diff --git a/src/lib/mockupTemplates.ts b/src/lib/mockupTemplates.ts
new file mode 100644
index 0000000..cf5d570
--- /dev/null
+++ b/src/lib/mockupTemplates.ts
@@ -0,0 +1,62 @@
+import { readFile, writeFile, mkdir, unlink } from 'fs/promises'
+import { existsSync } from 'fs'
+import path from 'path'
+import { randomUUID } from 'crypto'
+import type { MockupTemplate } from '@/types/mockup'
+
+export const TEMPLATES_DIR = path.join(process.cwd(), 'data', 'mockup-templates')
+const IMAGES_DIR = path.join(TEMPLATES_DIR, 'images')
+const INDEX_PATH = path.join(TEMPLATES_DIR, 'index.json')
+
+async function ensureDirs() {
+  await mkdir(IMAGES_DIR, { recursive: true })
+}
+
+async function readIndex(): Promise<MockupTemplate[]> {
+  if (!existsSync(INDEX_PATH)) return []
+  const raw = await readFile(INDEX_PATH, 'utf-8')
+  return JSON.parse(raw) as MockupTemplate[]
+}
+
+async function writeIndex(templates: MockupTemplate[]): Promise<void> {
+  await ensureDirs()
+  await writeFile(INDEX_PATH, JSON.stringify(templates, null, 2))
+}
+
+export async function listTemplates(): Promise<MockupTemplate[]> {
+  return readIndex()
+}
+
+export async function listTemplatesByFamily(family: string): Promise<MockupTemplate[]> {
+  const all = await readIndex()
+  return all.filter(t => t.family === family)
+}
+
+export async function saveTemplate(
+  meta: Omit<MockupTemplate, 'id'>,
+  imageBuffer: Buffer,
+  ext: string,
+): Promise<MockupTemplate> {
+  await ensureDirs()
+  const id = randomUUID()
+  const filename = `${id}.${ext}`
+  await writeFile(path.join(IMAGES_DIR, filename), imageBuffer)
+  const template: MockupTemplate = { ...meta, id, filename }
+  const all = await readIndex()
+  all.push(template)
+  await writeIndex(all)
+  return template
+}
+
+export async function deleteTemplate(id: string): Promise<void> {
+  const all = await readIndex()
+  const tpl = all.find(t => t.id === id)
+  if (!tpl) throw new Error('Template not found')
+  const filePath = path.join(IMAGES_DIR, tpl.filename)
+  if (existsSync(filePath)) await unlink(filePath)
+  await writeIndex(all.filter(t => t.id !== id))
+}
+
+export function getTemplateImagePath(filename: string): string {
+  return path.join(IMAGES_DIR, filename)
+}
diff --git a/src/types/mockup.ts b/src/types/mockup.ts
new file mode 100644
index 0000000..68fe557
--- /dev/null
+++ b/src/types/mockup.ts
@@ -0,0 +1,20 @@
+export interface MockupTemplate {
+  id: string
+  name: string
+  family: string
+  filename: string
+  description: string
+}
+
+export interface MockupGenerateRequest {
+  templateId: string
+  productImageBase64: string
+  productName: string
+  dimensions?: string
+  family: string
+  instruction?: string
+}
+
+export interface MockupGenerateResult {
+  imageBase64: string
+}