PDF files are becoming more and more popular, usually work often needs to modify the PDF. . The general user computer is basically installed Adobe Reader, the software can only read PDF files, can not modify the PDF file, of course, can also add a little comment function. If you need to modify the PDF we need to install Adobe Acrobat. . Now that Adobe Acrobat has reached 9.0, it is good to modify the PDF document. . However, because the software is too large, downloading and installing is not convenient. Simultaneously. After installing the software, you will find that it is much slower when Adobe Reader opens PDF documents. . Of course, there are also benefits, such as OFFICE and other documents, you find that you have added a plug-in, you can directly convert the OFFICE document into a PDF file. PDF file modification method 1: First download and install Adobe Acrobat (download address, your own Baidu) Note: Adobe Acrobat software, generally need to be activated, pay attention to see if there are any plug-ins installed when installing the software. For example, Baidu Toolbar or something. . Disadvantages: Adobe Acrobat does not have permission to modify some encrypted PDF documents. . . For the decryption of encrypted PDF documents: 1), you can download a PDF decryption tool, but the tool is a tool after all. Sometimes it can't decrypt some complicated passwords. At the same time, sometimes the defunct PDF file will become garbled. 2) When installing Adobe Acrobat software, it is generally installed "Adobe PDF" printer, which is a good thing, you can print the encrypted PDF to Adobe PDF and PDF documents as PDF files. . After saving, you will find that the encryption of the PDF document is gone. For a small number of PDF documents, there may be special fonts. After printing them as PDF files, you will find that some fields have become garbled. At this point you can use a more professional PDF printer such as PDF Factory. Use this software to convert any file that supports printing into a PDF document. At the same time, after converting the encrypted PDF document “Print & rdquo; and then converting it into a PDF document, you will find that the password is gone. At the same time, the permissions set on the PDF have not been used before. Of course, after decryption, you can use Adobe Acrobat software to edit the PDF. There is not much to say about the software here. Simply mention a few points: 1) For PDF editing, right click on the toolbar blank ---- Advanced Edit. Bring up the editing tool 2) For editing pictures, images, etc. in PDF documents. Need to set up image editing software for Adobe Acrobat. Method: menu bar ----------Preferences----Touchup---Select image editor (such as Photoshop firework Coreldrw, etc.) 3) Adobe Acrobat software provides extraction function for PDF document pages , menu bar --- document & mdash; extract the page, delete. (This can selectively extract the required pages for PDF) 4) There is a split, of course, there is a merge pull. Menu Bar ----- File-----Create a PDF package. PDF file modification method 2 Foxit PDF Editor is the first real PDF file editing software. Many people want to find an editor that edits other types of documents. In fact, there was no such tool before the Foxit PDF Editor appeared. Each PDF file contains many pages, each of which contains various visual objects such as text objects, graphic objects, and image objects. Each object is defined by its properties in the way it is displayed. Features of Foxit PDF Editor include: - Edit existing PDF files or create brand new PDF files. - Display PDF files with almost the same effect as Adobe PDF Reader. - Page zoom. - Reliable WYSIWYG editing capabilities. - Insert or delete pages. - Add text objects using embedded or non-embedded fonts. - Insert rows or other simple graphic objects. - Insert an image in bitmap format. - Remove any object from the page. - Change the properties of the object. - Can revoke any operation. - Copy and paste any object between different PDF files. - Copy and paste text between PDF and any Windows application. - Copy and paste images between PDF and any Windows application.