where can i find online japan dictionary?

Question

pdf or exe will be fine too :)

Answer 1

(I'm assuming you mean Japanese-English dictionaries. If not, apologies.)

Personally, I prefer Jim Breen's WWWJDIC, an interface for several dictionary files, including EDICT (general Japanese-English dictionary) and ENAMDICT (database of Japanese names).
http://www.csse.monash.edu.au/~jwb/wwwjdic.html

Some others that I have seen recommended:
http://linear.mv.com/cgi-bin/j-e/euc/dict
http://www.excite.co.jp/dictionary/japanese_english/
http://dictionary.goo.ne.jp/
(some of these have Japanese interfaces)

And if you're just looking to copy-paste a large chunk of text to translate kanji and katakana, Rikai.com is excellent.