Is it possible to withdraw an offer?
Can I withdraw my offer to purchase a home?
In most cases, the answer is yes, right up to the point until it has been accepted, or even in some cases, if you have not yet been notified that the other party has accepted the offer.
If you do want to revoke your offer, be sure to do so only after consulting an attorney, who is experienced in real estate matters. You do not want to lose your earnest money deposit, or find yourself being sued for damages the seller may have suffered by relying on your actions.