diff --git a/src/core/operations/BLAKE3.mjs b/src/core/operations/BLAKE3.mjs
index 53f7fdd6..a22eb0b8 100644
--- a/src/core/operations/BLAKE3.mjs
+++ b/src/core/operations/BLAKE3.mjs
@@ -30,7 +30,11 @@ class BLAKE3 extends Operation {
         this.args = [
             {
                 "name": "Size (bytes)",
-                "type": "number"
+                "type": "number",
+                "value": 16,
+                "min": 1,
+                "max": 65535, // arbitrary limit to prevent resource exhaustion
+                "integer": true,
             }, {
                 "name": "Key",
                 "type": "string",
diff --git a/tests/operations/tests/BLAKE3.mjs b/tests/operations/tests/BLAKE3.mjs
index b3c14e99..e15144b2 100644
--- a/tests/operations/tests/BLAKE3.mjs
+++ b/tests/operations/tests/BLAKE3.mjs
@@ -69,5 +69,43 @@ TestRegister.addTests([
             { "op": "BLAKE3",
                 "args": [16390, "ThiskeyisexactlythirtytwoBytesLo"] }
         ]
-    }
+    },
+// test vectors from https://github.com/BLAKE3-team/BLAKE3/blob/master/test_vectors/test_vectors.json
+    {
+        name: "BLAKE3: Std test vector - 0 bytes input, plain hash",
+        input: "",
+        expectedOutput: "af1349b9f5f9a1a6a0404dea36dcc9499bcb25c9adc112b7cc9a93cae41f3262e00f03e7b69af26b7faaf09fcd333050338ddfe085b8cc869ca98b206c08243a26f5487789e8f660afe6c99ef9e0c52b92e7393024a80459cf91f476f9ffdbda7001c22e159b402631f277ca96f2defdf1078282314e763699a31c5363165421cce14d",
+        recipeConfig: [
+            {
+                "op": "BLAKE3",
+                "args": [131, ""]
+            }
+        ]
+    },
+    {
+        name: "BLAKE3: Std test vector - 0 bytes input, keyed hash",
+        input: "",
+        expectedOutput: "92b2b75604ed3c761f9d6f62392c8a9227ad0ea3f09573e783f1498a4ed60d26b18171a2f22a4b94822c701f107153dba24918c4bae4d2945c20ece13387627d3b73cbf97b797d5e59948c7ef788f54372df45e45e4293c7dc18c1d41144a9758be58960856be1eabbe22c2653190de560ca3b2ac4aa692a9210694254c371e851bc8f",
+        recipeConfig: [
+            {
+                "op": "BLAKE3",
+                "args": [131, "whats the Elvish word for friend"]
+            }
+        ]
+    },
+    {
+        name: "BLAKE3: Std test vector - 7 bytes input, keyed hash",
+        input: "0001020304050607",
+        expectedOutput: "be2f5495c61cba1bb348a34948c004045e3bd4dae8f0fe82bf44d0da245a060048eb5e68ce6dea1eb0229e144f578b3aa7e9f4f85febd135df8525e6fe40c6f0340d13dd09b255ccd5112a94238f2be3c0b5b7ecde06580426a93e0708555a265305abf86d874e34b4995b788e37a823491f25127a502fe0704baa6bfdf04e76c13276",
+        recipeConfig: [
+            {
+                "op": "From Hex",
+                args: [],
+            },
+            {
+                "op": "BLAKE3",
+                "args": [131, "whats the Elvish word for friend"]
+            }
+        ]
+    },
 ]);