Add PDF password protection to your file to protect sensitive content. When you encrypt a PDF, only people with the password can view the file content.

Discover how to encrypt a PDF file to keep sensitive information secure via email. Our guide provides easy steps and helpful tips for protecting PDFs.

Dec 5, 2025 · Select All tools > Protect a PDF. In the left pane, select Protect with password. In the dialog box that opens, select if you want to set the password for Viewing or Editing. Advanced …

Dec 5, 2025 · Learn how to use certificates to encrypt PDF documents in Adobe Acrobat, ensuring only intended recipients can view the contents.

If you’re working with sensitive information, you have to protect it. Learn how to easily encrypt with password and apply permissions to PDF files to prevent copying, changing, or printing your PDFs.

Add PDF password protection with the Adobe Acrobat online tool for free. By adding a password to your PDF file, you can limit access and only allow people with the password to view the file content.

若要將文件解密，經授權的用戶需要一組金鑰，這通常是密碼或數位認證。 當您使用 Acrobat 線上工具為 PDF 檔案加上密碼保護時，此工具會將檔案加密以提供額外的保護。 如果您需要更進階的 PDF 安全 …

Use the free online PDF password protection tool from Adobe Acrobat to keep your files secure. Simply click ‘ Add a Password ’ to encrypt your PDF and restrict access to only those you authorize.

How to unlock a PDF to remove password security: Open the PDF in Acrobat. Use the “Unlock” tool: Choose “Tools” > “Protect” > “Encrypt” > “Remove Security.”

Apr 4, 2025 · Looking to add a password to your PDF or control who can print, copy, or edit your content? These resources will walk you through how to secure your PDF files with permissions and …