diff --git a/server/src/lib/__tests__/upload-images.test.js b/server/src/lib/__tests__/upload-images.test.js
new file mode 100644
index 0000000..d4ba6b9
--- /dev/null
+++ b/server/src/lib/__tests__/upload-images.test.js
@@ -0,0 +1,118 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import fs from 'node:fs'
+import path from 'node:path'
+import { persistMultipartImages } from '../upload-images.js'
+
+const UPLOADS_DIR = path.join(process.cwd(), 'uploads')
+const TEST_PREFIX = 'upload-test-'
+
+describe('persistMultipartImages with eager mode', () => {
+  afterEach(async () => {
+    const files = await fs.promises.readdir(UPLOADS_DIR).catch(() => [])
+    for (const file of files) {
+      if (file.startsWith(TEST_PREFIX)) {
+        await fs.promises.unlink(path.join(UPLOADS_DIR, file)).catch(() => {})
+      }
+    }
+    const cacheDir = path.join(UPLOADS_DIR, '.cache')
+    await fs.promises.rm(cacheDir, { recursive: true, force: true }).catch(() => {})
+  })
+
+  it('returns WebP URLs when eager=true', async () => {
+    const sharp = (await import('sharp')).default
+    const testImagePath = path.join(UPLOADS_DIR, `${TEST_PREFIX}original.png`)
+    await sharp({ create: { width: 100, height: 100, channels: 3, background: { r: 255, g: 0, b: 0 } } })
+      .png()
+      .toFile(testImagePath)
+
+    const filesBefore = await fs.promises.readdir(UPLOADS_DIR)
+
+    const mockRequest = {
+      isMultipart: () => true,
+      parts: async function* () {
+        const buffer = await fs.promises.readFile(testImagePath)
+        yield {
+          file: true,
+          filename: 'test.png',
+          toBuffer: async () => buffer,
+        }
+      },
+    }
+
+    const urls = await persistMultipartImages(mockRequest, {
+      maxFiles: 1,
+      maxFileBytes: 20 * 1024 * 1024,
+      subdir: '',
+      eager: true,
+    })
+
+    expect(urls).toHaveLength(1)
+    expect(urls[0]).toMatch(/\/uploads\/[a-f0-9-]+\.webp$/)
+
+    // Verify the intermediate PNG file written by persistMultipartImages was deleted
+    const filesAfter = await fs.promises.readdir(UPLOADS_DIR)
+    const newPngFiles = filesAfter.filter((f) => !filesBefore.includes(f) && f.endsWith('.png'))
+    expect(newPngFiles).toHaveLength(0)
+  })
+
+  it('returns original format URLs when eager=false', async () => {
+    const sharp = (await import('sharp')).default
+    const testImagePath = path.join(UPLOADS_DIR, `${TEST_PREFIX}original2.png`)
+    await sharp({ create: { width: 100, height: 100, channels: 3, background: { r: 0, g: 255, b: 0 } } })
+      .png()
+      .toFile(testImagePath)
+
+    const mockRequest = {
+      isMultipart: () => true,
+      parts: async function* () {
+        const buffer = await fs.promises.readFile(testImagePath)
+        yield {
+          file: true,
+          filename: 'test.png',
+          toBuffer: async () => buffer,
+        }
+      },
+    }
+
+    const urls = await persistMultipartImages(mockRequest, {
+      maxFiles: 1,
+      maxFileBytes: 20 * 1024 * 1024,
+      subdir: '',
+      eager: false,
+    })
+
+    expect(urls).toHaveLength(1)
+    expect(urls[0]).toMatch(/\/uploads\/[a-f0-9-]+\.png$/)
+  })
+
+  it('cleans up original file on eager processing error', async () => {
+    const invalidBuffer = Buffer.from('not an image')
+
+    const filesBefore = await fs.promises.readdir(UPLOADS_DIR)
+
+    const mockRequest = {
+      isMultipart: () => true,
+      parts: async function* () {
+        yield {
+          file: true,
+          filename: 'test.png',
+          toBuffer: async () => invalidBuffer,
+        }
+      },
+    }
+
+    await expect(
+      persistMultipartImages(mockRequest, {
+        maxFiles: 1,
+        maxFileBytes: 20 * 1024 * 1024,
+        subdir: '',
+        eager: true,
+      }),
+    ).rejects.toThrow()
+
+    // The intermediate file written by persistMultipartImages should be cleaned up
+    const filesAfter = await fs.promises.readdir(UPLOADS_DIR)
+    const newFiles = filesAfter.filter((f) => !filesBefore.includes(f) && f !== '.cache')
+    expect(newFiles).toHaveLength(0)
+  })
+})
diff --git a/server/src/lib/upload-images.js b/server/src/lib/upload-images.js
index 7d9195a..4d8f965 100644
--- a/server/src/lib/upload-images.js
+++ b/server/src/lib/upload-images.js
@@ -14,7 +14,7 @@ export function uploadError(message, statusCode = 400) {
   return err
 }
 
-export async function persistMultipartImages(request, { maxFiles = 10, maxFileBytes, subdir = '' }) {
+export async function persistMultipartImages(request, { maxFiles = 10, maxFileBytes, subdir = '', eager = false }) {
   if (!request.isMultipart()) {
     throw uploadError('Ожидается multipart/form-data')
   }
@@ -40,10 +40,25 @@ export async function persistMultipartImages(request, { maxFiles = 10, maxFileBy
       throw uploadError('Разрешены только файлы: png, jpg, jpeg, webp')
     }
 
-    const fileName = `${crypto.randomUUID()}${ext}`
+    const uuid = crypto.randomUUID()
+    const fileName = `${uuid}${ext}`
     const fullPath = path.join(targetDir, fileName)
     await fs.promises.writeFile(fullPath, await part.toBuffer())
-    urls.push(subdir ? `/uploads/${subdir}/${fileName}` : `/uploads/${fileName}`)
+
+    let finalUrl = subdir ? `/uploads/${subdir}/${fileName}` : `/uploads/${fileName}`
+
+    if (eager) {
+      try {
+        const { generateAllSizes, convertOriginalToWebp } = await import('./image-resize.js')
+        await generateAllSizes(uuid, subdir, fullPath)
+        finalUrl = await convertOriginalToWebp(uuid, subdir)
+      } catch (error) {
+        await fs.promises.unlink(fullPath).catch(() => {})
+        throw error
+      }
+    }
+
+    urls.push(finalUrl)
   }
 
   if (urls.length === 0) {