Get Japanese furigana for any website or text

If you're looking to add furigana to an entire Japanese website, just drop the URL into Hiragana.jp. It'll add furigana to the entire page for you, and then you can click through the website normally and have furigana on every page.

If you've got a block of text that isn't on a website for which you want the furigana, then simply copy and paste it into Furiganizer. It'll do the same thing that Hiragana.jp does for websites for whatever block of text you dump in.