I'm new with sharepoint 2013 Does anyone know pdf viewer webpart for sharepoint 2013 for free Please help me.
Use content editor web part:- (http://www.sharepointanalysthq.com/2011/03/embedding-pdfs-into-sharepoint-2010-pages/)
First you need to find the URL to the PDF that you wish to view, after that you are ready to go!
Add a Content Editor Web Part to the page
Click on the ‘Edit HTML Source’ button for the Content Editor Web Part (not the page)
Add the following code:
<object><embed src="FILENAME.PDF" height="850" width="850"
src = The URL of the file, remember to put in a server relative URL to this!
height = height of the rendered PDF
width = width of the rendered PDF
Click on Save and you should see your PDF rendered
Upload the PDF document to an appropriate SharePoint library and copy the URL in a Notepad. The URL is needed later.
Open the Wiki page where the document has to be embedded and click on the Edit icon at the top-left.
Click on the location or bring the cursor to the location in the Wiki page where you’d like to embed the PDF.
Click on the Editing Tools > Insert tab at the top of the page ().
Click on Web Part.
Select Media and Content in the Categories list box on the left of the page and select Page Viewer from the Web Parts list. Click on Add. This will insert the Page Viewer web part at the location of the cursor in the page.
Hover over the inserted Page Viewer web part. Click on the drop down button and click the Edit Web Part option.
Paste the URL, give a title and specify a height for the web part and click OK. You are done! The PDF will now appear as a document in a window and Adobe Reader’s normal features like zoom, pan, print etc. would be available to interact with the document.
You can use a CQWP (Custom Query Web Part) and create your own ItemStyle.xsl. Then simply add the CQWP to your site and select the source library and the Content Type you wish to show.
With this solution you can have one Web Part serving N listitems in SharePoint libraries, you can also query for Content Types on the whole site if you wish to show PDF documents from multiple libraries.
You can find more information about how to create a custom ItemStyle on the MSDN (http://msdn.microsoft.com/en-us/library/office/bb447557(v=office.14).aspx), and there are also a few tutorials out there (like this one http://www.cwheeler76.com/Lists/Posts/Post.aspx?List=9a19060b-0efe-4368-8360-b07d23dc5c7b&ID=6&Web=916c3f13-7f62-4b71-b302-6fd9106b4bb2).
If you want to iterate multiple PDF's from multiple site collections and have a search service running you can use a simmilar Web Part - SCRWP (Search Core Results Web Part) to iterate all documents from index.
On a side note, i wouldn't add to mutch <embed> tags to a site - this can have a big performance impact on the browser - maybe you'll find a solution with thumbnails.