Some years ago I wrote a simple base64 encoding/decoding tool using C# and WinForms. But since it only works on WIndows platform I thought it would be worth re-writing it using Xojo. And here it is, a simple base64 UI for Mac and Windows (maybe also running on Linux but I havn't tried).
You can enter text or paste text from clipboard and encode or decode it easily. You also can load files, even binary files. The UI does not display binary data but keeps it in its buffer, so that decoding and encoding also works with non-text formats. Furthermore there is a simple routine which tries to detect the file-format when binary data was decoded, so that the user gets an idea of what file-extension he sould give the decoded data when saving to file.
Sourcecode can be downloaded here .