Japanese

example: あいう



Unicode UCS

Space separated value.

example: U+3042 U+3044 U+3046
example: 3042 3044 3046
example: U+3042 3044 3046



UTF-8 Bytecodes
example: 0xe38182 0xe38184 0xe38186
example: E38182 E38184 E38186
example: 0xe38182 E38184 e38186



Console

For bash.

Example:
user1@unbaba:~$ echo $'\xe3'$'\x81'$'\x82'
あ


Currently known bug:
■ U+1F60A is unable to re-encoded.
    1.Add U+1F60A to 'Unicode UCS' text area, and push [Unicode =>] button. 
      'SMILING FACE WITH SMILING EYES' may be shown.
    2.Push [Hiragana =>]' button without editing the text.
    3.Not U+1F60A, U+d83d U+de0a.

This is caused by Javascript String.charCodeAt() with over U+FFFF UCS-2 problem.
About U+1F60A : http://www.fileformat.info/info/unicode/char/1F60A/index.htm