diff --git a/app/pages/me/admin/media-storage.vue b/app/pages/me/admin/media-storage.vue
index 773d396..5da2269 100644
--- a/app/pages/me/admin/media-storage.vue
+++ b/app/pages/me/admin/media-storage.vue
@@ -37,7 +37,7 @@ function formatRefSources(refs: RefDetail[]): string {
 }
 
 const { user, refresh } = useAuthSession()
-const { fetchData } = useClientApi()
+const { fetchData, getApiErrorMessage } = useClientApi()
 const toast = useToast()
 
 const loading = ref(false)
@@ -45,6 +45,10 @@ const cleaning = ref(false)
 const report = ref<AuditReport | null>(null)
 const cleanupOpen = ref(false)
 
+const reuploadInput = ref<HTMLInputElement | null>(null)
+const reuploadTargetId = ref<number | null>(null)
+const reuploadingId = ref<number | null>(null)
+
 async function ensureAdmin() {
   await refresh(true)
   if (user.value?.role !== 'admin') {
@@ -52,16 +56,50 @@ async function ensureAdmin() {
   }
 }
 
-async function runAudit() {
+async function runAudit(showToast = true) {
   loading.value = true
   try {
-    report.value = await fetchData<AuditReport>('/api/admin/media/storage-audit')
-    toast.add({ title: '校验完成', color: 'success' })
+    report.value = await fetchData<AuditReport>('/api/admin/media/storage-audit', { notify: false })
+    if (showToast) {
+      toast.add({ title: '校验完成', color: 'success' })
+    }
   } finally {
     loading.value = false
   }
 }
 
+function openReuploadPicker(assetId: number) {
+  reuploadTargetId.value = assetId
+  nextTick(() => reuploadInput.value?.click())
+}
+
+async function onReuploadFile(ev: Event) {
+  const assetId = reuploadTargetId.value
+  reuploadTargetId.value = null
+  const input = ev.target as HTMLInputElement
+  const file = input.files?.[0]
+  input.value = ''
+  if (!assetId || !file) {
+    return
+  }
+  reuploadingId.value = assetId
+  try {
+    const form = new FormData()
+    form.append('file', file)
+    await fetchData<{ url: string; sizeBytes: number }>(`/api/admin/media/assets/${assetId}/reupload`, {
+      method: 'POST',
+      body: form,
+      notify: false,
+    })
+    toast.add({ title: '已重新写入磁盘', color: 'success' })
+    await runAudit(false)
+  } catch (e: unknown) {
+    toast.add({ title: getApiErrorMessage(e), color: 'error' })
+  } finally {
+    reuploadingId.value = null
+  }
+}
+
 async function runCleanup() {
   cleaning.value = true
   try {
@@ -103,6 +141,13 @@ onMounted(async () => {
 
 <template>
   <UContainer class="py-8 space-y-6 w-full max-w-[min(100%,88rem)] px-4 sm:px-6">
+    <input
+      ref="reuploadInput"
+      type="file"
+      class="sr-only"
+      accept="image/png,image/jpeg,image/jpg,image/webp"
+      @change="onReuploadFile"
+    >
     <div class="flex flex-wrap justify-between items-start gap-3">
       <div>
         <h1 class="text-2xl font-semibold">
@@ -112,6 +157,7 @@ onMounted(async () => {
           比对 <code class="text-xs">public/assets</code> 与表 <code class="text-xs">media_assets</code>：
           库中有记录但文件缺失、非法 storageKey、以及磁盘上未登记的文件。
           「一键清理」仅删除<strong>无 media_refs 引用</strong>且<strong>磁盘上确实没有文件</strong>的库记录，不会删磁盘文件。
+          对有引用但缺文件的记录可使用<strong>重新上传</strong>按原 <code class="text-xs">storage_key</code> 写回 WebP，不破坏文章/资料中的链接。
         </p>
       </div>
       <UButton to="/me" variant="ghost" size="sm">
@@ -167,6 +213,9 @@ onMounted(async () => {
                 <th class="p-2 min-w-[12rem]">
                   引用来源（owner_type）
                 </th>
+                <th class="p-2 w-28 whitespace-nowrap">
+                  操作
+                </th>
               </tr>
             </thead>
             <tbody>
@@ -186,6 +235,17 @@ onMounted(async () => {
                 <td class="p-2 text-xs align-top">
                   {{ formatRefSources(row.refs) }}
                 </td>
+                <td class="p-2 align-top">
+                  <UButton
+                    size="xs"
+                    variant="soft"
+                    :loading="reuploadingId === row.id"
+                    :disabled="loading || reuploadingId !== null"
+                    @click="openReuploadPicker(row.id)"
+                  >
+                    重新上传
+                  </UButton>
+                </td>
               </tr>
             </tbody>
           </table>
@@ -216,6 +276,9 @@ onMounted(async () => {
                 <th class="p-2 min-w-[12rem]">
                   引用来源（owner_type）
                 </th>
+                <th class="p-2 w-28 whitespace-nowrap">
+                  操作
+                </th>
               </tr>
             </thead>
             <tbody>
@@ -236,6 +299,17 @@ onMounted(async () => {
                   <span v-if="row.refCount === 0" class="text-muted">—</span>
                   <span v-else>{{ formatRefSources(row.refs) }}</span>
                 </td>
+                <td class="p-2 align-top">
+                  <UButton
+                    size="xs"
+                    variant="soft"
+                    :loading="reuploadingId === row.id"
+                    :disabled="loading || reuploadingId !== null"
+                    @click="openReuploadPicker(row.id)"
+                  >
+                    重新上传
+                  </UButton>
+                </td>
               </tr>
             </tbody>
           </table>
diff --git a/app/pages/me/media/index.vue b/app/pages/me/media/index.vue
index 326f7a6..8389b29 100644
--- a/app/pages/me/media/index.vue
+++ b/app/pages/me/media/index.vue
@@ -38,6 +38,12 @@ const total = ref(0)
 const loading = ref(true)
 const uploading = ref(false)
 const fileInput = ref<HTMLInputElement | null>(null)
+const reuploadInput = ref<HTMLInputElement | null>(null)
+const reuploadTargetId = ref<number | null>(null)
+const reuploadingId = ref<number | null>(null)
+/** 预览加载失败（多为磁盘缺文件） */
+const previewFailedIds = ref<Set<number>>(new Set())
+const imgBust = ref<Record<number, number>>({})
 
 const pageSizeItems = [
   { label: '每页 10', value: 10 },
@@ -76,6 +82,8 @@ async function load() {
     )
     items.value = body.items
     total.value = body.total
+    const ids = new Set(body.items.map((i) => i.id))
+    previewFailedIds.value = new Set([...previewFailedIds.value].filter((id) => ids.has(id)))
   } catch (e: unknown) {
     toast.add({ title: getApiErrorMessage(e), color: 'error' })
   } finally {
@@ -144,6 +152,49 @@ async function copyUrl(item: MediaAssetRow) {
   }
 }
 
+function imageSrc(item: MediaAssetRow): string {
+  const b = imgBust.value[item.id]
+  return b ? `${item.publicPath}?v=${b}` : item.publicPath
+}
+
+function onImgError(id: number) {
+  previewFailedIds.value = new Set([...previewFailedIds.value, id])
+}
+
+function openReuploadPicker(assetId: number) {
+  reuploadTargetId.value = assetId
+  nextTick(() => reuploadInput.value?.click())
+}
+
+async function onReuploadFile(ev: Event) {
+  const assetId = reuploadTargetId.value
+  reuploadTargetId.value = null
+  const input = ev.target as HTMLInputElement
+  const file = input.files?.[0]
+  input.value = ''
+  if (!assetId || !file) {
+    return
+  }
+  reuploadingId.value = assetId
+  try {
+    const form = new FormData()
+    form.append('file', file)
+    await fetchData<{ url: string; sizeBytes: number }>(`/api/me/media/assets/${assetId}/reupload`, {
+      method: 'POST',
+      body: form,
+      notify: false,
+    })
+    previewFailedIds.value = new Set([...previewFailedIds.value].filter((id) => id !== assetId))
+    imgBust.value = { ...imgBust.value, [assetId]: Date.now() }
+    toast.add({ title: '已重新写入磁盘', color: 'success' })
+    await load()
+  } catch (e: unknown) {
+    toast.add({ title: getApiErrorMessage(e), color: 'error' })
+  } finally {
+    reuploadingId.value = null
+  }
+}
+
 async function copyMarkdown(item: MediaAssetRow) {
   if (!import.meta.client) {
     return
@@ -161,6 +212,13 @@ async function copyMarkdown(item: MediaAssetRow) {
 
 <template>
   <div class="space-y-6 w-full max-w-[min(100%,88rem)] px-0 sm:px-0">
+    <input
+      ref="reuploadInput"
+      type="file"
+      class="sr-only"
+      accept="image/png,image/jpeg,image/jpg,image/webp"
+      @change="onReuploadFile"
+    >
     <div>
       <h2 class="text-lg font-medium">
         资源库
@@ -203,12 +261,32 @@ async function copyMarkdown(item: MediaAssetRow) {
     <div v-else class="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
       <UCard v-for="item in items" :key="item.id">
         <div class="space-y-3">
-          <img
-            :src="item.publicPath"
-            :alt="item.storageKey"
-            class="w-full aspect-video object-cover rounded-md border border-default"
-            loading="lazy"
-          >
+          <div class="relative w-full aspect-video rounded-md border border-default overflow-hidden bg-elevated/30">
+            <img
+              :src="imageSrc(item)"
+              :alt="item.storageKey"
+              class="w-full h-full object-cover"
+              loading="lazy"
+              @error="onImgError(item.id)"
+            />
+            <div
+              v-if="previewFailedIds.has(item.id)"
+              class="absolute inset-0 flex flex-col items-center justify-center gap-2 bg-default/80 p-2"
+            >
+              <p class="text-xs text-muted text-center">
+                文件缺失或无法加载
+              </p>
+              <UButton
+                size="xs"
+                color="primary"
+                :loading="reuploadingId === item.id"
+                :disabled="reuploadingId !== null && reuploadingId !== item.id"
+                @click="openReuploadPicker(item.id)"
+              >
+                重新上传
+              </UButton>
+            </div>
+          </div>
           <div
             class="truncate font-mono text-xs text-default"
             :title="item.storageKey"
diff --git a/server/api/admin/media/assets/[id]/reupload.post.ts b/server/api/admin/media/assets/[id]/reupload.post.ts
new file mode 100644
index 0000000..b8d841a
--- /dev/null
+++ b/server/api/admin/media/assets/[id]/reupload.post.ts
@@ -0,0 +1,87 @@
+import multer from "multer";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { callNodeListener, getRequestIP } from "h3";
+import { POST_MEDIA_PUBLIC_PREFIX } from "#server/constants/media";
+import { replaceMediaAssetFileFromTempUpload } from "#server/service/media";
+import { requireAdmin } from "#server/utils/admin-guard";
+import { R } from "#server/utils/response";
+import { assertUnderRateLimit } from "#server/utils/simple-rate-limit";
+
+type MulterUploadedFile = {
+  originalname: string;
+  filename: string;
+  path: string;
+  mimetype: string;
+  size: number;
+};
+
+export default defineWrappedResponseHandler(async (event) => {
+  const admin = await requireAdmin(event);
+  const ip = getRequestIP(event, { xForwardedFor: true }) ?? "unknown";
+  assertUnderRateLimit(`admin-media-asset-reupload:${ip}`, 40, 60_000);
+
+  const idRaw = getRouterParam(event, "id");
+  const assetId = Number(idRaw);
+  if (!Number.isInteger(assetId) || assetId < 1) {
+    throw createError({ statusCode: 400, statusMessage: "无效的资源 id" });
+  }
+
+  const upload = multer({
+    storage: multer.diskStorage({
+      destination: (_req, _file, cb) => {
+        cb(null, os.tmpdir());
+      },
+      filename: (_req, file, cb) => {
+        const ext = path.extname(file.originalname).toLowerCase();
+        const baseName = path.basename(file.originalname, ext).replace(/[^a-z0-9]/gi, "-");
+        cb(null, `reupload-${Date.now()}-${Math.round(Math.random() * 1e9)}-${baseName}${ext}`);
+      },
+    }),
+    limits: { fileSize: 10 * 1024 * 1024 },
+    fileFilter: (_req, file, cb) => {
+      const allowed = ["image/png", "image/jpeg", "image/jpg", "image/webp"];
+      if (allowed.includes(file.mimetype)) {
+        cb(null, true);
+      } else {
+        cb(new Error("只支持 PNG/JPG/WebP 格式图片"));
+      }
+    },
+  });
+
+  await callNodeListener(
+    // @ts-expect-error multer 中间件类型
+    upload.single("file"),
+    event.node.req,
+    event.node.res,
+  );
+
+  // @ts-expect-error multer 挂载 file
+  const file = event.node.req.file as MulterUploadedFile | undefined;
+  if (!file?.path) {
+    throw createError({ statusCode: 400, statusMessage: "请选择要上传的图片" });
+  }
+
+  try {
+    const result = await replaceMediaAssetFileFromTempUpload({
+      assetId,
+      actorUserId: admin.id,
+      actorIsAdmin: true,
+      tempInputPath: file.path,
+    });
+    return R.success({
+      url: `${POST_MEDIA_PUBLIC_PREFIX}${result.storageKey}`,
+      sizeBytes: result.sizeBytes,
+    });
+  } catch (err) {
+    if (file.path && fs.existsSync(file.path)) {
+      try {
+        fs.unlinkSync(file.path);
+      } catch {
+        /* ignore */
+      }
+    }
+    throw err;
+  }
+});
diff --git a/server/api/me/media/assets/[id]/reupload.post.ts b/server/api/me/media/assets/[id]/reupload.post.ts
new file mode 100644
index 0000000..1a3e6e7
--- /dev/null
+++ b/server/api/me/media/assets/[id]/reupload.post.ts
@@ -0,0 +1,83 @@
+import multer from "multer";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { callNodeListener } from "h3";
+import { POST_MEDIA_PUBLIC_PREFIX } from "#server/constants/media";
+import { replaceMediaAssetFileFromTempUpload } from "#server/service/media";
+import { R } from "#server/utils/response";
+
+type MulterUploadedFile = {
+  originalname: string;
+  filename: string;
+  path: string;
+  mimetype: string;
+  size: number;
+};
+
+export default defineWrappedResponseHandler(async (event) => {
+  const user = await event.context.auth.requireUser();
+  const idRaw = getRouterParam(event, "id");
+  const assetId = Number(idRaw);
+  if (!Number.isInteger(assetId) || assetId < 1) {
+    throw createError({ statusCode: 400, statusMessage: "无效的资源 id" });
+  }
+
+  const upload = multer({
+    storage: multer.diskStorage({
+      destination: (_req, _file, cb) => {
+        cb(null, os.tmpdir());
+      },
+      filename: (_req, file, cb) => {
+        const ext = path.extname(file.originalname).toLowerCase();
+        const baseName = path.basename(file.originalname, ext).replace(/[^a-z0-9]/gi, "-");
+        cb(null, `reupload-${Date.now()}-${Math.round(Math.random() * 1e9)}-${baseName}${ext}`);
+      },
+    }),
+    limits: { fileSize: 10 * 1024 * 1024 },
+    fileFilter: (_req, file, cb) => {
+      const allowed = ["image/png", "image/jpeg", "image/jpg", "image/webp"];
+      if (allowed.includes(file.mimetype)) {
+        cb(null, true);
+      } else {
+        cb(new Error("只支持 PNG/JPG/WebP 格式图片"));
+      }
+    },
+  });
+
+  await callNodeListener(
+    // @ts-expect-error multer 中间件类型
+    upload.single("file"),
+    event.node.req,
+    event.node.res,
+  );
+
+  // @ts-expect-error multer 挂载 file
+  const file = event.node.req.file as MulterUploadedFile | undefined;
+  if (!file?.path) {
+    throw createError({ statusCode: 400, statusMessage: "请选择要上传的图片" });
+  }
+
+  try {
+    const result = await replaceMediaAssetFileFromTempUpload({
+      assetId,
+      actorUserId: user.id,
+      actorIsAdmin: false,
+      tempInputPath: file.path,
+    });
+    return R.success({
+      url: `${POST_MEDIA_PUBLIC_PREFIX}${result.storageKey}`,
+      sizeBytes: result.sizeBytes,
+    });
+  } catch (err) {
+    if (file.path && fs.existsSync(file.path)) {
+      try {
+        fs.unlinkSync(file.path);
+      } catch {
+        /* ignore */
+      }
+    }
+    throw err;
+  }
+});
+
diff --git a/server/service/media/index.ts b/server/service/media/index.ts
index c84c618..dc9a9d3 100644
--- a/server/service/media/index.ts
+++ b/server/service/media/index.ts
@@ -1,11 +1,14 @@
 import fs from "node:fs";
 import path from "node:path";
+import sharp from "sharp";
 import { dbGlobal } from "drizzle-pkg/lib/db";
 import { mediaAssets, mediaRefs } from "drizzle-pkg/lib/schema/content";
 import { and, count, desc, eq, inArray, isNotNull, isNull, lte, not, notExists, or, sql } from "drizzle-orm";
 import {
+  MEDIA_IMAGE_MAX_WIDTH_PX,
   MEDIA_ORPHAN_GRACE_HOURS_AFTER_DEREF,
   MEDIA_ORPHAN_GRACE_HOURS_NEVER_REF,
+  MEDIA_WEBP_QUALITY,
   POST_MEDIA_PUBLIC_PREFIX,
   RELATIVE_ASSETS_DIR,
 } from "#server/constants/media";
@@ -144,6 +147,83 @@ export async function insertMediaAssetRow(params: {
   return id;
 }
 
+/**
+ * 将临时上传的栅格图转 WebP 并写入该资产既有 `storageKey` 路径，更新 `sizeBytes` / `mime`。
+ * 用于「库有记录但磁盘缺文件」或用户主动替换文件；不改变 `id` 与 `storageKey`，引用仍有效。
+ */
+export async function replaceMediaAssetFileFromTempUpload(params: {
+  assetId: number;
+  actorUserId: number;
+  actorIsAdmin: boolean;
+  tempInputPath: string;
+}): Promise<{ storageKey: string; sizeBytes: number }> {
+  const [row] = await dbGlobal.select().from(mediaAssets).where(eq(mediaAssets.id, params.assetId)).limit(1);
+  if (!row) {
+    throw createError({ statusCode: 404, statusMessage: "媒体不存在" });
+  }
+  if (!params.actorIsAdmin && row.userId !== params.actorUserId) {
+    throw createError({ statusCode: 403, statusMessage: "无权操作该媒体" });
+  }
+  const key = row.storageKey;
+  if (!key || key !== path.basename(key) || key.includes("..")) {
+    throw createError({ statusCode: 400, statusMessage: "非法 storage_key，无法覆盖写入" });
+  }
+  const base = assetsBaseDir();
+  const destPath = path.resolve(base, key);
+  if (!isPathUnderAssetsDir(destPath)) {
+    throw createError({ statusCode: 400, statusMessage: "非法存储路径" });
+  }
+  if (!fs.existsSync(base)) {
+    fs.mkdirSync(base, { recursive: true });
+  }
+
+  try {
+    await sharp(params.tempInputPath)
+      .rotate()
+      .resize({
+        width: MEDIA_IMAGE_MAX_WIDTH_PX,
+        height: MEDIA_IMAGE_MAX_WIDTH_PX,
+        fit: "inside",
+        withoutEnlargement: true,
+      })
+      .webp({ quality: MEDIA_WEBP_QUALITY })
+      .toFile(destPath);
+  } catch (procErr) {
+    if (fs.existsSync(destPath)) {
+      try {
+        fs.unlinkSync(destPath);
+      } catch {
+        /* ignore */
+      }
+    }
+    const msg = procErr instanceof Error ? procErr.message : "图片处理失败";
+    throw createError({ statusCode: 400, statusMessage: msg });
+  } finally {
+    if (params.tempInputPath !== destPath) {
+      try {
+        if (fs.existsSync(params.tempInputPath)) {
+          fs.unlinkSync(params.tempInputPath);
+        }
+      } catch {
+        /* ignore */
+      }
+    }
+  }
+
+  const stat = fs.statSync(destPath);
+  await dbGlobal
+    .update(mediaAssets)
+    .set({
+      sizeBytes: stat.size,
+      mime: "image/webp",
+      sha256: null,
+      variantsJson: null,
+    })
+    .where(eq(mediaAssets.id, params.assetId));
+
+  return { storageKey: key, sizeBytes: stat.size };
+}
+
 export async function reconcileAssetTimestampsAfterRefChange(assetIds: number[]): Promise<void> {
   const unique = [...new Set(assetIds)];
   for (const id of unique) {