The new BASE64 web utility is online now, it’s fast and totally free. you can use it from here: www5.rptea.com/base64
The old BASE64 online utility can only handle ASCII and UTF-8. The user interface was also very restricted (only accepted short strings and no encoding options).
Now, user have a chance to choose encoding from ASCII and unicodes (utf-7, utf-8, utf-16, utf-32). The length of the input string can be as big as 500K (in bytes).
ASCII encoding/decoding for BASE64 is obviously the fast and small-foot-print choice. However if your string is in other languages such as far-east-languages (Chinese-Japanese-Korean), don’t use ASCII to do encoding and decoding, use unicode instead. Otherwise, you might be able to do the encoding, but decoding will result in funny characters.
I’m using .NET text library to handle the encoding/decoding (or encryption/decryption). It’s so neat to have such function built-in to the framework.
To demo the behind the scene logic, I put together a visual studio 2010 project (in C# .NET 4.0). You can download it and use it for your own purpose.
The source code (VS2010 C# .NET 4.0) Base64Win.zip (46.16 kb)