CAPTCHAs are used by websites to ensure humans are accessing online services and content. Some 200 million CAPTCHAs are solved around the world every day, according to Google's reCAPTCHA service. The average Web user takes around 10 seconds to solve a CAPTCHA puzzle, but if you can't see the word or number you're supposed to be deciphering, getting past a CAPTCHA will probably take up a great deal more of your time.
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If you can see that something's displaying where you'd expect a CAPTCHA to be but it's completely illegible, hit the "Refresh" button next to the words or numbers you've been tasked with decoding to get a new puzzle. Some CAPTCHAs are distorted through the use of blurring or wiggly lines to such a degree that the characters displayed are completely unreadable. You'll typically be able to refresh your puzzle as many times as you like, but CAPTCHA programs that go to great lengths to make their puzzles indecipherable to robots tend to do so consistently, so it may take you a while to find one you can make out.
Hit the "Audio" button next to your CAPTCHA if repeated refreshes have failed to throw up a readable puzzle. You'll be played an audio file of a robotic voice reeling off numbers or letters for you to enter into your CAPTCHA answer box. Audio CAPTCHAs are distorted to make them unreadable to voice recognition software, so you could struggle to make them out if you're a little hard of hearing or are using a device with poor quality audio playback.
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