diff --git a/src/features/authFiles/hooks/useAuthFilesData.ts b/src/features/authFiles/hooks/useAuthFilesData.ts
index 0a9cc73..ccf441a 100644
--- a/src/features/authFiles/hooks/useAuthFilesData.ts
+++ b/src/features/authFiles/hooks/useAuthFilesData.ts
@@ -117,6 +117,33 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
     setSelectedFiles(new Set());
   }, []);
 
+  const applyDeletedFiles = useCallback((names: string[]) => {
+    const deletedNames = Array.from(
+      new Set(
+        names
+          .map((name) => name.trim())
+          .filter(Boolean)
+      )
+    );
+    if (deletedNames.length === 0) return;
+
+    const deletedSet = new Set(deletedNames);
+    setFiles((prev) => prev.filter((file) => !deletedSet.has(file.name)));
+    setSelectedFiles((prev) => {
+      if (prev.size === 0) return prev;
+      let changed = false;
+      const next = new Set<string>();
+      prev.forEach((name) => {
+        if (deletedSet.has(name)) {
+          changed = true;
+        } else {
+          next.add(name);
+        }
+      });
+      return changed ? next : prev;
+    });
+  }, []);
+
   useEffect(() => {
     if (selectedFiles.size === 0) return;
     const existingNames = new Set(files.map((file) => file.name));
@@ -190,36 +217,33 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
       }
 
       setUploading(true);
-      let successCount = 0;
-      const failed: { name: string; message: string }[] = [];
+      try {
+        const result = await authFilesApi.uploadFiles(validFiles);
+        const successCount = result.uploaded;
 
-      for (const file of validFiles) {
-        try {
-          await authFilesApi.upload(file);
-          successCount++;
-        } catch (err: unknown) {
-          const errorMessage = err instanceof Error ? err.message : 'Unknown error';
-          failed.push({ name: file.name, message: errorMessage });
+        if (successCount > 0) {
+          const suffix = validFiles.length > 1 ? ` (${successCount}/${validFiles.length})` : '';
+          showNotification(
+            `${t('auth_files.upload_success')}${suffix}`,
+            result.failed.length ? 'warning' : 'success'
+          );
+          await loadFiles();
+          await refreshKeyStats();
         }
-      }
 
-      if (successCount > 0) {
-        const suffix = validFiles.length > 1 ? ` (${successCount}/${validFiles.length})` : '';
-        showNotification(
-          `${t('auth_files.upload_success')}${suffix}`,
-          failed.length ? 'warning' : 'success'
-        );
-        await loadFiles();
-        await refreshKeyStats();
+        if (result.failed.length > 0) {
+          const details = result.failed
+            .map((item) => `${item.name}: ${item.error}`)
+            .join('; ');
+          showNotification(`${t('notification.upload_failed')}: ${details}`, 'error');
+        }
+      } catch (err: unknown) {
+        const errorMessage = err instanceof Error ? err.message : 'Unknown error';
+        showNotification(`${t('notification.upload_failed')}: ${errorMessage}`, 'error');
+      } finally {
+        setUploading(false);
+        event.target.value = '';
       }
-
-      if (failed.length > 0) {
-        const details = failed.map((item) => `${item.name}: ${item.message}`).join('; ');
-        showNotification(`${t('notification.upload_failed')}: ${details}`, 'error');
-      }
-
-      setUploading(false);
-      event.target.value = '';
     },
     [loadFiles, refreshKeyStats, showNotification, t]
   );
@@ -234,15 +258,9 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
         onConfirm: async () => {
           setDeleting(name);
           try {
-            await authFilesApi.deleteFile(name);
+            const result = await authFilesApi.deleteFile(name);
             showNotification(t('auth_files.delete_success'), 'success');
-            setFiles((prev) => prev.filter((item) => item.name !== name));
-            setSelectedFiles((prev) => {
-              if (!prev.has(name)) return prev;
-              const next = new Set(prev);
-              next.delete(name);
-              return next;
-            });
+            applyDeletedFiles(result.files.length > 0 ? result.files : [name]);
           } catch (err: unknown) {
             const errorMessage = err instanceof Error ? err.message : '';
             showNotification(`${t('notification.delete_failed')}: ${errorMessage}`, 'error');
@@ -252,7 +270,7 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
         },
       });
     },
-    [showConfirmation, showNotification, t]
+    [applyDeletedFiles, showConfirmation, showNotification, t]
   );
 
   const handleDeleteAll = useCallback(
@@ -301,35 +319,13 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
                 return;
               }
 
-              let success = 0;
-              let failed = 0;
-              const deletedNames: string[] = [];
+              const result = await authFilesApi.deleteFiles(
+                filesToDelete.map((file) => file.name)
+              );
+              const success = result.deleted;
+              const failed = result.failed.length;
 
-              for (const file of filesToDelete) {
-                try {
-                  await authFilesApi.deleteFile(file.name);
-                  success++;
-                  deletedNames.push(file.name);
-                } catch {
-                  failed++;
-                }
-              }
-
-              setFiles((prev) => prev.filter((f) => !deletedNames.includes(f.name)));
-              setSelectedFiles((prev) => {
-                if (prev.size === 0) return prev;
-                const deletedSet = new Set(deletedNames);
-                let changed = false;
-                const next = new Set<string>();
-                prev.forEach((name) => {
-                  if (deletedSet.has(name)) {
-                    changed = true;
-                  } else {
-                    next.add(name);
-                  }
-                });
-                return changed ? next : prev;
-              });
+              applyDeletedFiles(result.files);
 
               if (failed === 0 && isProblemOnly) {
                 showNotification(
@@ -380,7 +376,7 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
         },
       });
     },
-    [deselectAll, files, showConfirmation, showNotification, t]
+    [applyDeletedFiles, deselectAll, files, showConfirmation, showNotification, t]
   );
 
   const handleDownload = useCallback(
@@ -579,59 +575,33 @@ export function useAuthFilesData(options: UseAuthFilesDataOptions): UseAuthFiles
         variant: 'danger',
         confirmText: t('common.confirm'),
         onConfirm: async () => {
-          const results = await Promise.allSettled(
-            uniqueNames.map((name) => authFilesApi.deleteFile(name))
-          );
+          try {
+            const result = await authFilesApi.deleteFiles(uniqueNames);
+            applyDeletedFiles(result.files);
 
-          const deleted: string[] = [];
-          let failCount = 0;
-          results.forEach((result, index) => {
-            if (result.status === 'fulfilled') {
-              deleted.push(uniqueNames[index]);
+            if (result.failed.length === 0) {
+              showNotification(
+                `${t('auth_files.delete_all_success')} (${result.deleted})`,
+                'success'
+              );
             } else {
-              failCount++;
+              showNotification(
+                t('auth_files.delete_filtered_partial', {
+                  success: result.deleted,
+                  failed: result.failed.length,
+                  type: t('auth_files.filter_all'),
+                }),
+                'warning'
+              );
             }
-          });
-
-          if (deleted.length > 0) {
-            const deletedSet = new Set(deleted);
-            setFiles((prev) => prev.filter((file) => !deletedSet.has(file.name)));
-          }
-
-          setSelectedFiles((prev) => {
-            if (prev.size === 0) return prev;
-            const deletedSet = new Set(deleted);
-            let changed = false;
-            const next = new Set<string>();
-            prev.forEach((name) => {
-              if (deletedSet.has(name)) {
-                changed = true;
-              } else {
-                next.add(name);
-              }
-            });
-            return changed ? next : prev;
-          });
-
-          if (failCount === 0) {
-            showNotification(
-              `${t('auth_files.delete_all_success')} (${deleted.length})`,
-              'success'
-            );
-          } else {
-            showNotification(
-              t('auth_files.delete_filtered_partial', {
-                success: deleted.length,
-                failed: failCount,
-                type: t('auth_files.filter_all'),
-              }),
-              'warning'
-            );
+          } catch (err: unknown) {
+            const errorMessage = err instanceof Error ? err.message : '';
+            showNotification(`${t('notification.delete_failed')}: ${errorMessage}`, 'error');
           }
         },
       });
     },
-    [showConfirmation, showNotification, t]
+    [applyDeletedFiles, showConfirmation, showNotification, t]
   );
 
   return {
diff --git a/src/services/api/authFiles.ts b/src/services/api/authFiles.ts
index 82cb350..5cce3d0 100644
--- a/src/services/api/authFiles.ts
+++ b/src/services/api/authFiles.ts
@@ -9,6 +9,31 @@ import type { OAuthModelAliasEntry } from '@/types';
 type StatusError = { status?: number };
 type AuthFileStatusResponse = { status: string; disabled: boolean };
 type AuthFileEntry = AuthFilesResponse['files'][number];
+type AuthFileBatchFailure = { name: string; error: string };
+type AuthFileBatchUploadResponse = {
+  status?: string;
+  uploaded?: number;
+  files?: unknown;
+  failed?: unknown;
+};
+type AuthFileBatchDeleteResponse = {
+  status?: string;
+  deleted?: number;
+  files?: unknown;
+  failed?: unknown;
+};
+type AuthFileBatchUploadResult = {
+  status: string;
+  uploaded: number;
+  files: string[];
+  failed: AuthFileBatchFailure[];
+};
+type AuthFileBatchDeleteResult = {
+  status: string;
+  deleted: number;
+  files: string[];
+  failed: AuthFileBatchFailure[];
+};
 
 export const AUTH_FILE_INVALID_JSON_OBJECT_ERROR = 'AUTH_FILE_INVALID_JSON_OBJECT';
 
@@ -18,6 +43,129 @@ const getStatusCode = (err: unknown): number | undefined => {
   return undefined;
 };
 
+const normalizeRequestedAuthFileNames = (names: string[]): string[] => {
+  const seen = new Set<string>();
+  const normalized: string[] = [];
+
+  names.forEach((name) => {
+    const trimmed = String(name ?? '').trim();
+    if (!trimmed || seen.has(trimmed)) return;
+    seen.add(trimmed);
+    normalized.push(trimmed);
+  });
+
+  return normalized;
+};
+
+const normalizeBatchFileNames = (value: unknown): string[] => {
+  if (!Array.isArray(value)) return [];
+  return normalizeRequestedAuthFileNames(value.map((item) => String(item ?? '')));
+};
+
+const normalizeBatchFailures = (value: unknown): AuthFileBatchFailure[] => {
+  if (!Array.isArray(value)) return [];
+
+  return value.reduce<AuthFileBatchFailure[]>((result, item) => {
+    if (!item || typeof item !== 'object') return result;
+    const entry = item as Record<string, unknown>;
+    const name = String(entry.name ?? '').trim();
+    const error =
+      typeof entry.error === 'string'
+        ? entry.error.trim()
+        : typeof entry.message === 'string'
+          ? entry.message.trim()
+          : '';
+
+    if (!name && !error) return result;
+    result.push({ name, error: error || 'Unknown error' });
+    return result;
+  }, []);
+};
+
+const deriveSuccessfulFileNames = (requestedNames: string[], failed: AuthFileBatchFailure[]): string[] => {
+  const failedNames = new Set(
+    failed
+      .map((entry) => entry.name.trim())
+      .filter(Boolean)
+  );
+
+  if (failedNames.size === 0) {
+    return [...requestedNames];
+  }
+
+  return requestedNames.filter((name) => !failedNames.has(name));
+};
+
+const normalizeBatchUploadResponse = (
+  payload: AuthFileBatchUploadResponse | undefined,
+  requestedNames: string[]
+): AuthFileBatchUploadResult => {
+  const failed = normalizeBatchFailures(payload?.failed);
+  const uploadedFilesFromPayload = normalizeBatchFileNames(payload?.files);
+  const uploaded =
+    typeof payload?.uploaded === 'number'
+      ? payload.uploaded
+      : uploadedFilesFromPayload.length > 0
+        ? uploadedFilesFromPayload.length
+        : requestedNames.length === 1 && failed.length === 0
+          ? 1
+          : 0;
+
+  let uploadedFiles = uploadedFilesFromPayload;
+  if (uploadedFiles.length === 0 && uploaded > 0) {
+    if (failed.length === 0 && uploaded === requestedNames.length) {
+      uploadedFiles = [...requestedNames];
+    } else {
+      const derivedNames = deriveSuccessfulFileNames(requestedNames, failed);
+      if (derivedNames.length === uploaded) {
+        uploadedFiles = derivedNames;
+      }
+    }
+  }
+
+  return {
+    status: typeof payload?.status === 'string' ? payload.status : failed.length > 0 ? 'partial' : 'ok',
+    uploaded,
+    files: uploadedFiles,
+    failed,
+  };
+};
+
+const normalizeBatchDeleteResponse = (
+  payload: AuthFileBatchDeleteResponse | undefined,
+  requestedNames: string[]
+): AuthFileBatchDeleteResult => {
+  const failed = normalizeBatchFailures(payload?.failed);
+  const deletedFilesFromPayload = normalizeBatchFileNames(payload?.files);
+  const deleted =
+    typeof payload?.deleted === 'number'
+      ? payload.deleted
+      : deletedFilesFromPayload.length > 0
+        ? deletedFilesFromPayload.length
+        : requestedNames.length === 1 && failed.length === 0
+          ? 1
+          : 0;
+
+  let deletedFiles = deletedFilesFromPayload;
+  if (deletedFiles.length === 0 && deleted > 0) {
+    if (failed.length === 0 && deleted === requestedNames.length) {
+      deletedFiles = [...requestedNames];
+    } else {
+      const derivedNames = deriveSuccessfulFileNames(requestedNames, failed);
+      if (derivedNames.length === deleted) {
+        deletedFiles = derivedNames;
+      }
+    }
+  }
+
+  return {
+    status: typeof payload?.status === 'string' ? payload.status : failed.length > 0 ? 'partial' : 'ok',
+    deleted,
+    files: deletedFiles,
+    failed,
+  };
+};
+
 const readTextField = (entry: AuthFileEntry, key: string): string => {
   const value = entry[key];
   return typeof value === 'string' ? value.trim() : '';
@@ -252,13 +400,35 @@ export const authFilesApi = {
   setStatus: (name: string, disabled: boolean) =>
     apiClient.patch<AuthFileStatusResponse>('/auth-files/status', { name, disabled }),
 
-  upload: (file: File) => {
+  uploadFiles: async (files: File[]): Promise<AuthFileBatchUploadResult> => {
+    const requestedNames = files.map((file) => file.name);
+    if (requestedNames.length === 0) {
+      return { status: 'ok', uploaded: 0, files: [], failed: [] };
+    }
+
     const formData = new FormData();
-    formData.append('file', file, file.name);
-    return apiClient.postForm('/auth-files', formData);
+    files.forEach((file) => {
+      formData.append('file', file, file.name);
+    });
+    const payload = await apiClient.postForm<AuthFileBatchUploadResponse>('/auth-files', formData);
+    return normalizeBatchUploadResponse(payload, requestedNames);
   },
 
-  deleteFile: (name: string) => apiClient.delete(`/auth-files?name=${encodeURIComponent(name)}`),
+  upload: (file: File) => authFilesApi.uploadFiles([file]),
+
+  deleteFiles: async (names: string[]): Promise<AuthFileBatchDeleteResult> => {
+    const requestedNames = normalizeRequestedAuthFileNames(names);
+    if (requestedNames.length === 0) {
+      return { status: 'ok', deleted: 0, files: [], failed: [] };
+    }
+
+    const payload = await apiClient.delete<AuthFileBatchDeleteResponse>('/auth-files', {
+      data: { names: requestedNames },
+    });
+    return normalizeBatchDeleteResponse(payload, requestedNames);
+  },
+
+  deleteFile: (name: string) => authFilesApi.deleteFiles([name]),
 
   deleteAll: () => apiClient.delete('/auth-files', { params: { all: true } }),