How to Put GIFs on Your Tumblr Sidebar

Upload your GIF to an image host. You can upload it to a Tumblr post, your own Web hosting server or an image-hosting service such as Imgur, TinyPic or Photobucket (links in Resources).
Copy your GIF's URL to your computer's clipboard. Most image-hosting services offer several URL options when you upload a photo; typically, you should copy the link labeled 'For Email' or 'For Layouts.'
Log in to your Tumblr account, click the gear icon at the top of the page and then click the name of the blog whose layout you want to customize.
Click the 'Customize' button in the middle of the page.
Enter the following code into your Tumblr's 'Description' box:Replace 'yourgifurl' with the URL you copied to your computer's clipboard.
Click the 'Save' button at the top of the left column and then click 'Close' to close the customization settings. Check your blog to ensure that the GIF looks the way you want it to in your Tumblr's sidebar.
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