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ViewerJs (module for Omeka S)

New versions of this module and support for Omeka S version 3.0 and above are available on GitLab, which seems to respect users and privacy better.

Viewer Js is a module for Omeka S that allows to display common document formats (pdf, standard office ones), via a light viewer.

. Supported formats are:

  • Portable document format (pdf)
  • OpenDocument Text (odt, fodt)
  • OpenDocument Spreadsheet (ods, fods)
  • OpenDocument Presentation (odp, fodp)

Common multimedia formats can be managed too, if they are displayable by the browser. They are not enabled by default, because they are natively managed by Omeka S.

  • Images (jpg, png, gif)
  • Audio/video (via html5)

Concretely, it includes the ViewerJS library, that integrates the pdf library of Mozilla pdf.js and the standard office formats via WebODF. The images and the audio/video are displayed via the browser itself.

Note: for office documents, the bigger they are, the bigger should be the computer of the visitor to display them.


The module uses an external library, ViewerJS, so use the release zip to install it, or use and init the source.

  • From the zip

Download the last release from the list of releases (the master does not contain the dependency), and uncompress it in the modules directory.

  • From the source and for development:

If the module was installed from the source, rename the name of the folder of the module to ViewerJs, and go to the root module, and run:

npm install
  • Note about WebODF

Because the standards of the Document Foundation are "simple" and easy to manage, the library WebODF is mainly a stylesheet. And because this is a true standard, it is sustainable, stable and available to anyone. So it’s recommended for any office work.


All resources of Omeka S that are in pdf, odt, fodt, ods, fods, odp, fodp, and txt are automatically displayed by the ViewerJs, so you have nothing to do.

Options can be set differently for the admin board or each site. Only one option is available directly: the styles of the iframe. Other ones are managed via the rendered.

To display the media (images, audio, video) via the ViewerJS, copy and adapt the section ['file_renderers']['aliases'] in config/module.config.php in your config/local.config.php.

To display the pdf with the more complete viewer provided by the module Pdf Viewer, you need to set its value in your local config too:

            'application/pdf' => 'pdfViewer',
            'pdf' => 'pdfViewer',

Advanced display in public theme

Because the viewer is integrated as a renderer and not a helper, it is possible to display it anywhere via the media. In particular, you can use the standard block "Media" to display it in any page. So just render the media, with possible options, that are passed directly to the template:

echo $media->render($options);

A block layout is available too if needed for external urls. Furthermore, a view helper is available to render any url anywhere:

$options = ['source' => ''];
echo $this->viewerJs(null, $options);


Use it at your own risk.

It’s always recommended to backup your files and your databases and to check your archives regularly so you can roll back if needed.


See online issues on the module issues page on GitLab.


This module is published under the CeCILL v2.1 license, compatible with GNU/GPL and approved by FSF and OSI.

This software is governed by the CeCILL license under French law and abiding by the rules of distribution of free software. You can use, modify and/ or redistribute the software under the terms of the CeCILL license as circulated by CEA, CNRS and INRIA at the following URL "".

As a counterpart to the access to the source code and rights to copy, modify and redistribute granted by the license, users are provided only with a limited warranty and the software’s author, the holder of the economic rights, and the successive licensors have only limited liability.

In this respect, the user’s attention is drawn to the risks associated with loading, using, modifying and/or developing or reproducing the software by the user in light of its specific status of free software, that may mean that it is complicated to manipulate, and that also therefore means that it is reserved for developers and experienced professionals having in-depth computer knowledge. Users are therefore encouraged to load and test the software’s suitability as regards their requirements in conditions enabling the security of their systems and/or data to be ensured and, more generally, to use and operate it in the same conditions as regards security.

The fact that you are presently reading this means that you have had knowledge of the CeCILL license and that you accept its terms.

The ViewerJS library is published under the GNU AGPL license. The WebODF library is published under the GNU AGPL license. The pdf.js library is published under the Apache license.


ViewerJS and WebODF libraries:

  • Copyright KO GmbH, 2013-2017

Javascript library pdf.js:

  • Copyright Mozilla, 2011-2017

Module Viewer Js for Omeka S:

  • Copyright Daniel Berthereau, 2017-2020 (see Daniel-KM)


Omeka S module that display standard document formats (pdf and office: pdf, odt, ods, odp and many more) in a light unified player.





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