I have been using Imiwa as my primary Japanese dictionary for some time now. However, it wasn’t until just recently that I started taking care of a very useful feature to make learning Japanese words that much easier: Export list (E-mail CSV).
Here’s the way it works:
Each time you look up a word there is a little star that you can click on to add it to your favorites. I do this with any word I look up and think is common enough that I will use it. If you click on lists, there is an option to e-mail csv. This list can then be directly loaded into Anki. This will save you a lot of time putting the Japanese words into Anki so you can spend more time actually studying them.
I recommend that you then delete the list so you don’t end up with any duplicates. Anki is supposed to check for duplicates, but I like to keep things simple. Not to mention that when the list gets too big, it is mostly unusable anyways. Too many words without a search function.
Not using Anki? You can get it here: Anki
You can find Imiwa here: Imiwa