2025 PDF LOCK懶人包，推薦清單整理

2024年7月1日 — PDF Lock Studio is a simple tool to lock a specific page or multiple pages of PDF files with a password. Which then you can to save it to a ...

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

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.

Unlock PDF. Remove PDF password security, giving you the freedom to use your PDFs as you want. Upload your file and transform it. Select PDF files.

2024年3月11日 — 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」。 選取「檔案 > 使用密碼保護」。在「進階選項」清單中，選取「 ...

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.

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

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。

按一下上方的「選取檔案」按鈕，或將PDF 拖放至放置區。 · 輸入密碼，然後再次輸入以確認密碼。 · 按一下「設定密碼」。 · 下載受密碼保護的PDF 文件，或登入以共用文件。