How to password protect PDF free online with Adobe Acrobat

1. Open the PDF and choose Tools > Protect > Encrypt > Encrypt with Password. 2. If you receive a prompt, click Yes to change the security.

Open the PDF in Acrobat. From the global bar in the upper left, select All tools > Protect a PDF > Protect with password.

PDFEncrypt is a free, open-source native Windows app that allows you to password protect (encrypt) PDF files for free, without purchasing expensive software ...

評分 4.2 (13,462) A simple and secure web app to encrypt your PDF files with strong AES 128-bit encryption for free. Add password security to your PDF files in 5 easy steps.

評分 4.7 (8,747) 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.

Encrypt and protect PDF with a password to safeguard sensitive information. Secure your PDF files online, with ease and without registration.

PDF文檔加密. 用密碼給PDF文檔加密， 以確保敏感數據的機密性。 上傳你的文檔，並轉換它。 選擇一個PDF文檔. 從電腦中上傳. 或者把PDF文檔拖動到這裡. PDF 加密.

To encrypt a file from the main toolbox screen, click the Protect PDF button. Select the file or drag it onto the screen, create a password, and ...

評分 4.7 (15,307) · 免費 · 商業/生產力 Protect your PDF files online by adding a password that will prevent people from being able to copy or print your PDF document. Secure PDF files for free.

No registration or watermarks. Simple and secure way to password protect your PDFs with strong AES 256 bits encryption.