diff --git a/frondend/package-lock.json b/frondend/package-lock.json
index 7db3f8b..ecf9b99 100644
--- a/frondend/package-lock.json
+++ b/frondend/package-lock.json
@@ -11,6 +11,7 @@
         "axios": "^1.13.6",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
+        "jsqr": "^1.4.0",
         "lucide-vue-next": "^1.0.0",
         "qrcode": "^1.5.4",
         "reka-ui": "^2.10.4",
@@ -1954,6 +1955,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/jsqr": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/jsqr/-/jsqr-1.4.0.tgz",
+      "integrity": "sha512-dxLob7q65Xg2DvstYkRpkYtmKm2sPJ9oFhrhmudT1dZvNFFTlroai3AWSpLey/w5vMcLBXRgOJsbXpdN9HzU/A=="
+    },
     "node_modules/lightningcss": {
       "version": "1.33.0",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.33.0.tgz",
diff --git a/frondend/package.json b/frondend/package.json
index fe29d00..a9d0c6f 100644
--- a/frondend/package.json
+++ b/frondend/package.json
@@ -12,6 +12,7 @@
     "axios": "^1.13.6",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "jsqr": "^1.4.0",
     "lucide-vue-next": "^1.0.0",
     "qrcode": "^1.5.4",
     "reka-ui": "^2.10.4",
diff --git a/frondend/src/views/home/HomeView.vue b/frondend/src/views/home/HomeView.vue
index 9670c93..0b4dedc 100644
--- a/frondend/src/views/home/HomeView.vue
+++ b/frondend/src/views/home/HomeView.vue
@@ -4,11 +4,12 @@ import { useRouter } from 'vue-router'
 import { CheckCircle, Clock, Bell, Calendar, Plus, Play, Trash2, ListTodo, MapPin, LoaderCircle, Edit3, Upload, Pencil, X, Gift, Smartphone, Star } from 'lucide-vue-next'
 import { Button } from '@/components/ui/button'
 import AppDialog from '@/components/ui/dialog/AppDialog.vue'
+import jsQR from 'jsqr'
 import * as authApi from '@/api/auth'
 import { CPD_PASSWORD_ERROR } from '@/api'
 import { useMessage } from '@/composables/useMessage'
 
-const { message } = useMessage()
+const message = useMessage()
 const router = useRouter()
 const loading = ref(true)
 
@@ -344,54 +345,182 @@ function authHeaders(): Record<string, string> {
   return { 'Authorization': 'Bearer ' + token, 'Content-Type': 'application/json' }
 }
 
+// ======== 从二维码文本中提取 uuid（兼容完整链接、纯 uuid）========
+function extractQrUuid(text: string): string {
+  const m = /uuid=([0-9a-zA-Z_-]+)/.exec(text)
+  if (m) return m[1]
+  const t = text.trim()
+  return /^[0-9a-zA-Z_-]{8,64}$/.test(t) ? t : ''
+}
+
+// ======== 前端解码二维码（jsQR）：读取文件 → 绘制到 canvas → 取像素解码 ========
+// 支持多尺度尝试，提高"拍摄屏幕"这类低质量图片的识别率。
+function decodeQrInBrowser(file: File): Promise<string> {
+  return new Promise((resolve) => {
+    const url = URL.createObjectURL(file)
+    const img = new Image()
+    img.onload = () => {
+      try {
+        const scales = [1, 0.6, 0.4, 1.5]
+        for (const s of scales) {
+          const w = Math.max(1, Math.round(img.naturalWidth * s))
+          const h = Math.max(1, Math.round(img.naturalHeight * s))
+          // 限制最长边，避免超大图（如 4032x3024）绘制过慢
+          const cap = 1600
+          const ratio = Math.min(1, cap / Math.max(w, h))
+          const cw = Math.max(1, Math.round(w * ratio))
+          const ch = Math.max(1, Math.round(h * ratio))
+          const canvas = document.createElement('canvas')
+          canvas.width = cw
+          canvas.height = ch
+          const ctx = canvas.getContext('2d')
+          if (!ctx) continue
+          ctx.drawImage(img, 0, 0, cw, ch)
+          const data = ctx.getImageData(0, 0, cw, ch)
+          const code = jsQR(data.data, cw, ch, { inversionAttempts: 'attemptBoth' })
+          if (code?.data) {
+            URL.revokeObjectURL(url)
+            resolve(code.data)
+            return
+          }
+        }
+        URL.revokeObjectURL(url)
+        resolve('')
+      } catch {
+        URL.revokeObjectURL(url)
+        resolve('')
+      }
+    }
+    img.onerror = () => {
+      URL.revokeObjectURL(url)
+      resolve('')
+    }
+    img.src = url
+  })
+}
+
+// ======== 前端压缩图片（默认目标 ≤300KB），返回压缩后的 File ========
+// 仅对签到照片等需上传 OBS 的图片使用；二维码不上传、无需压缩。
+async function compressImage(file: File, maxBytes = 300 * 1024): Promise<File> {
+  if (file.size <= maxBytes) return file
+  const dataUrl = await new Promise<string>((resolve) => {
+    const r = new FileReader()
+    r.onload = (e) => resolve((e.target?.result as string) || '')
+    r.onerror = () => resolve('')
+    r.readAsDataURL(file)
+  })
+  if (!dataUrl) return file
+
+  const img = await new Promise<HTMLImageElement | null>((resolve) => {
+    const i = new Image()
+    i.onload = () => resolve(i)
+    i.onerror = () => resolve(null)
+    i.src = dataUrl
+  })
+  if (!img) return file
+
+  const canvas = document.createElement('canvas')
+  const ctx = canvas.getContext('2d')
+  if (!ctx) return file
+
+  // 逐步降低质量/尺寸，直到体积达标（下限保证清晰度）
+  let scale = 1
+  let quality = 0.85
+  let out: Blob | null = null
+  for (let i = 0; i < 8; i++) {
+    const w = Math.max(1, Math.round(img.naturalWidth * scale))
+    const h = Math.max(1, Math.round(img.naturalHeight * scale))
+    canvas.width = w
+    canvas.height = h
+    ctx.clearRect(0, 0, w, h)
+    ctx.drawImage(img, 0, 0, w, h)
+    out = await new Promise<Blob | null>((resolve) =>
+      canvas.toBlob((b) => resolve(b), 'image/jpeg', quality),
+    )
+    if (!out) break
+    if (out.size <= maxBytes) break
+    // 先降质量，质量到底后再降尺寸
+    if (quality > 0.5) quality -= 0.15
+    else scale *= 0.8
+    if (scale < 0.3) break
+  }
+  if (!out) return file
+  const name = file.name.replace(/\.[^.]+$/, '') + '.jpg'
+  return new File([out], name, { type: 'image/jpeg' })
+}
+
 // ======== 图片上传 → 浏览器直传到今日校园 OBS（不经过服务器中转），成功后立即保存表单 ========
 const uploadingImage = ref(false)
+const uploadingLabel = ref('上传中...')
 async function handleImageUpload(index: number, isEdit: boolean) {
   if (uploadingImage.value) return
   const input = document.createElement('input')
   input.type = 'file'
   input.accept = 'image/*'
   input.onchange = async () => {
-    const file = input.files?.[0]
-    if (!file) return
+    const picked = input.files?.[0]
+    if (!picked) return
     const taskType = isEdit ? (editTask.value?.taskType || 'sign') : (selectedItem.value?.taskType || 'sign')
     const items = isEdit ? editFormItems.value : formItems.value
 
-    // 二维码字段：仅解析出 uuid 保存（不存整张图片，避免 formData 达数 MB）
-    if (isQrField(items[index])) {
-      const qrReader = new FileReader()
-      qrReader.onload = async (e) => {
-        const dataUrl = (e.target?.result as string) || ''
-        if (!dataUrl) return
-        try {
-          const res = await authApi.decodeQr(dataUrl)
-          const uuid = res.data.data.uuid
-          if (!uuid) {
-            message.error('未识别到二维码，请重新上传清晰的二维码图片')
-            return
-          }
-          items[index].content = uuid
-          message.success('二维码已解析')
-        } catch (err: any) {
-          message.error(err?.response?.data?.message || '二维码解析失败，请重新上传')
-        }
-      }
-      qrReader.readAsDataURL(file)
-      return
-    }
-
     // 记录原值：任何失败路径都回滚，避免本地预览的 base64 被当成正式值保存入库
     const prevContent = items[index].content || ''
 
-    // 先显示本地预览（仅界面展示，上传成功后会覆盖为 OBS 正式 URL）
-    const reader = new FileReader()
-    reader.onload = (e) => {
-      items[index].content = (e.target?.result as string) || ''
+    // ---- 二维码字段：前端 jsQR 直接解析出 uuid，不上传、不压缩 ----
+    if (isQrField(items[index])) {
+      uploadingImage.value = true
+      uploadingLabel.value = '解析二维码中...'
+      try {
+        const text = await decodeQrInBrowser(picked)
+        let uuid = text ? extractQrUuid(text) : ''
+        // 前端识别失败时，降级走后端已有识别能力（复用 gozxing，多尺度重试）
+        if (!uuid) {
+          const dataUrl = await new Promise<string>((resolve) => {
+            const r = new FileReader()
+            r.onload = (e) => resolve((e.target?.result as string) || '')
+            r.onerror = () => resolve('')
+            r.readAsDataURL(picked)
+          })
+          if (dataUrl) {
+            try {
+              const res = await authApi.decodeQr(dataUrl)
+              uuid = res.data.data.uuid || ''
+            } catch {
+              // 忽略，走统一失败提示
+            }
+          }
+        }
+        if (!uuid) {
+          message.error('未识别到二维码，请换一张更清晰的二维码图片')
+          return
+        }
+        items[index].content = uuid
+        message.success('二维码已解析')
+      } finally {
+        uploadingImage.value = false
+      }
+      return
     }
-    reader.readAsDataURL(file)
 
+    // ---- 其它图片（签到照片等）：先压缩到 ≤300KB，再上传 OBS ----
+    let file = picked
     uploadingImage.value = true
+    uploadingLabel.value = '压缩中...'
     try {
+      try {
+        file = await compressImage(picked, 300 * 1024)
+      } catch {
+        file = picked
+      }
+
+      // 本地预览（仅界面展示，上传成功后会覆盖为 OBS 正式 URL）
+      const reader = new FileReader()
+      reader.onload = (e) => {
+        items[index].content = (e.target?.result as string) || ''
+      }
+      reader.readAsDataURL(file)
+
+      uploadingLabel.value = '上传中...'
       // Step 1: 从服务器获取 OBS 上传策略（仅获取凭证，不传文件）
       const policyRes = await fetch('/api/task/upload-policy', {
         method: 'POST',
@@ -1291,9 +1420,10 @@ function getGPSLocation(source: string) {
               <!-- 上传中：loading 动画 -->
               <div
                 v-if="uploadingImage"
-                class="w-24 h-24 flex items-center justify-center border-2 border-dashed border-gray-300 rounded-lg text-blue-500"
+                class="w-24 h-24 flex flex-col items-center justify-center gap-1 border-2 border-dashed border-gray-300 rounded-lg text-blue-500"
               >
                 <LoaderCircle class="w-6 h-6 animate-spin" />
+                <span class="text-[10px]">{{ uploadingLabel }}</span>
               </div>
               <!-- 已有图片：显示缩略图，点击替换 -->
               <img
@@ -1483,9 +1613,10 @@ function getGPSLocation(source: string) {
               <!-- 上传中：loading 动画 -->
               <div
                 v-if="uploadingImage"
-                class="w-24 h-24 flex items-center justify-center border-2 border-dashed border-gray-300 rounded-lg text-blue-500"
+                class="w-24 h-24 flex flex-col items-center justify-center gap-1 border-2 border-dashed border-gray-300 rounded-lg text-blue-500"
               >
                 <LoaderCircle class="w-6 h-6 animate-spin" />
+                <span class="text-[10px]">{{ uploadingLabel }}</span>
               </div>
               <img
                 v-else-if="item.content && (item.content.startsWith('http') || item.content.startsWith('data:image'))"
diff --git a/frondend/src/views/leave/LeaveView.vue b/frondend/src/views/leave/LeaveView.vue
index f65acec..ea0d83d 100644
--- a/frondend/src/views/leave/LeaveView.vue
+++ b/frondend/src/views/leave/LeaveView.vue
@@ -628,7 +628,7 @@ import type { LeaveItem, LeaveReportPlace, LeaveType } from '@/api/leave'
 import { useMessage } from '@/composables/useMessage'
 import AppDialog from '@/components/ui/dialog/AppDialog.vue'
 
-const { message } = useMessage()
+const message = useMessage()
 const router = useRouter()
 
 /** 跳转工单页面（无法请/销假时提交工单反馈） */