diff --git a/src/LGraph.ts b/src/LGraph.ts
index e2633e981..60c866efb 100644
--- a/src/LGraph.ts
+++ b/src/LGraph.ts
@@ -14,6 +14,9 @@ import type {
   SerialisableGraph,
   SerialisableReroute,
 } from "./types/serialisation"
+import type { UUID } from "@/utils/uuid"
+
+import { createUuidv4, zeroUuid } from "@/utils/uuid"
 
 import { LGraphCanvas } from "./LGraphCanvas"
 import { LGraphGroup } from "./LGraphGroup"
@@ -66,6 +69,9 @@ export class LGraph implements LinkNetwork, Serialisable<SerialisableGraph> {
   static STATUS_STOPPED = 1
   static STATUS_RUNNING = 2
 
+  id: UUID = zeroUuid
+  revision: number = 0
+
   _version: number = -1
   /** The backing store for links.  Keys are wrapped in String() */
   _links: Map<LinkId, LLink> = new Map()
@@ -1513,6 +1519,8 @@ export class LGraph implements LinkNetwork, Serialisable<SerialisableGraph> {
 
     extra.reroutes = reroutes?.length ? reroutes : undefined
     return {
+      id: this.id,
+      revision: this.revision,
       last_node_id: state.lastNodeId,
       last_link_id: state.lastLinkId,
       nodes,
@@ -1534,7 +1542,7 @@ export class LGraph implements LinkNetwork, Serialisable<SerialisableGraph> {
    * It is intended for use with {@link structuredClone} or {@link JSON.stringify}.
    */
   asSerialisable(options?: { sortNodes: boolean }): SerialisableGraph & Required<Pick<SerialisableGraph, "nodes" | "groups" | "extra">> {
-    const { config, state, extra } = this
+    const { id, revision, config, state, extra } = this
 
     const nodeList = !LiteGraph.use_uuids && options?.sortNodes
       // @ts-expect-error If LiteGraph.use_uuids is false, ids are numbers.
@@ -1549,6 +1557,8 @@ export class LGraph implements LinkNetwork, Serialisable<SerialisableGraph> {
     const reroutes = this.reroutes.size ? [...this.reroutes.values()].map(x => x.asSerialisable()) : undefined
 
     const data: ReturnType<typeof this.asSerialisable> = {
+      id,
+      revision,
       version: LGraph.serialisedSchemaVersion,
       config,
       state,
@@ -1578,6 +1588,10 @@ export class LGraph implements LinkNetwork, Serialisable<SerialisableGraph> {
     if (!data) return
     if (!keep_old) this.clear()
 
+    // Create a new graph ID if none is provided
+    if (data.id) this.id = data.id
+    else if (this.id === zeroUuid) this.id = createUuidv4()
+
     let reroutes: SerialisableReroute[] | undefined
 
     // TODO: Determine whether this should this fall back to 0.4.
@@ -1665,7 +1679,7 @@ export class LGraph implements LinkNetwork, Serialisable<SerialisableGraph> {
     // copy all stored fields
     for (const i in data) {
       // links must be accepted
-      if (["nodes", "groups", "links", "state", "reroutes", "floatingLinks"].includes(i)) {
+      if (["nodes", "groups", "links", "state", "reroutes", "floatingLinks", "id"].includes(i)) {
         continue
       }
       // @ts-expect-error #574 Legacy property assignment
diff --git a/src/LiteGraphGlobal.ts b/src/LiteGraphGlobal.ts
index b6db26c13..77ba08102 100644
--- a/src/LiteGraphGlobal.ts
+++ b/src/LiteGraphGlobal.ts
@@ -19,6 +19,7 @@ import {
   RenderShape,
   TitleMode,
 } from "./types/globalEnums"
+import { createUuidv4 } from "./utils/uuid"
 
 /**
  * The Global Scope. It contains all the registered node classes.
@@ -549,14 +550,8 @@ export class LiteGraphGlobal {
     return target
   }
 
-  /*
-   * https://gist.github.com/jed/982883?permalink_comment_id=852670#gistcomment-852670
-   */
-  uuidv4(): string {
-    // @ts-expect-error
-    return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replaceAll(/[018]/g, a =>
-      (a ^ ((Math.random() * 16) >> (a / 4))).toString(16))
-  }
+  /** @see {@link createUuidv4} @inheritdoc */
+  uuidv4 = createUuidv4
 
   /**
    * Returns if the types of two slots are compatible (taking into account wildcards, etc)
diff --git a/src/types/serialisation.ts b/src/types/serialisation.ts
index 404525971..2f250ec93 100644
--- a/src/types/serialisation.ts
+++ b/src/types/serialisation.ts
@@ -15,6 +15,7 @@ import type { LinkId, SerialisedLLinkArray } from "../LLink"
 import type { FloatingRerouteSlot, RerouteId } from "../Reroute"
 import type { TWidgetValue } from "../types/widgets"
 import type { RenderShape } from "./globalEnums"
+import type { UUID } from "@/utils/uuid"
 
 /**
  * An object that implements custom pre-serialization logic via {@link Serialisable.asSerialisable}.
@@ -29,6 +30,9 @@ export interface Serialisable<SerialisableObject> {
 }
 
 export interface SerialisableGraph {
+  /** Unique graph ID.  Automatically generated if not provided. */
+  id: UUID
+  revision: number
   /** Schema version.  @remarks Version bump should add to const union, which is used to narrow type during deserialise. */
   version: 0 | 1
   config: LGraphConfig
@@ -80,6 +84,8 @@ export interface ISerialisedNode {
  * Maintained for backwards compat
  */
 export interface ISerialisedGraph {
+  id: UUID
+  revision: number
   last_node_id: NodeId
   last_link_id: number
   nodes: ISerialisedNode[]
diff --git a/src/utils/uuid.ts b/src/utils/uuid.ts
new file mode 100644
index 000000000..157813e43
--- /dev/null
+++ b/src/utils/uuid.ts
@@ -0,0 +1,29 @@
+export type UUID = `${string}-${string}-${string}-${string}-${string}`
+
+/** Special-case zero-UUID, consisting entirely of zeros. Used as a default value. */
+export const zeroUuid = "00000000-0000-0000-0000-000000000000"
+
+/** Pre-allocated storage for uuid random values. */
+const randomStorage = new Uint32Array(31)
+
+/**
+ * Creates a UUIDv4 string.
+ * @returns A new UUIDv4 string
+ * @remarks
+ * Original implementation from https://gist.github.com/jed/982883?permalink_comment_id=852670#gistcomment-852670
+ *
+ * Prefers the {@link crypto.randomUUID} method if available, falling back to
+ * {@link crypto.getRandomValues}, then finally the legacy {@link Math.random} method.
+ */
+export function createUuidv4(): UUID {
+  if (typeof crypto?.randomUUID === "function") return crypto.randomUUID()
+  // Assertion: `replaceAll` returns `string`; UUID format must be asserted below
+  if (typeof crypto?.getRandomValues === "function") {
+    const random = crypto.getRandomValues(randomStorage)
+    let i = 0
+    return "10000000-1000-4000-8000-100000000000".replaceAll(/[018]/g, a =>
+      (Number(a) ^ ((random[i++] * 3.725_290_298_461_914e-9) >> (Number(a) * 0.25))).toString(16)) as UUID
+  }
+  return "10000000-1000-4000-8000-100000000000".replaceAll(/[018]/g, a =>
+    (Number(a) ^ ((Math.random() * 16) >> (Number(a) * 0.25))).toString(16)) as UUID
+}
diff --git a/test/__snapshots__/ConfigureGraph.test.ts.snap b/test/__snapshots__/ConfigureGraph.test.ts.snap
index b6c0bc2cf..91d5ecf47 100644
--- a/test/__snapshots__/ConfigureGraph.test.ts.snap
+++ b/test/__snapshots__/ConfigureGraph.test.ts.snap
@@ -240,6 +240,7 @@ LGraph {
   "fixedtime": 0,
   "fixedtime_lapse": 0.01,
   "globaltime": 0,
+  "id": "ca9da7d8-fddd-4707-ad32-67be9be13140",
   "inputs": {},
   "iteration": 0,
   "last_update_time": 0,
@@ -249,6 +250,7 @@ LGraph {
   "nodes_executedAction": [],
   "nodes_executing": [],
   "outputs": {},
+  "revision": 0,
   "runningtime": 0,
   "starttime": 0,
   "state": {
@@ -285,6 +287,7 @@ LGraph {
   "fixedtime": 0,
   "fixedtime_lapse": 0.01,
   "globaltime": 0,
+  "id": "d175890f-716a-4ece-ba33-1d17a513b7be",
   "inputs": {},
   "iteration": 0,
   "last_update_time": 0,
@@ -294,6 +297,7 @@ LGraph {
   "nodes_executedAction": [],
   "nodes_executing": [],
   "outputs": {},
+  "revision": 0,
   "runningtime": 0,
   "starttime": 0,
   "state": {
diff --git a/test/__snapshots__/LGraph.test.ts.snap b/test/__snapshots__/LGraph.test.ts.snap
index 84aea52ad..567bed734 100644
--- a/test/__snapshots__/LGraph.test.ts.snap
+++ b/test/__snapshots__/LGraph.test.ts.snap
@@ -246,6 +246,7 @@ LGraph {
   "fixedtime": 0,
   "fixedtime_lapse": 0.01,
   "globaltime": 0,
+  "id": "b4e984f1-b421-4d24-b8b4-ff895793af13",
   "inputs": {},
   "iteration": 0,
   "last_update_time": 0,
@@ -255,6 +256,7 @@ LGraph {
   "nodes_executedAction": [],
   "nodes_executing": [],
   "outputs": {},
+  "revision": 0,
   "runningtime": 0,
   "starttime": 0,
   "state": {
diff --git a/test/__snapshots__/LGraph_constructor.test.ts.snap b/test/__snapshots__/LGraph_constructor.test.ts.snap
index 80151bf91..d71d797f6 100644
--- a/test/__snapshots__/LGraph_constructor.test.ts.snap
+++ b/test/__snapshots__/LGraph_constructor.test.ts.snap
@@ -240,6 +240,7 @@ LGraph {
   "fixedtime": 0,
   "fixedtime_lapse": 0.01,
   "globaltime": 0,
+  "id": "ca9da7d8-fddd-4707-ad32-67be9be13140",
   "inputs": {},
   "iteration": 0,
   "last_update_time": 0,
@@ -249,6 +250,7 @@ LGraph {
   "nodes_executedAction": [],
   "nodes_executing": [],
   "outputs": {},
+  "revision": 0,
   "runningtime": 0,
   "starttime": 0,
   "state": {
@@ -285,6 +287,7 @@ LGraph {
   "fixedtime": 0,
   "fixedtime_lapse": 0.01,
   "globaltime": 0,
+  "id": "d175890f-716a-4ece-ba33-1d17a513b7be",
   "inputs": {},
   "iteration": 0,
   "last_update_time": 0,
@@ -294,6 +297,7 @@ LGraph {
   "nodes_executedAction": [],
   "nodes_executing": [],
   "outputs": {},
+  "revision": 0,
   "runningtime": 0,
   "starttime": 0,
   "state": {
diff --git a/test/__snapshots__/litegraph.test.ts.snap b/test/__snapshots__/litegraph.test.ts.snap
index 5e3fe4727..d79354ad6 100644
--- a/test/__snapshots__/litegraph.test.ts.snap
+++ b/test/__snapshots__/litegraph.test.ts.snap
@@ -179,5 +179,6 @@ LiteGraphGlobal {
   "throw_errors": true,
   "use_legacy_node_error_indicator": false,
   "use_uuids": false,
+  "uuidv4": [Function],
 }
 `;
diff --git a/test/assets/testGraphs.ts b/test/assets/testGraphs.ts
index d7601aad7..a4e57671c 100644
--- a/test/assets/testGraphs.ts
+++ b/test/assets/testGraphs.ts
@@ -1,6 +1,8 @@
 import type { ISerialisedGraph, SerialisableGraph } from "@/litegraph"
 
 export const oldSchemaGraph: ISerialisedGraph = {
+  id: "b4e984f1-b421-4d24-b8b4-ff895793af13",
+  revision: 0,
   version: 0.4,
   config: {},
   last_node_id: 0,
@@ -23,6 +25,8 @@ export const oldSchemaGraph: ISerialisedGraph = {
 }
 
 export const minimalSerialisableGraph: SerialisableGraph = {
+  id: "d175890f-716a-4ece-ba33-1d17a513b7be",
+  revision: 0,
   version: 1,
   config: {},
   state: {
@@ -37,6 +41,8 @@ export const minimalSerialisableGraph: SerialisableGraph = {
 }
 
 export const basicSerialisableGraph: SerialisableGraph = {
+  id: "ca9da7d8-fddd-4707-ad32-67be9be13140",
+  revision: 0,
   version: 1,
   config: {},
   state: {