Below we show how to encrypt a PDF file with a password and how to apply PDF restrictions.

1. 上传您的文件

   文件通过加密连接安全上传. 文件保持安全. 处理后，它们将被永久删除.

   不想上传您的文件并离线处理它们？
   Try Sejda Desktop. 与在线服务功能相同，且文件永远不会离开您的计算机.

   点击“上传”并从您的本地计算机选择文件.

   将文件拖放到页面上也有效.

   Dropbox 或 Google Drive 文件

   您也可以从 Dropbox 或 Google Drive 中选取 PDF 文件.

   展开“上传”下拉菜单并选择您的文件.

2. Choose a strong password

   When opening the document, users will be asked to provide this password. Make sure it's a strong password, recommended 16 characters or more.

   Optionally, choose an owner password as well

   This is the password that users will be asked when attempting to make changes to the document, after the document is already opened.

3. Select optional PDF restrictions

   Choose what PDF features should be allowed. For example printing can be restricted, or filling forms and commenting can be disabled

   Depending on the software used for opening the PDF file, these permissions may or may not be enforced.

4. Save your changes

   Click Encrypt PDF and then Download your protected PDF.