protectpdf

2024年2月22日 — 進階密碼保護. 在Acrobat 中開啟PDF，然後執行以下任一操作：. 前往「全部工具 > 保護PDF」。從左側窗格中的「保護PDF」工具組，選取「使用密碼加密」。

支援： PDF, 圖片, Word, Excel, PowerPoint等等。 ... 免費網上PDF加密服務- 以AES 128-bit高階加密標準為你的PDF檔案加密。無檔案大小限制，無廣告水印，而且安全易用。

Free online tool to password protect PDF files and to set PDF security settings. No quality loss. Without installation. Without registration.

透過值得信賴的加密技術，在線上以密碼保護PDF。免費試用Adobe Acrobat 線上服務以密碼保護PDF 安全！

How to Password Protect Digitally Signed PDF Documents. 1. Open the PDF and choose File > Print > Adobe PDF > Print. 2. Type the file name, and click Save.

Lock PDF using Windows, Mac, iOS, or Android. FreePDFConvert is online software, so all main platforms are supported. Locking PDF has never been easier and more ...

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

Password protect PDF files with this free and secure password tool. Encrypt a PDF with a password to ensure that sensitive content is kept private.

設置一個密碼來保護PDF文檔中的敏感資訊。輕鬆地線上保護你的PDF文檔，且無需註冊。

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.