There are a lot of sites offering free tarot card reading online. The field is so crowded that most websites will offer you a free reading, even without registering, in the hope that you will sign up for a free account later on.
Obviously, you can get a lot out of a free tarot card reading, but sometimes there is only so much that randomness and the standard descriptions of the cards can tell you.
More often than not a free tarot card reading online will give you some answers, or at least a little clarity of thought on a particular issue. However, if you are not very well-versed in interpreting a spread of tarot cards, you might struggle a little to understand exactly what the cards are telling you. If you need help understanding what your cards mean, then you may need to pay someone for online live Tarot readings
There are also a few other things to consider, such as:
Which Deck is Being Used?
Depending on your beliefs, or simply your own preference for different symbolisms and interpretations, you may prefer one deck over another. The Rider-Waite deck is the one that will turn up most often, because it is the deck most commonly used in the English Speaking world.
However, if you have a particularly Christian leaning, you might find answers that are more relevant to your spirituality in the Tarot de Marseilles (the original French deck).
However, if your beliefs are more closely aligned with the occult and Qabalistic symbolism, you may wish to find a reader who uses the Thoth Tarot Deck. This deck is rich in diverse symbols from science to mythology, and spans a wide range of belief systems and schools of philosophy and divination.
How is the Deck Shuffled
Most websites use random numbers to shuffle cards and to place them in a spread. This introduces sufficient randomness into the draw that it should be a reading specific to you. Some websites allow you to shuffle the deck yourself, or even to choose the number of shuffles.
If you prefer to have a direct hand in the shuffling of your tarot cards, then look out for websites which offer you this.