加密PDF
為PDF文件新增密碼保護。新增加密並設置權限。
上傳 PDF 文件
關於此工具
加密PDF為您的PDF文檔新增密碼保護和加密。設置使用者密碼以防止打開,設置所有者密碼以控制列印和複製等權限。
根據不同的安全需求選擇不同的加密級別(128位或256位AES)。
所有加密都在您的瀏覽器中進行,確保您的密碼和文檔保持隱私。
Practical guidance before you use 加密PDF
Best for real document workflows
Best for adding password protection before sending private forms, draft agreements, statements, or internal files. 機密文檔 is a common example: 保護敏感的商業文檔。
Privacy and file handling
EasyPDFNex prioritizes local processing in your browser. That means supported PDF operations run on your device, not in a public cloud queue. For sensitive files, review the output before sharing it, close the browser tab after downloading, and avoid processing documents you are not authorized to edit.
Quality checks after processing
After you 加密並下載, open the result and check page order, text readability, signatures, links, and form fields. If the source file is scanned, encrypted, very large, or damaged, try a related workflow such as decrypt pdf, change permissions, sanitize pdf before repeating the task.
Choose a strong password and decide how the recipient will receive it separately from the PDF. For 加密PDF, the first step is usually "上傳PDF文件": 拖放您的PDF文件或點擊選擇。 Test the protected file in a separate viewer before sharing so you know the password and permissions behave as expected.
Editorial review note
This guidance is maintained by the EasyPDFNex editorial team and reviewed for practical PDF workflow accuracy. Tool pages are written to explain when a feature is useful, what to check before download, and where browser-based processing has limits.
使用方法
上傳PDF文件
拖放您的PDF文件或點擊選擇。
設置密碼
輸入使用者密碼和/或所有者密碼。配置權限。
加密並下載
點擊加密保護您的PDF並下載。
使用場景
機密文檔
保護敏感的商業文檔。
個人文件
保護個人文檔如稅務申報表。
受控分發
限制收件人對文檔的操作。
常見問題
使用者密碼和所有者密碼有什麼區別?
使用者密碼防止打開;所有者密碼控制權限。
使用什麼加密?
提供128位或256位AES加密選項。
可以只設置權限而不設置使用者密碼嗎?
是的,您可以只設置所有者密碼來控制權限。