Can anyone explain to me why when asked to type in letters to prove I am human it fails?

It is simple: you are not human.

No, but seriously. Some of them can be touchy if you get just one character wrong. Other will let it slide as long as you get most of it right. Just make sure you look at it good beforehand and do upper and lower case.

There are some sites that have confounded me with this annoyance. Despite repeated, careful, mindful attempts to type the correct letters, I fail every time. And other sites are easy-peasy. But I’m fairly certain I’m human.

The problem is that automated “hacking” tools can distinguish clear images of letters. So in order to frustrate those types of software they have to make letters that take a little human investigation to decipher. Were it not for this feature, this sophisticated software could potentially take down a website in a denial of service attack. By signing up for countless accounts they can flood the system.

I find it equally frustrating when I can’t seem to get them right, however, I understand why they exist. Have you tried the audio version (which most have)? It is equally difficult to understand. =)

I get things like please type the following letters.
ASpad. I do it carefully.
LOL I am human last time I had a check up.

@philosopher I read that as “Asspad”.

Most of such sites also have an option to “listen” to the characters. Try that. I agree that some of these configurations are nearly impossible to decipher. The ones I use at Yahoo Games are generally (99%) readable, but the ones I’ve seen at Comcast, for example, I can only make out by reading about 50% of the time. That’s one reason – out of several – why I avoid Comcast websites by 100%.

PS: Some are also dependent upon UPPER and lower case letters, too.

@erichw1504
I realized that one after I typed it.
LOL.
I didn’t intend it consciously.

@CWOTUS
It takes too much time. I will try your way.
Thank you.

I farking hate those things! I’m dyslexic so if I’m in a hurry, stressed or whatever then not only is it a good chance I already can’t make out the crap scrawl they purposely try to disguise by overlapping and/or distorting the edges of, I might transpose a letter or number and the whole thing goes to shite.

@Neizvestnaya
I was never diagnosed dyslexic but I think I am too. I relate to what you wrote.
When I took a writing class in college. I had a wonderful Professor. He told me that I expressed myself well and my grammar was improving. He said, my only problem is spelling.
At almost nineteen he had me tested for dyslexia. The Psychologist turned me around in circles while I read out loud for a half hour. I almost fainted from dizziness. The Psychologist said, the test is inconclusive. He said, I read too well.
LOL I know I make spelling errors to this day and typos. I think that is why.
I hate those things too.
I also transpose letters and I can only find my errors hours later. Not immediately after I write something.
That is why this sight frustrates me. I need more than minutes to correct errors. The odd thing is I see other peoples mistakes.
When people tease me about mistakes I laugh because I know I am imperfect and; there is little I can do.
I appreciate your honesty.

I find it takes 2 tries, even if you get it right, it wants another one just to be sure I guess. And on some sites you can click on “give me another” or something if yoy’re not sure, it will give you another one