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Created in the 1993 by Adobe Systems for the purpose of platform independent document exchange. Pdf files are independent of the computer's operating system, software and hardware. This makes it different from other file or document formats, for example, a Microsoft Word document; which would require Microsoft Office to be installed on the computer, in order to view the document. PDF files are one of the ingenious ways to send your important documents and files using secured transmission. If you have large volumes of files to be transmitted, you would further like to shrink the file size of PDF files. It is also hard to attach big size PDF files and email it to your friends or clients as transmission time will be huge. It is better to compress it and send. Here are some of the best ways that are useful for reducing your PDF files:

1. Use the Save Command:
When you are trying to save the PDF files, use the Save as Command, so that Acrobat rewrites the entire PDF document as entirely as possible. If you choose the option as save the changes are appended to the file, which means the file size is increased. By default, Acrobat Save As command is also optimized for web page viewing and allows to be downloaded on a page-by-page basis from a network or a web server, thereby reducing the time taken for downloading and allowing better accessibility and viewing performance.

2.Minimize fonts:
Fonts take up a lot of space and if possible do not embed fonts but always try to keep your fonts to the minimum readable size.

3 Free PDF Compressor (version 1.12) [Windows]
This program is now shareware but the link provided leads to the last freeware version. It is pretty much just an executable that does a decent job at reducing PDF file sizes. this program managed to reduce a 50MB PDF file to 45MB, with the maximum compression level, at an impressive speed (almost instant conversion).

When you use a pdf files, you must always met this problem, that is, you do not know how to edit a pdf file, it is not hard if you convert, as to how to convert pdf to dwg, you can use a free pdf to dwg converter for help, after converting, you can edit your pdf files easily. What’s more, you can turn the dwg giles back to pdf files with the help of dwg to pdf converter.