Help:Images

Uploaded files
To use an image or other file which has been uploaded to the wiki, use: If you add a pipe (|) and some text after the filename, the text will be used as alternative text for text-only browsers:

If you don't want to display the image, you can link to the file's description page, by adding a colon: To bypass the description page and link directly to a file, use the "Media" pseudo-namespace: You can also make piped links if you want some other text to be used:

Advanced options
The full syntax for displaying an image is: Where options can be zero or more of the following, separated by pipes: The options can be given in any order. If a given option does not match any of the other possibilities, it is assumed to be the caption text. Caption text can contain wiki links or other formatting.
 * ,, or  : Controls how the image is formatted
 * ,,  ,  : Controls the alignment of the image on the page
 * : Resizes the image to the given width in pixels

Gallery of images
It's easy to make a gallery of thumbnails with the  tag. The syntax is:

Other files
You can link to an external file using the same syntax used for linking to an external web page. This feature has to be enabled by the admin; in the new releases of MediaWiki it's disabled due to security reasons. Or with different text:

If it is enabled on your wiki, you can also embed external images. To do that, simply insert the url:

Administration of images/files
See here: Manual:Image Administration