添加密码保护以确保PDF安全。
点击或拖放PDF文件到此处
仅支持PDF · 最大50MB
Set a password and pdfs.to applies AES-256 encryption with qpdf so only people with the password can open the file.
Use a strong password and store it somewhere safe — there's no way to recover the file if you forget it. To remove a password from a PDF you already know the password to, use Unlock PDF.