怎么用密码保护PDF文档

这篇文章将教你如何用密码锁定PDF文件,如果没有正确的密码将无法打开它。网络上有很多种免费的在线加密服务,你也可以使用付费专业版“Adobe Acrobat”程序来加密文档。

方法 1 的 3:

使用“SmallPDF”

  1. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/9\/9d\/Password-Protect-a-PDF-Step-1-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-1-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/9\/9d\/Password-Protect-a-PDF-Step-1-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-1-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 1 打开“SmallPDF”的保护页面。在网络浏览器中前往 https://smallpdf.com/protect-pdf/ 网站。SmallPDF网站允许你加密PDF文件,没有密码将无法打开它。
    • 如果你想要使用密码锁定PDF的编辑选项,请尝试使用PDF2Go。
  2. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/d\/dd\/Password-Protect-a-PDF-Step-2-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-2-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/d\/dd\/Password-Protect-a-PDF-Step-2-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-2-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 2 点击选择文件这个链接位于页面中央的红色方框里。点击它,打开一个窗口。
  3. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/2\/2b\/Password-Protect-a-PDF-Step-3-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-3-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/2\/2b\/Password-Protect-a-PDF-Step-3-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-3-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 3 选择PDF文件。前往PDF所在路径,找到你想要加密的PDF文件,点击它。
  4. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/d\/d8\/Password-Protect-a-PDF-Step-4-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-4-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/d\/d8\/Password-Protect-a-PDF-Step-4-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-4-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 4 点击打开它位于窗口右下角。接着会将文件上传到SmallPDF网站。
  5. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/e\/ef\/Password-Protect-a-PDF-Step-5-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-5-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/e\/ef\/Password-Protect-a-PDF-Step-5-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-5-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 5 输入密码。在“选择你的密码”文本栏里输入你想要使用的密码,然后在下方的“重复你的密码”一栏再次输入密码。
    • 两次输入的密码需要完全一致,才能进入下一步。
  6. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/4\/4a\/Password-Protect-a-PDF-Step-6-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-6-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/4\/4a\/Password-Protect-a-PDF-Step-6-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-6-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 6 点击加密 PDF →按钮。这个红色按钮位于密码输入栏的下方。点击它,将密码应用到PDF文件。
  7. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/3\/30\/Password-Protect-a-PDF-Step-7-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-7-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/3\/30\/Password-Protect-a-PDF-Step-7-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-7-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 7 点击立即下载文件加密文件后,这个按钮会出现在页面左侧。点击它,将加密的文件下载到电脑上。此后,如果你想要打开这个文件,就需要输入设置的密码。
方法 2 的 3:

使用PDF2Go

  1. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/c\/cd\/Password-Protect-a-PDF-Step-8-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-8-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/c\/cd\/Password-Protect-a-PDF-Step-8-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-8-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 1 打开PDF2Go网站。在网络浏览器中前往 https://www.pdf2go.com/protect-pdf/ 网站。像SmallPDF网站一样,“PDF2Go”允许你加密PDF,同时它还允许你锁定文件的编辑功能。这意味着如果别人没有这两个密码,就无法编辑和更改PDF文件。
  2. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/f\/f8\/Password-Protect-a-PDF-Step-9-Version-6.jpg\/v4-460px-Password-Protect-a-PDF-Step-9-Version-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/f\/f8\/Password-Protect-a-PDF-Step-9-Version-6.jpg\/v4-728px-Password-Protect-a-PDF-Step-9-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 2 点击选择文件它位于页面顶部,接着打开一个窗口。
  3. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/f\/fb\/Password-Protect-a-PDF-Step-10-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-10-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/f\/fb\/Password-Protect-a-PDF-Step-10-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-10-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 3 选择你的PDF文件。前往你想要加密的PDF文件,点击它来选中它。
  4. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/3\/38\/Password-Protect-a-PDF-Step-11-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-11-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/3\/38\/Password-Protect-a-PDF-Step-11-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-11-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 4 点击打开它位于窗口右下角,接着会提示将PDF上传到网站。
  5. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/d\/df\/Password-Protect-a-PDF-Step-12-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-12-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/d\/df\/Password-Protect-a-PDF-Step-12-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-12-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 5 滚动到“设置”部分。这个部分位于页面的中央,你可以在这里设置密码。
  6. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/c\/ca\/Password-Protect-a-PDF-Step-13-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-13-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/c\/ca\/Password-Protect-a-PDF-Step-13-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-13-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 6 输入密码。在“输入用户密码”栏内输入密码,然后在下方的“重复用户密码”一栏再次输入密码。这会将密码设置为打开PDF的密码。
  7. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/a\/a4\/Password-Protect-a-PDF-Step-14-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-14-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/a\/a4\/Password-Protect-a-PDF-Step-14-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-14-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 7 禁用PDF全选。点击“允许打印?”、“允许复制?”和“允许修改?”标题下方的不允许气泡。
  8. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/e\/ef\/Password-Protect-a-PDF-Step-15-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-15-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/e\/ef\/Password-Protect-a-PDF-Step-15-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-15-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 8 滚动页面,输入编辑密码。在“输入所有者的密码”和“重复所有者的密码”文本栏里输入密码,用来锁定文件。这两个输入框位于页面底部。
  9. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/d\/d6\/Password-Protect-a-PDF-Step-16-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-16-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/d\/d6\/Password-Protect-a-PDF-Step-16-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-16-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 9 点击保存更改它是一个绿色的按钮,位于页面底部。点击它,网站会开始将密码应用到PDF文件。
  10. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/e\/e2\/Password-Protect-a-PDF-Step-17-Version-5.jpg\/v4-460px-Password-Protect-a-PDF-Step-17-Version-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/e\/e2\/Password-Protect-a-PDF-Step-17-Version-5.jpg\/v4-728px-Password-Protect-a-PDF-Step-17-Version-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 10 点击下载文件这个浅绿色的按钮位于页面右上角。将密码保护的PDF文件下载到电脑上。当你想要打开或编辑PDF文件,你需要输入正确的密码。
    • 如果想要下载压缩格式的PDF文件,你也可以点击页面中央的下载ZIP文件按钮。这适合下载大的PDF文件。
方法 3 的 3:

使用专业版“Adobe Acrobat”程序

  1. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/6\/66\/Password-Protect-a-PDF-Step-18-Version-4.jpg\/v4-460px-Password-Protect-a-PDF-Step-18-Version-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/6\/66\/Password-Protect-a-PDF-Step-18-Version-4.jpg\/v4-728px-Password-Protect-a-PDF-Step-18-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 1 确保你有付费版“Adobe Acrobat”程序。如果你使用免费版的“Adobe”阅读器,你将无法编辑PDF文件(包括添加密码)。
  2. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/a\/ac\/Password-Protect-a-PDF-Step-19-Version-4.jpg\/v4-460px-Password-Protect-a-PDF-Step-19-Version-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/a\/ac\/Password-Protect-a-PDF-Step-19-Version-4.jpg\/v4-728px-Password-Protect-a-PDF-Step-19-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 2 在阅读器中打开PDF文件。点击左上角的文件按钮,点击下拉菜单里的打开...按钮,选择PDF文件,点击窗口右下角的打开按钮。
  3. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/b\/be\/Password-Protect-a-PDF-Step-20-Version-4.jpg\/v4-460px-Password-Protect-a-PDF-Step-20-Version-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/b\/be\/Password-Protect-a-PDF-Step-20-Version-4.jpg\/v4-728px-Password-Protect-a-PDF-Step-20-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 3 点击浏览这个菜单选项位于阅读器窗口的顶部(Windows电脑)或屏幕顶部(Mac电脑)。接着出现一个下拉菜单。
  4. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/2\/2e\/Password-Protect-a-PDF-Step-21-Version-4.jpg\/v4-460px-Password-Protect-a-PDF-Step-21-Version-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/2\/2e\/Password-Protect-a-PDF-Step-21-Version-4.jpg\/v4-728px-Password-Protect-a-PDF-Step-21-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 4 选择工具它位于下拉菜单里,接着出现带有更多选项的弹出菜单。
  5. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/a\/a5\/Password-Protect-a-PDF-Step-22-Version-4.jpg\/v4-460px-Password-Protect-a-PDF-Step-22-Version-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/a\/a5\/Password-Protect-a-PDF-Step-22-Version-4.jpg\/v4-728px-Password-Protect-a-PDF-Step-22-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 5 选择保护它位于弹出菜单中,点击它,弹出新菜单。
  6. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/e\/e0\/Password-Protect-a-PDF-Step-23-Version-4.jpg\/v4-460px-Password-Protect-a-PDF-Step-23-Version-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/e\/e0\/Password-Protect-a-PDF-Step-23-Version-4.jpg\/v4-728px-Password-Protect-a-PDF-Step-23-Version-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 6 点击打开它位于最后的弹出菜单里,这会打开“保护”工具窗口。
  7. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/e\/e2\/Password-Protect-a-PDF-Step-24.jpg\/v4-460px-Password-Protect-a-PDF-Step-24.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/e\/e2\/Password-Protect-a-PDF-Step-24.jpg\/v4-728px-Password-Protect-a-PDF-Step-24.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 7 点击加密它位于窗口的中央。[1]
  8. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/a\/a0\/Password-Protect-a-PDF-Step-25.jpg\/v4-460px-Password-Protect-a-PDF-Step-25.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/a\/a0\/Password-Protect-a-PDF-Step-25.jpg\/v4-728px-Password-Protect-a-PDF-Step-25.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 8 点击使用密码加密文件这会打开加密选项页面。
  9. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/2\/22\/Password-Protect-a-PDF-Step-26.jpg\/v4-460px-Password-Protect-a-PDF-Step-26.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/2\/22\/Password-Protect-a-PDF-Step-26.jpg\/v4-728px-Password-Protect-a-PDF-Step-26.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 9 勾选“获取密码打开这个文档”对话框。它位于“打开文档”标题的下方。密码栏会变成可输入的状态。
  10. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/c\/c8\/Password-Protect-a-PDF-Step-27.jpg\/v4-460px-Password-Protect-a-PDF-Step-27.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/c\/c8\/Password-Protect-a-PDF-Step-27.jpg\/v4-728px-Password-Protect-a-PDF-Step-27.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 10 输入密码。在“文档打开密码”文本栏输入密码。
  11. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/e\/e3\/Password-Protect-a-PDF-Step-28.jpg\/v4-460px-Password-Protect-a-PDF-Step-28.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/e\/e3\/Password-Protect-a-PDF-Step-28.jpg\/v4-728px-Password-Protect-a-PDF-Step-28.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 11 选择兼容性水平。点击“兼容性”下拉框,然后点击最低版本的兼容性选项。
  12. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/9\/97\/Password-Protect-a-PDF-Step-29.jpg\/v4-460px-Password-Protect-a-PDF-Step-29.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/9\/97\/Password-Protect-a-PDF-Step-29.jpg\/v4-728px-Password-Protect-a-PDF-Step-29.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 12 勾选“加密所有文档内容”对话框。它位于“选项”部分中,这可以阻止他人从PDF文件中提取信息。
  13. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/c\/c9\/Password-Protect-a-PDF-Step-30.jpg\/v4-460px-Password-Protect-a-PDF-Step-30.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/c\/c9\/Password-Protect-a-PDF-Step-30.jpg\/v4-728px-Password-Protect-a-PDF-Step-30.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 13 点击确定按钮。它位于页面底部。
  14. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/6\/65\/Password-Protect-a-PDF-Step-31.jpg\/v4-460px-Password-Protect-a-PDF-Step-31.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/6\/65\/Password-Protect-a-PDF-Step-31.jpg\/v4-728px-Password-Protect-a-PDF-Step-31.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 14 弹出提示时,再次输入密码。输入密码,点击确定,确认更改,并将密码应用到PDF文件。当你想要再次浏览文件时,必须输入密码。

小提示

  • 在为PDF文件设置密码时,请使用邮箱或电脑密码相同的规则,设置复杂而安全的密码。这可以保护你的PDF文件密码不被他人猜到或窃取。

警告

  • 使用特定的软件有可能打开锁定的PDF文件。就算已经加密了文件,也要把它存储在安全私密的地方。

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