User blog comment:Harbumz/Introducing Vignette, Wikia's New Thumbnailer/@comment-34115-20150212010632/@comment-24880673-20150212065236

SVGs are supported in the new thumbnail. We render SVG thumbnails to PNG. See this image as an example. Wikipedia is doing something similar. If you want to thumbnail an SVG they convert it to a PNG as part of the process (example ).

Using ImageMagick (converting to PNG) is the default in MediaWiki according to the manual. From the manual page it sounds like there are several options but they all have tradeoffs.

We have found that ImageMagick is easy to use operationally (we know fairly well how to make it work without crashing servers constantly), it has good support for most image types, and tons of options. The SVG support may not be great, but we are able to thumbnail most of them (using PNG).