A strong password combines uppercase, lowercase, numbers and symbols (例如 T3mp$2025!)?

A strong password combines uppercase, lowercase, numbers and symbols (例如 T3mp$2025!).

禁用all permissions for a read-only PDF — readers won't be able to print or copy text。?

禁用all permissions for a read-only PDF — readers won't be able to print or copy text。

Store your 密码 safely: an encrypted PDF with a lost 密码 cannot be recovered.

为 PDF 添加密码保护

Encrypt 你的 PDFs with a strong password, with precise control over what readers can do.

1订阅 Starter 或更高方案，然后上传你的 PDF。
2输入一个 password and confirm it. The strength indicator guides you — aim for "Strong".
3选择the permissions granted to readers: Print, Copy text, Modify。
4Click "Protect & encrypt". The PDF is encrypted locally, 无需离开浏览器.
5下载protected PDF。

A strong password combines uppercase, lowercase, numbers and symbols (例如 T3mp$2025!).
禁用all permissions for a read-only PDF — readers won't be able to print or copy text。
Store your 密码 safely: an encrypted PDF with a lost 密码 cannot be recovered.

Available to Starter subscribers and above only. 1 file 一次.