If you don’t have Google account then make one for free.
Now click in box just under your profile picture and type number of receiver of sms.
You’ll get a box at right bottom like the box in below picture. Type your message in given box and send that.
But one bad thing is that you have only 50 free sms credits. You can buy more if you want. Gmail is giving free 10GB for your email inbox and you can use Google drive too for storing your files with 5GB of free space. So I think if you are not using Google then you should sign up fot this. Its email service is most secure because it can help you by removing your IP address from header of email so that person who receives your email cannot attack your IP address.