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'''PdfHandler''' shows uploaded pdf files in a multipage preview layout.
With the [https://www.mediawiki.org/wiki/Extension:ProofreadPage Proofread Page extension] enabled, pdfs can be displayed side-by-side with text for transcribing books and other documents, as is commonly done with DjVu files (particularly in [https://en.wikisource.org/wiki/ Wikisource]).
* The main usage of the PdfHandler extension is without user interaction. If you upload a new pdf file, the metadata will be stored in the database, and then this file can be shown in a multipage preview layout like the djvu handler does. Without this extension, pdfs will not display properly when uploaded.
* Additionally, this extension allows [https://www.mediawiki.org/wiki/Extension:ProofreadPage Extension:ProofreadPage] to handle pdfs in side-by-side view for transcribing/proofreading, as is done on [https://en.wikisource.org/wiki/ Wikisource]
* Another option, introduced quite long ago ([http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/PdfHandler/PdfHandler_body.php?revision=25575&view=markup r25575]), is to use it to display PDF files as an image, showing a single page at a time.
* Because PdfHandler extends ImageHandler, you can use all the arguments that you would for an [https://www.mediawiki.org/wiki/Help:Image Image] -- for example: thumb, right/left, caption, border, link, etc.
For more information please visit [https://www.mediawiki.org/wiki/Extension:PdfHandler MediaWiki].