很多时候，您可能已经观察到某些PDF文档带有密码安全性和其他附加限制，不允许您打开、复制或打印其内容。这会带来很大的不便，尤其是当您想要访问文档中的信息或将其打印出来以供离线使用时。这篇文章展示了如何使用免费的PDF Unlocker 软件或在线工具(PDF Unlocker software or online tools)删除 PDF 密码(remove PDF password)和解锁 PDF 文件(unlock PDF files)。
如何从 PDF 中删除密码
可移植文档格式(Document Format)( PDF ) 是唯一广泛用于各种办公(Office)活动以及专业交流(Professional Communication)的文档格式。虽然很多时候，我们可能想要从PDF文件中复制某些文本或图像或整个页面，然后粘贴或在其他地方使用它，可能是在我们的Word 文档(Word Document)、记事本(Notepad)中或打印它，但对PDF文档垫的限制会阻止我们从这样做。PDF文档可能被锁定。
PDF文档的创建者和所有者会锁定他们的文档内容，以免被其他人复制。出于安全原因，这是PDF中可用的选项之一，用于锁定内容以进行复制保护。(PDF)或者有时，某些PDF文档会阻止用户复制、粘贴或打印其内容，这可能是因为PDF可能使用了尝试阅读它的系统中不可用的字体。
删除 PDF(Remove PDF)密码和解锁 PDF(Unlock PDF)文件
但是有一些好消息——您可以删除密码限制。但在开始之前，你需要知道一件事。有两种密码。即使您想查看PDF（用户密码(User Passwords)）也需要您输入密码，另一种是仅在您想编辑PDF时才需要输入（所有者密码(Owner Passwords)）。
PDF Cracker 在线工具
1] 如果您正在寻找一个在线应用程序，可以轻松地让您一键解锁和访问这些锁定的PDF文件，那么您可能会发现 CrackMyPDF非常有用。它是一款免费的在线PDF解锁器，只需点击几下即可解锁 PDF文件并消除编辑、复制、打印和提取的限制。(nlocks PDF)
用户需要做的只是从他的电脑上传一个文件，然后点击“解锁”(‘Unlock’)。您的文档的解锁版本会自动在新的浏览器窗口中打开。然后，您可以将其保存到您的计算机。通过使用这个免费的在线应用程序(this free online application)，您可以在几秒钟内删除密码和限制。
特征：(Features:)
- 在线解锁 PDF 文件
- 完全免费！无需注册
- 删除PDF对复制、编辑、打印和提取的限制
- 无需安装软件，一切在线完成
- 支持所有版本的Adobe Acrobat
- 解锁带有复制/粘贴和打印限制的PDF文档(PDF)
这里需要提一下，虽然PDF Restrictions Remover能够删除标准密码保护PDF文件中的限制，包括 40 位RC4加密、128 位RC4解密和 128 位AES解密，但它不能,
- 自动删除(Remove)或查找用户/打开密码
- 删除其他保护，例如DRM或第三方插件
- 启用Acrobat Reader以 在本地 保存表单和数据、(Save)添加(Add)评论、 添加(Add)数字签名。
2]您还可以使用PDF Crack，这是另一种免费的在线工具，可立即解锁PDF的内容。您只需将PDF文档上传到他们的服务器，接受条款和条件，就会打开一个新的浏览器选项卡，显示解锁的PDF文件，没有打印或复制/粘贴限制。借助此工具，您现在可以使用所有工具，例如复制、粘贴、打印以及将图像和文本添加到现有和新文档中。点击这里(Click here)访问网站。向下滚动(Scroll)到页面末尾，您将在那里看到该工具。
Remove PDF Restrictions using free software or online tools
PDF解锁免费软件
1]免费的PDF密码(Free PDF Password Remover)删除器可让您解锁PDF文档并删除密码以及对打印、编辑、复制、填写表格等的限制。
它可以删除所有者(Owner)密码和已知用户密码。在这里(here)得到它。
2] BeCyPDFMetaEdit是另一个免费实用程序，可以帮助您从(BeCyPDFMetaEdit)PDF文件中删除密码。
3]免费 PDF Unlocker(Free PDF Unlocker)的工作原理是删除限制PDF两个区域访问的密码。一种是用于限制打印、复制和粘贴等某些功能的密码。第二个是任何可能阻止您访问或打开PDF文件的密码。
要使用Free PDF Unlocker(Free PDF Unlocker)解锁第二种限制，您必须右键单击并选择“删除 PDF 密码”并关闭应用程序。
众所周知，这在大多数情况下都有效……但有报道称这不起作用。该软件早期是免费的，但在 1.0.4 版本之后现在已经付费。
How to remove Password from PDF with Free Software or Online Tool
Many timеs you might hаve observed that some PDF documents come with password security and other added restrictions, that do not allow you to open, copy, or print its contents. This causes great inconvenience, especially when you want to access information from the document or print it out for offline use. This post shows how to remove PDF password and unlock PDF files using free PDF Unlocker software or online tools.
How to Remove Password from PDF
Portable Document Format (PDF) is the only widely used document format for all kinds of activities in Office as well in Professional Communication. While many a time, we might want to copy certain text or images or a complete page from the PDF file and paste or use it somewhere else, maybe in our Word Document, Notepad or to print it, restrictions placed on the PDF document mat prevent us from doing so. The PDF document may be locked.
PDF document creators and owners lock their document content in order to get rid of being copied by someone else. This is one of the options available in PDF for security reasons to lock content for copy-protect. Or sometimes, some PDF documents prevent the user from copying, pasting or printing it’s contents may be because the PDF might have used a font that is not available in the system trying to read it.
Remove PDF password & Unlock PDF files
But there is some good news – you can remove the password restrictions. But before you begin, you need to know one thing. There are two kinds of passwords. One that requires you to enter a password even if you want to view the PDF (User Passwords), and the other that you need to enter only if you want to edit the PDF (Owner Passwords).
PDF Cracker Online Tools
1] If you are looking for an online application that could easily allow you to unlock and access these locked PDF files with one click then you may find CrackMyPDF very useful. It is a free online PDF unlocker that unlocks PDF files and removes the restriction for editing, copying, printing, and extracting with just a few clicks.
All a user needs to do is just upload a document from his computer and click ‘Unlock’. The unlocked version of your document automatically gets opened in a new browser window. You can then save it to your computer. By using this free online application, you can remove the password and restrictions in just a few seconds.
Features:
- Unlocks PDF Files online
- Absolutely free! Requires no registration
- Removes PDF restrictions for copying, editing, printing and extracting
- Requires no software installation, everything is done online
- Supports all versions of Adobe Acrobat
- Unlocks PDF documents that come with copy/paste and print restrictions
It is important to mention here that though the PDF Restrictions Remover is capable to remove the restrictions in a standard password-protected PDF file, including 40-bit RC4 encryption, 128-bit RC4 decryption, and 128-bit AES decryption, it does not,
- Remove or find the user/open password automatically
- Remove other protections, such as DRM or third party plug-in
- Enable Acrobat Reader to – Save forms and data locally, Add comments, Add digital signatures.
2] You can also use PDF Crack, another free online tool available to unlock the content of PDF in no time. You will just have to upload the PDF document into their server, accept the terms and conditions and a new browser tab will open with the displaying the unlocked PDF file, without printing or copying/pasting restrictions. With this tool, now you will be able to use all tools like copying, pasting, printing, and adding images as well as text to existing and new documents. Click here to visit the website. Scroll down towards the end of the page and you will see the tool there.
Remove PDF Restrictions using free software or online tools
PDF Unlocker free software
1] Free PDF Password Remover lets you unlock PDF documents and remove passwords as well as restrictions on printing, editing, copying, form filling, etc.
It can remove Owner passwords and known user passwords. Get it here.
2] BeCyPDFMetaEdit is another free utility that can help you remove passwords from PDF files.
3] Free PDF Unlocker works by removing passwords that restrict access in two areas of the PDF. One is for passwords that restrict some functions such as printing copying and pasting. The second is any password that might prevent you from accessing or opening a PDF file.
To unlock the second kind of restriction with Free PDF Unlocker, you have to right-click and select “Remove PDF Password” and close the application.
This is known to work most of the time … but there have been reports of this not working. This software was earlier free but has gone paid now after version 1.0.4.
