...and luckily for you it's free, easy to use, and already installed on your computer.
You'll find it in the list of programmes when you click on your 'Start' menu (probably bottom left of your screen). Mine comes up in a list of icons that looks like this.
It looks very plain and simple, just like a blank sheet of paper, and that's precisely why it saves you blogging time and energy. It has the effect of stripping out bits of code from things you might have copied or worked on elsewhere, keeping things nice and clean to go into your post.
This is a real stitch in time to save nine - although it might not seem like much we promise it will save you time in the long run... and might cause you hassle if you don't.