Here we've gathered together a number of websites that have conversion functions.
Hopefully you'll find something useful for your studies amongst them.
簡体字・繁体字⇔日本語漢字変換 (Chinese-Japanese Kanji Converter)
This is a website where you can convert simplified/traditional Chinese characters into pinyin (Chinese romanization), or Japanese kanji into simplified chinese, traditional chinese and pinyin in one fell swoop.
If you wanted to know how the Chinese language is displayed in Japanese kanji, we think this tool is pretty useful.
This service is part of the '楽訳中国語辞書' website.
Japanese in Anime & Manga (Introduction article)
In the ‘Character Line-up’ section of ‘Character Expressions,’ you can instantly see how expressions differ for each character.
You can also enjoy looking at the different expressions used by the samurai, butler, girl etc. in quiz form on the same website.
Sci.lang.japan Frequently Asked Questions (Introduction article)
This is a website that has a variety of conversion functions.
For example, there's...
an English to katakana converter, romaji to kana, kana to romaji and Arabic numerals to kanji numbers.
Makes for good kanji study too, don't you think?
Arabic numerals to kanji numbers conversion
Let's see if you can convert me into a dandy!
Whoosh!
Ta-daa!!