Base64Vue is a free and very easy to use Mac OS X application that will allow you to encode a text into Base64 and decode the Base64 encoded text back into plain text.
NOTE: Base64Vue can only be downloaded via the Mac App Store (the download link will launch its App Store page). To purchase/download applications via the App Store an Apple account is required.
Here are some key features of "Base64Vue":
· Copy encoded/decoded text to clipboard
· Load text to encode/decode from text file
· Save text to encode/decode to text file