(Redirected from Extension:Media Viewer)
This extension comes with MediaWiki 1.31 and above. Thus you do not have to download it again. However, you still need to follow the other instructions provided.
MediaWiki extensions manual
Release status: stable
Implementation User interface, Ajax
Description Provides a better experience to users when they click on thumbnails in a page
Compatibility policy Snapshots releases along with MediaWiki. Master is not backward compatible.
MediaWiki 1.25+
PHP 5.4+
License GNU General Public License 2.0 or later
Example MediaWiki.org
  • $wgMediaViewerUseThumbnailGuessing
  • $wgMediaViewerRecordVirtualViewBeaconURI
  • $wgMediaViewerImageQueryParameter
  • $wgMediaViewerEnableByDefault
  • $wgMediaViewerEnableByDefaultForAnonymous
  • $wgMediaViewerExtensions
Quarterly downloads 152 (Ranked 40th)
Public wikis using 1,926 (Ranked 195th)
Translate the MultimediaViewer extension if it is available at translatewiki.net
Issues Open tasks · Report a bug

The MultimediaViewer extension gives wiki users a different interface for viewing full-size or nearly full-size images in their browser without extraneous page loads or confusing interstitial pages.



You will also likely want to download Extension:CommonsMetadata . It is not a hard requirement, but without it, you will not get much information in the boxes showing details about the images.

On third-party wikis, even if you only use locally uploaded images, you need CommonsMetatada to populate the information in the boxes via a template holding information about the files.)

  • Download and move the extracted MultimediaViewer folder to your extensions/ directory.
    Developers and code contributors should install the extension from Git instead, using:cd extensions/
    git clone https://gerrit.wikimedia.org/r/mediawiki/extensions/MultimediaViewer
  • Add the following code at the bottom of your LocalSettings.php file:
    wfLoadExtension( 'MultimediaViewer' );
  • Configure as required
  •   Done – Navigate to Special:Version on your wiki to verify that the extension is successfully installed.

Vagrant installation:

  • If using Vagrant , install with vagrant roles enable multimediaviewer --provision


  • $wgMediaViewerEnableByDefault and $wgMediaViewerEnableByDefaultForAnonymous will determine whether MMV is enabled by default for everyone and anonymous users, respectively. They both default to true.
  • $wgMediaViewerUseThumbnailGuessing will improve performance when enabled, but can be fragile depending on how the wiki is set up (it will probably work fine if you use a 404 handler).
Forced download

To ensure files are offered for download and not viewed in the user's browser following a click on the Download … button, the server has to be configured, except when using vagrant:

If the requested URL to an image directory contains the download query parameter, the Content-Disposition-header must be set to attachment. This can be achieved in Apache and compatible servers using mod_rewrite and mod_headers in a .htaccess file. Varnish configuration can look like this.

Usage testing


Next, go to a page that has a thumbnail on it. Try clicking on the image or on the "expand" icon near it. The lightbox should pop up and give you a bigger view of the image.

If you'd prefer, there's an exported test environment that you can use via "Special:Import" to set up a suitable testing environment quickly.



MultimediaViewer and UploadWizard need several templates to show data of photos. Just save this code in an XML file and import it in your wiki.

See also