"I can't read my PDF files on my computer. How to do with it?" "What's wrong with my Firefox, which can't allow me to read PDF attachment?" Have you met something like that? The article will give you some tips to handle the problem. At first, i would like to introduce PDF file format: PDF (short for Portable Document Format), one of the most popular ebook formats, created by Adobe Systems in 1993. PDF files are viewable and printable on virtually any platform, including Windows, Mac OS, and mobile platforms such as Android. Click here to read more about PDF features. Let's go the section 1: Open PDF file on computer What you need to do: Download and install Adobe Reader or Foxit Reader on your PC or Mac. Free download the Adobe Reader 9 at http://get.adobe.com/br/reader/ Alternatively, you can choose online PDF conversion tool to convert PDF to HTML or TXT format. http://access.adobe.com/access/ Sometimes, you may need to read PDF attachments sent by your company or friends. Generally speaking, you can read PDF attachments on the web as long as you install PDF reader like Adobe Reader or Foxit Reader on your computer. However, if you still can't read PDF document after the installation, you would better follow the below guide to check out the possible reason and clear it up. 1: Restart your PC or Mac and reopen the PDF file. Sometimes, it can solve some common problem. 2.Try to open your local PDF file in web browser In your web browser, choose File-open File, then select your PDF from hard drive, click Open. If the PDF document can't be well displayed on the web, but it can well readable with Adobe Reader, the problem results in the web server. Contact the webmaster to find the solution. 3.Select the option Display PDF in Browser Open Adobe Reader or Acrobat, choose Edit-Preference, select Internet-tick Display PDF In Browser-click OK. 4.Install the latest version of Adobe Reader or Acrobat, or uninstall and reinstall the program. Know detailed information about How to open PDF files or attachment on the web. Sometimes, you may also wanna open PDF on your iPod Touch, iPhone or iPad, here share some tips Tip 1 View PDF e-mail attachments or PDFs from Safari with iBooks Only applicable to iPhone and iTouch with iOS 4 or later. Tip 2 Desktop applications-Stanza or Good Reader, which can support you to view PDF documents on iPhone, iPod Touch. Tip 3 Convert PDF for perfect playback on Apple products like iPad, iPhone, iTouch. Click to refer to related articles How to read PDF on iPad and transfer PDF to iPhone/iTouch, hope these guides can give you some hints.