The Wikimedia Commons logo, optimized and valid SVG version with a white transparent background.
SVG version was created by  <a href="//commons.wikimedia.org/wiki/User_talk:Grunt" title="User talk:Grunt">Grunt</a>, cleaned up by <a href="//commons.wikimedia.org/wiki/User:3247" class="mw-redirect" title="User:3247">3247</a> and optimized by <a href="//commons.wikimedia.org/wiki/User:Fleshgrinder" title="User:Fleshgrinder">User:Fleshgrinder</a>, based on the earlier PNG version, created by <a href="https://meta.wikimedia.org/wiki/User:Reidab" class="extiw" title="m:User:Reidab">Reidab</a>. White background added by <a href="//commons.wikimedia.org/wiki/User:Dudemanfellabra" title="User:Dudemanfellabra">User:Dudemanfellabra</a>
<a href="//commons.wikimedia.org/wiki/File:Commons-logo.svg" title="File:Commons-logo.svg">File:Commons-logo.svg</a>