Image2Base64 is an online tool, provided by Acid.JS Web.UI for conversion of image files to base64 data URIs. It implements the new HTML5 File API, and the selected images are processed entirely on the client without uploading them onto the server. It is available 24/7 here for free.
You don’t need to download or install anything. Just go to http://image2base64.wemakesites.net and start using it right away!