The 36-year-old is the number two keeper behind Victor Valdes and as a result has made just 11 league appearances since joining from Celta Vigo in 2008.
However, Pinto has insisted that he is happy with life at the Spanish champions.
"It's great to continue with this club," he told the club's official website. "For me, it's the best present.
"I [only] came for six months and I've had a great time. Personally, I've found myself in a dressing room which I like very much.
"It's a very special moment for me that myself and my family are enjoying."
Pinto has also played for Real Betis.