0, "k": 0, "ix": 5 },
+              "nm": "Transform"
+            }
+          ],
+          "nm": "Polystar 2",
+          "np": 3,
+          "cix": 2,
+          "bm": 0,
+          "ix": 1,
+          "mn": "ADBE Vector Group",
+          "hd": false
+        },
+        {
+          "ty": "gr",
+          "it": [
+            {
+              "d": 1,
+              "ty": "el",
+              "s": { "a": 0, "k": [149.971, 150], "ix": 2 },
+              "p": { "a": 0, "k": [0, 0], "ix": 3 },
+              "nm": "Ellipse Path 1",
+              "mn": "ADBE Vector Shape - Ellipse",
+              "hd": false
+            },
+            {
+              "ty": "st",
+              "c": {
+                "a": 0,
+                "k": [0.271324008119, 0.323676015816, 0.880510995902, 1],
+                "ix": 3
+              },
+              "o": { "a": 0, "k": 100, "ix": 4 },
+              "w": { "a": 0, "k": 6, "ix": 5 },
+              "lc": 1,
+              "lj": 1,
+              "ml": 4,
+              "bm": 0,
+              "nm": "Stroke 1",
+              "mn": "ADBE Vector Graphic - Stroke",
+              "hd": false
+            },
+            {
+              "ty": "tr",
+              "p": { "a": 0, "k": [128, -128], "ix": 2 },
+              "a": { "a": 0, "k": [0, 0], "ix": 1 },
+              "s": { "a": 0, "k": [100, 100], "ix": 3, "sid": "scale" },
+              "r": { "a": 0, "k": 0, "ix": 6, "sid": "rotation" },
+              "o": { "a": 0, "k": 100, "ix": 7, "sid": "opacity"},
+              "sk": { "a": 0, "k": 0, "ix": 4 },
+              "sa": { "a": 0, "k": 0, "ix": 5 },
+              "nm": "Transform"
+            }
+          ],
+          "nm": "Ellipse 1",
+          "np": 3,
+          "cix": 2,
+          "bm": 0,
+          "ix": 2,
+          "mn": "ADBE Vector Group",
+          "hd": false
+        },
+        {
+          "ty": "gr",
+          "it": [
+            {
+              "ty": "sr",
+              "sy": 1,
+              "d": 1,
+              "pt": { "a": 0, "k": 5, "ix": 3 },
+              "p": { "a": 0, "k": [0, 0], "ix": 4 },
+              "r": { "a": 0, "k": 0, "ix": 5 },
+              "ir": { "a": 0, "k": 50, "ix": 6 },
+              "is": { "a": 0, "k": 0, "ix": 8 },
+              "or": { "a": 0, "k": 100, "ix": 7 },
+              "os": { "a": 0, "k": 0, "ix": 9 },
+              "ix": 1,
+              "nm": "Polystar Path 1",
+              "mn": "ADBE Vector Shape - Star",
+              "hd": false
+            },
+            {
+              "ty": "fl",
+              "c": {
+                "a": 0,
+                "k": [0.271324008119, 0.323676015816, 0.880510995902, 1],
+                "ix": 4
+              },
+              "o": { "a": 0, "k": 100, "ix": 5 },
+              "r": 1,
+              "bm": 0,
+              "nm": "Fill 1",
+              "mn": "ADBE Vector Graphic - Fill",
+              "hd": false
+            },
+            {
+              "ty": "tr",
+              "p": { "a": 0, "k": [128, 128], "ix": 2 },
+              "a": { "a": 0, "k": [0, 0], "ix": 1 },
+              "s": { "a": 0, "k": [100, 100], "ix": 3, "sid": "scale" },
+              "r": { "a": 0, "k": 0, "ix": 6, "sid": "rotation" },
+              "o": { "a": 0, "k": 100, "ix": 7, "sid": "opacity"},
+              "sk": { "a": 0, "k": 0, "ix": 4 },
+              "sa": { "a": 0, "k": 0, "ix": 5 },
+              "nm": "Transform"
+            }
+          ],
+          "nm": "Polystar 1",
+          "np": 3,
+          "cix": 2,
+          "bm": 0,
+          "ix": 3,
+          "mn": "ADBE Vector Group",
+          "hd": false
+        },
+        {
+          "ty": "gr",
+          "it": [
+            {
+              "ty": "rc",
+              "d": 1,
+              "s": { "a": 0, "k": [150, 150], "ix": 2 },
+              "p": { "a": 0, "k": [0, 0], "ix": 3 },
+              "r": { "a": 0, "k": 0, "ix": 4 },
+              "nm": "Rectangle Path 1",
+              "mn": "ADBE Vector Shape - Rect",
+              "hd": false
+            },
+            {
+              "ty": "fl",
+              "c": {
+                "a": 0,
+                "k": [0.271324008119, 0.323676015816, 0.880510995902, 1],
+                "ix": 4
+              },
+              "o": { "a": 0, "k": 100, "ix": 5 },
+              "r": 1,
+              "bm": 0,
+              "nm": "Fill 1",
+              "mn": "ADBE Vector Graphic - Fill",
+              "hd": false
+            },
+            {
+              "ty": "tr",
+              "p": { "a": 0, "k": [-128, -128], "ix": 2 },
+              "a": { "a": 0, "k": [0, 0], "ix": 1 },
+              "s": { "a": 0, "k": [100, 100], "ix": 3, "sid": "scale" },
+              "r": { "a": 0, "k": 0, "ix": 6, "sid": "rotation" },
+              "o": { "a": 0, "k": 100, "ix": 7, "sid": "opacity"},
+              "sk": { "a": 0, "k": 0, "ix": 4 },
+              "sa": { "a": 0, "k": 0, "ix": 5 },
+              "nm": "Transform"
+            }
+          ],
+          "nm": "Rectangle 1",
+          "np": 3,
+          "cix": 2,
+          "bm": 0,
+          "ix": 4,
+          "mn": "ADBE Vector Group",
+          "hd": false
+        }
+      ],
+      "ip": 0,
+      "op": 900.000036657751,
+      "st": 0,
+      "ct": 1,
+      "bm": 0
+    }
+  ],
+  "markers": [],
+  "props": {},
+  "slots": {
+    "rotation": {
+      "p": {
+        "a": 0,
+        "k": 0  
+      }
+    },
+    "opacity": {
+      "p": {
+        "a": 0,
+        "k": 100  
+      }
+    },
+    "scale": {
+      "p": {
+        "a": 0,
+        "k": [100,100]  
+      }
+    }
+  }
+}
diff --git a/schema/assets/image.json b/schema/assets/image.json
index 7272f76..c8d514e 100644
--- a/schema/assets/image.json
+++ b/schema/assets/image.json
@@ -7,6 +7,9 @@
         {
             "$ref": "#/$defs/assets/asset"
         },
+        {
+            "$ref": "#/$defs/helpers/slottable-object"
+        },
         {
             "type": "object",
             "properties": {
@@ -50,7 +53,12 @@
                     }
                 }
             ],
-            "required": ["w", "h", "p"]
+            "if": {
+                "required": ["sid"]
+            },
+            "else": {
+                "required": ["w", "h", "p"]
+            }
         }
     ]
 }
diff --git a/schema/composition/animation.json b/schema/composition/animation.json
index 518f624..96cdfc8 100644
--- a/schema/composition/animation.json
+++ b/schema/composition/animation.json
@@ -50,6 +50,14 @@
                     "items": {
                         "$ref": "#/$defs/helpers/marker"
                     }
+                },
+                "slots": {
+                    "title": "Slots",
+                    "description": "Dictionary of slot ids that that will replace matching properties.",
+                    "type": "object",
+                    "additionalProperties": {
+                        "$ref": "#/$defs/helpers/slot"
+                    }
                 }
             },
             "required": ["w", "h", "fr", "op", "ip"]
diff --git a/schema/helpers/slot.json b/schema/helpers/slot.json
new file mode 100644
index 0000000..941a9ef
--- /dev/null
+++ b/schema/helpers/slot.json
@@ -0,0 +1,13 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "type": "object",
+    "title": "Slot",
+    "description": "Defines a property value that will be set to all matched properties",
+    "properties": {
+        "p": {
+            "title": "Property Value",
+            "description": "Property Value"
+        }
+    },
+    "required": ["p"]
+}
diff --git a/schema/helpers/slottable-object.json b/schema/helpers/slottable-object.json
new file mode 100644
index 0000000..1f3bd77
--- /dev/null
+++ b/schema/helpers/slottable-object.json
@@ -0,0 +1,13 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "type": "object",
+    "title": "Slottable Object",
+    "description": "Object that may have it's value replaced with a slot value",
+    "properties": {
+        "sid": {
+            "title": "Slot Id",
+            "description": "Identifier to look up the slot",
+            "type": "string"
+        }
+    }
+}
\ No newline at end of file
diff --git a/schema/helpers/slottable-property.json b/schema/helpers/slottable-property.json
new file mode 100644
index 0000000..d07016b
--- /dev/null
+++ b/schema/helpers/slottable-property.json
@@ -0,0 +1,17 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "type": "object",
+    "title": "Slottable Property",
+    "description": "Property that may have it's value replaced with a slot value",
+    "allOf": [
+        {
+            "$ref": "#/$defs/helpers/slottable-object"
+        }
+    ],
+    "if": {
+        "required": ["sid"]
+    },
+    "else": {
+        "required": ["a", "k"]
+    }
+}
\ No newline at end of file
diff --git a/schema/properties/color-property.json b/schema/properties/color-property.json
index d6cbfb4..62461ac 100644
--- a/schema/properties/color-property.json
+++ b/schema/properties/color-property.json
@@ -3,6 +3,11 @@
     "type": "object",
     "title": "Color Property",
     "description": "An animatable property that holds a Color",
+    "allOf": [
+        {
+            "$ref": "#/$defs/helpers/slottable-property"
+        }
+    ],
     "oneOf": [
         {
             "$comment": "Not animated",
@@ -38,6 +43,5 @@
                     }
                 }
         }
-    ],
-    "required": ["a", "k"]
+    ]
 }
diff --git a/schema/properties/scalar-property.json b/schema/properties/scalar-property.json
index 1edd019..0f87353 100644
--- a/schema/properties/scalar-property.json
+++ b/schema/properties/scalar-property.json
@@ -3,6 +3,11 @@
     "type": "object",
     "title": "Scalar Property",
     "description": "An animatable property that holds a float",
+    "allOf": [
+        {
+            "$ref": "#/$defs/helpers/slottable-property"
+        }
+    ],
     "oneOf": [
         {
             "$comment": "Not animated",
@@ -39,5 +44,11 @@
             }
         }
     ],
-    "required": ["a", "k"]
+    "properties": {
+        "sid": {
+            "title": "Slot Id",
+            "description": "Identifier for a property that can be replaced at runtime",
+            "type": "string"
+        }
+    }
 }
diff --git a/schema/properties/vector-property.json b/schema/properties/vector-property.json
index 0a8b6f9..020be30 100644
--- a/schema/properties/vector-property.json
+++ b/schema/properties/vector-property.json
@@ -3,6 +3,11 @@
     "type": "object",
     "title": "Vector Property",
     "description": "An animatable property that holds an array of numbers",
+    "allOf": [
+        {
+            "$ref": "#/$defs/helpers/slottable-property"
+        }
+    ],
     "oneOf": [
         {
             "$comment": "Not animated",
@@ -39,6 +44,5 @@
                 }
             }
         }
-    ],
-    "required": ["a", "k"]
+    ]
 }