The Swiss star, who will turn 36 in three weeks, eased past the mark of seven All England Club titles he had shared with Pete Sampras since 2012 with a 6-3, 6-1, 6-4 win over injury-hit Marin Cilic in the final.
It was 16 years ago when Federer famously defeated Sampras at Wimbledon to announce himself as a star in the making. However, it wasn't until 2003 that he captured his first title at the All England Club.
Now he has 19 Grand Slam titles, four clear of closest rival Rafael Nadal on the all-time list.
"I didn't think I was going to be this successful after beating Pete here," said Federer, who also won a fifth Australian Open in January. "I hoped to have a chance maybe one day to be in a Wimbledon final and have a chance to win the tournament.
"Winning eight is not something you can ever aim for. If you do, you must have so much talent and parents and the coaches that push you from the age of three on, who think you're like a project. I was not that kid."
Federer had been written off as a faded force when he was knocked out of Wimbledon in the semi-finals by Milos Raonic last year. He immediately shut down his season to rest a knee injury, so for the first time in his professional career he went through an entire campaign without adding to his trophy haul.
But his Australian Open triumph led to back-to-back Masters titles at Indian Wells and Miami before he skipped the clay court season.
A ninth Halle grass court title followed and his record triumph in south- west London took his career trophy collection to 93.
The straight-sets cruise against Cilic meant Federer was the first man since Bjorn Borg in 1976 to win the title without dropping a set. He is also the oldest Wimbledon men's champion of the modern era.
"I'm incredibly surprised how well this year is going, how well I'm feeling, how I'm managing tougher situations, where my level of play is on a daily basis," added Federer.
"I guess you would have laughed, too, if I told you I was going to win two Slams this year. People wouldn't believe me if I said that. I also didn't believe that I was going to win two this year."
Federer insisted he intends to defend his title next year despite delivering what many fans fear sounded like a farewell speech to Centre Court.
"We never know what happens," said the Swiss star, who had told the crowd in his victory speech: "I hope to be back, I hope this wasn't my last match."
He later clarified his remarks, saying: "Honestly, ever since I had the year I had last year, I think a year ahead of time with my schedule.
"So I totally see myself playing here this time next year.
"There's never a guarantee, especially not at 35, 36. But the goal is definitely to be here again next year."