diff --git a/src/store/utils/localStorage.ts b/src/store/utils/localStorage.ts
new file mode 100644
index 00000000..b7712fc8
--- /dev/null
+++ b/src/store/utils/localStorage.ts
@@ -0,0 +1,142 @@
+import { WorkflowSaveConfig, WorkflowCostData, ProviderSettings } from "@/types";
+
+// Storage keys
+export const STORAGE_KEY = "node-banana-workflow-configs";
+export const COST_DATA_STORAGE_KEY = "node-banana-workflow-costs";
+export const GENERATE_IMAGE_DEFAULTS_KEY = "node-banana-nanoBanana-defaults";
+export const PROVIDER_SETTINGS_KEY = "node-banana-provider-settings";
+
+// GenerateImage defaults interface
+export interface GenerateImageDefaults {
+  aspectRatio: string;
+  resolution: string;
+  model: string;
+  useGoogleSearch: boolean;
+}
+
+const DEFAULT_GENERATE_IMAGE_SETTINGS: GenerateImageDefaults = {
+  aspectRatio: "1:1",
+  resolution: "1K",
+  model: "nano-banana-pro",
+  useGoogleSearch: false,
+};
+
+// Default provider settings
+export const defaultProviderSettings: ProviderSettings = {
+  providers: {
+    gemini: { id: "gemini", name: "Google Gemini", enabled: true, apiKey: null, apiKeyEnvVar: "GEMINI_API_KEY" },
+    openai: { id: "openai", name: "OpenAI", enabled: true, apiKey: null, apiKeyEnvVar: "OPENAI_API_KEY" },
+    replicate: { id: "replicate", name: "Replicate", enabled: false, apiKey: null, apiKeyEnvVar: "REPLICATE_API_KEY" },
+    fal: { id: "fal", name: "fal.ai", enabled: false, apiKey: null, apiKeyEnvVar: "FAL_API_KEY" },
+  }
+};
+
+// Workflow configs helpers
+export const loadSaveConfigs = (): Record<string, WorkflowSaveConfig> => {
+  if (typeof window === "undefined") return {};
+  const stored = localStorage.getItem(STORAGE_KEY);
+  return stored ? JSON.parse(stored) : {};
+};
+
+export const saveSaveConfig = (config: WorkflowSaveConfig): void => {
+  if (typeof window === "undefined") return;
+  const configs = loadSaveConfigs();
+  configs[config.workflowId] = config;
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(configs));
+};
+
+// Cost data helpers
+export const loadWorkflowCostData = (workflowId: string): WorkflowCostData | null => {
+  if (typeof window === "undefined") return null;
+  const stored = localStorage.getItem(COST_DATA_STORAGE_KEY);
+  if (!stored) return null;
+  try {
+    const allCosts: Record<string, WorkflowCostData> = JSON.parse(stored);
+    return allCosts[workflowId] || null;
+  } catch {
+    return null;
+  }
+};
+
+export const saveWorkflowCostData = (data: WorkflowCostData): void => {
+  if (typeof window === "undefined") return;
+  const stored = localStorage.getItem(COST_DATA_STORAGE_KEY);
+  let allCosts: Record<string, WorkflowCostData> = {};
+  if (stored) {
+    try {
+      allCosts = JSON.parse(stored);
+    } catch {
+      allCosts = {};
+    }
+  }
+  allCosts[data.workflowId] = data;
+  localStorage.setItem(COST_DATA_STORAGE_KEY, JSON.stringify(allCosts));
+};
+
+// GenerateImage defaults helpers
+export const loadGenerateImageDefaults = (): GenerateImageDefaults => {
+  if (typeof window === "undefined") {
+    return DEFAULT_GENERATE_IMAGE_SETTINGS;
+  }
+  const stored = localStorage.getItem(GENERATE_IMAGE_DEFAULTS_KEY);
+  if (stored) {
+    try {
+      return JSON.parse(stored);
+    } catch {
+      return DEFAULT_GENERATE_IMAGE_SETTINGS;
+    }
+  }
+  return DEFAULT_GENERATE_IMAGE_SETTINGS;
+};
+
+export const saveGenerateImageDefaults = (settings: Partial<GenerateImageDefaults>): void => {
+  if (typeof window === "undefined") return;
+  const current = loadGenerateImageDefaults();
+  const updated = { ...current, ...settings };
+  localStorage.setItem(GENERATE_IMAGE_DEFAULTS_KEY, JSON.stringify(updated));
+};
+
+// Provider settings helpers
+export const getProviderSettings = (): ProviderSettings => {
+  if (typeof window === "undefined") return defaultProviderSettings;
+  const stored = localStorage.getItem(PROVIDER_SETTINGS_KEY);
+  if (stored) {
+    try {
+      const parsed = JSON.parse(stored) as ProviderSettings;
+      // Merge with defaults to handle new providers added after user saved settings
+      return {
+        providers: {
+          ...defaultProviderSettings.providers,
+          ...parsed.providers,
+        }
+      };
+    } catch {
+      return defaultProviderSettings;
+    }
+  }
+  return defaultProviderSettings;
+};
+
+export const saveProviderSettings = (settings: ProviderSettings): void => {
+  if (typeof window === "undefined") return;
+  localStorage.setItem(PROVIDER_SETTINGS_KEY, JSON.stringify(settings));
+};
+
+// Workflow ID generator
+export const generateWorkflowId = (): string =>
+  `wf_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
+
+/**
+ * @deprecated Backward-compatible alias. Use `GenerateImageDefaults` instead.
+ */
+export type NanoBananaDefaults = GenerateImageDefaults;
+
+/**
+ * @deprecated Backward-compatible alias. Use `loadGenerateImageDefaults` instead.
+ */
+export const loadNanoBananaDefaults = loadGenerateImageDefaults;
+
+/**
+ * @deprecated Backward-compatible alias. Use `saveGenerateImageDefaults` instead.
+ */
+export const saveNanoBananaDefaults = saveGenerateImageDefaults;
diff --git a/src/store/workflowStore.ts b/src/store/workflowStore.ts
index 0909fbf9..a78bf962 100644
--- a/src/store/workflowStore.ts
+++ b/src/store/workflowStore.ts
@@ -22,8 +22,6 @@ import {
   OutputNodeData,
   WorkflowNodeData,
   ImageHistoryItem,
-  WorkflowSaveConfig,
-  WorkflowCostData,
   NodeGroup,
   GroupColor,
   ProviderType,
@@ -34,6 +32,20 @@ import { useToast } from "@/components/Toast";
 import { calculateGenerationCost } from "@/utils/costCalculator";
 import { logger } from "@/utils/logger";
 import { externalizeWorkflowImages, hydrateWorkflowImages } from "@/utils/imageStorage";
+import {
+  loadSaveConfigs,
+  saveSaveConfig,
+  loadWorkflowCostData,
+  saveWorkflowCostData,
+  loadGenerateImageDefaults,
+  saveGenerateImageDefaults,
+  getProviderSettings,
+  saveProviderSettings,
+  defaultProviderSettings,
+  generateWorkflowId,
+  // Re-export backward-compatible aliases
+  type GenerateImageDefaults,
+} from "./utils/localStorage";
 
 export type EdgeStyle = "angular" | "curved";
 
@@ -189,7 +201,7 @@ const createDefaultNodeData = (type: NodeType): WorkflowNodeData => {
         prompt: "",
       } as PromptNodeData;
     case "nanoBanana": {
-      const defaults = loadNanoBananaDefaults();
+      const defaults = loadGenerateImageDefaults();
       const modelDisplayName = defaults.model === "nano-banana" ? "Nano Banana" : "Nano Banana Pro";
       const defaultSelectedModel: SelectedModel = {
         provider: "gemini",
@@ -277,133 +289,8 @@ const GROUP_COLOR_ORDER: GroupColor[] = [
   "neutral", "blue", "green", "purple", "orange", "red"
 ];
 
-// localStorage helpers for auto-save configs
-const STORAGE_KEY = "node-banana-workflow-configs";
-
-// localStorage helpers for cost tracking
-const COST_DATA_STORAGE_KEY = "node-banana-workflow-costs";
-
-const loadWorkflowCostData = (workflowId: string): WorkflowCostData | null => {
-  if (typeof window === "undefined") return null;
-  const stored = localStorage.getItem(COST_DATA_STORAGE_KEY);
-  if (!stored) return null;
-  try {
-    const allCosts: Record<string, WorkflowCostData> = JSON.parse(stored);
-    return allCosts[workflowId] || null;
-  } catch {
-    return null;
-  }
-};
-
-const saveWorkflowCostData = (data: WorkflowCostData): void => {
-  if (typeof window === "undefined") return;
-  const stored = localStorage.getItem(COST_DATA_STORAGE_KEY);
-  let allCosts: Record<string, WorkflowCostData> = {};
-  if (stored) {
-    try {
-      allCosts = JSON.parse(stored);
-    } catch {
-      allCosts = {};
-    }
-  }
-  allCosts[data.workflowId] = data;
-  localStorage.setItem(COST_DATA_STORAGE_KEY, JSON.stringify(allCosts));
-};
-
-// localStorage helpers for GenerateImage sticky settings
-const GENERATE_IMAGE_DEFAULTS_KEY = "node-banana-nanoBanana-defaults";
-
-interface GenerateImageDefaults {
-  aspectRatio: string;
-  resolution: string;
-  model: string;
-  useGoogleSearch: boolean;
-}
-
-const loadGenerateImageDefaults = (): GenerateImageDefaults => {
-  if (typeof window === "undefined") {
-    return { aspectRatio: "1:1", resolution: "1K", model: "nano-banana-pro", useGoogleSearch: false };
-  }
-  const stored = localStorage.getItem(GENERATE_IMAGE_DEFAULTS_KEY);
-  if (stored) {
-    try {
-      return JSON.parse(stored);
-    } catch {
-      return { aspectRatio: "1:1", resolution: "1K", model: "nano-banana-pro", useGoogleSearch: false };
-    }
-  }
-  return { aspectRatio: "1:1", resolution: "1K", model: "nano-banana-pro", useGoogleSearch: false };
-};
-
-export const saveGenerateImageDefaults = (settings: Partial<GenerateImageDefaults>) => {
-  if (typeof window === "undefined") return;
-  const current = loadGenerateImageDefaults();
-  const updated = { ...current, ...settings };
-  localStorage.setItem(GENERATE_IMAGE_DEFAULTS_KEY, JSON.stringify(updated));
-};
-
-/**
- * @deprecated Backward-compatible aliases. Use `GenerateImageDefaults` and `saveGenerateImageDefaults` instead.
- */
-type NanoBananaDefaults = GenerateImageDefaults;
-const loadNanoBananaDefaults = loadGenerateImageDefaults;
-/** @deprecated Use `saveGenerateImageDefaults` instead */
-export const saveNanoBananaDefaults = saveGenerateImageDefaults;
-
-// localStorage helpers for provider settings
-const PROVIDER_SETTINGS_KEY = "node-banana-provider-settings";
-
-const defaultProviderSettings: ProviderSettings = {
-  providers: {
-    gemini: { id: "gemini", name: "Google Gemini", enabled: true, apiKey: null, apiKeyEnvVar: "GEMINI_API_KEY" },
-    openai: { id: "openai", name: "OpenAI", enabled: true, apiKey: null, apiKeyEnvVar: "OPENAI_API_KEY" },
-    replicate: { id: "replicate", name: "Replicate", enabled: false, apiKey: null, apiKeyEnvVar: "REPLICATE_API_KEY" },
-    fal: { id: "fal", name: "fal.ai", enabled: false, apiKey: null, apiKeyEnvVar: "FAL_API_KEY" },
-  }
-};
-
-const getProviderSettings = (): ProviderSettings => {
-  if (typeof window === "undefined") return defaultProviderSettings;
-  const stored = localStorage.getItem(PROVIDER_SETTINGS_KEY);
-  if (stored) {
-    try {
-      const parsed = JSON.parse(stored) as ProviderSettings;
-      // Merge with defaults to handle new providers added after user saved settings
-      return {
-        providers: {
-          ...defaultProviderSettings.providers,
-          ...parsed.providers,
-        }
-      };
-    } catch {
-      return defaultProviderSettings;
-    }
-  }
-  return defaultProviderSettings;
-};
-
-const saveProviderSettings = (settings: ProviderSettings): void => {
-  if (typeof window === "undefined") return;
-  localStorage.setItem(PROVIDER_SETTINGS_KEY, JSON.stringify(settings));
-};
-
-const generateWorkflowId = () =>
-  `wf_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
-
-const loadSaveConfigs = (): Record<string, WorkflowSaveConfig> => {
-  if (typeof window === "undefined") return {};
-  const stored = localStorage.getItem(STORAGE_KEY);
-  return stored ? JSON.parse(stored) : {};
-};
-
-const saveSaveConfig = (config: WorkflowSaveConfig) => {
-  if (typeof window === "undefined") return;
-  const configs = loadSaveConfigs();
-  configs[config.workflowId] = config;
-  localStorage.setItem(STORAGE_KEY, JSON.stringify(configs));
-};
-
-export { generateWorkflowId };
+// Re-export for backward compatibility
+export { generateWorkflowId, saveGenerateImageDefaults, saveNanoBananaDefaults } from "./utils/localStorage";
 
 export const useWorkflowStore = create<WorkflowStore>((set, get) => ({
   nodes: [],