Several years back, I put together a simple html page that I have found very helpful over the years. All it does is let you type or paste text into a box, and it outputs that same text in a larger font size below the text box.
This serves two purposes. Mainly, it gives you a place to paste text so you can use Rikai-chan on it. Helpful for when you are copying and pasting from a PDF or Word document, or some random app with Japanese text. I also use it a lot when I am writing, because I often forget if some of the words I am writing are correct or not. This can be simpler and more convenient than pulling up gmail or pastebin or something, and you can use it without an internet connection.
The other function is to simply make the text big enough that you can easily read it. Japanese text (kanji particularly) is, in my opinion, quite hard to read in comparison to English text. If you don’t immediately recognize a kanji, you might have to strain to discern the strokes or radicals that it is made up of. Sometimes I wonder if the reason so many Japanese people have bad eyesight is due to having to strain to read kanji?
But anyways, here it is. You can just right-click on the link and save it to your desktop.