Tumblr supports a vast array of multimedia file types, including both static and animated GIFs. Post a GIF on your Tumblr blog by creating a new Photo post.
Log in to your Tumblr blog and select Photo from the toolbar.
Upload a GIF to Tumblr by clicking Upload Photos and selecting the file. Alternatively, click Add Photos From Web and enter the URL of a GIF hosted on a different site.
Publish the GIF to your blog by clicking Post.