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Karp began his career, without having received a high school diploma, as an intern under Fred Seibert at the animation company Frederator Studios, where he built the studio's first blogging platform and conceived, wrote, and edited their first internet video network, Channel Frederator. Karp went on to work for online parenting forum UrbanBaby until it was sold to CNET in 2006. Karp then started his own software consulting company, Davidville, where he worked with computer engineer Marco Arment on projects for clients. During a gap between contracts in 2006, the two began work on a microblogging website, which was launched as Tumblr in February 2007. As of November 1, 2017, Tumblr hosts over 375.4 million blogs. In August 2009, Karp was named Best Young Tech Entrepreneur 2009 by BusinessWeek and in 2010, he was named to the MIT Technology Review TR35 as one of the top 35 innovators in the world under the age of 35.

Karp endorsed Hillary Clinton for president in the lead-up to the 2016 United States election.

—Karp in an interview with Fast Company about his first day of work dedicated solely to Tumblr

Karp joined the Planned Parenthood Board of Directors in 2014. In March 2017, Tumblr and Planned Parenthood launched an initiative calling on the tech industry to support Planned Parenthood.

On May 20, 2013, it was announced that Yahoo! and Tumblr had reached an agreement for Yahoo! to acquire Tumblr for $1.1 billion. Karp remained CEO of the company. Karp announced in November 2017 that he would be leaving Tumblr by the end of the year.

On May 20, 2013, it was announced that Yahoo! and Tumblr had reached an agreement for Yahoo! to acquire Tumblr for $1.1 billion. As of November 1, 2017, Tumblr hosts over 375.4 million blogs. Karp announced in November 2017 that he would be leaving Tumblr by the end of the year.

Beginning in 2011, Karp's girlfriend was Rachel Eakley, a psychology graduate and nursing student. They lived together in Williamsburg with their pet dog, Clark. The pair split in 2014.

In October 2007, Karp shut down his consultancy business as his work with Tumblr was interfering with his client work. Davidville was renamed Tumblr, Inc. and 25 percent of the company was sold to a small group of investors.

Karp left UrbanBaby after it was sold to CNET in 2006. Using money from the sale of his shares, Karp started his own software consultancy company, Davidville, functioning as a mix of client work and production of Karp's own products and services. Marco Arment joined the company as an engineer after replying to Karp's Craigslist ad. Karp had been interested in microblogging for some time and was waiting for one of the established blogging platforms to introduce their own microblogging platform. After a year of waiting, Karp and Arment began working on their own microblogging platform during a two-week gap between contracts in 2006. Tumblr was launched in February 2007 and within two weeks, the service had gained 75,000 users.

David Karp (born July 6, 1986) is an American web developer and entrepreneur. He is the founder and former CEO of the short-form blogging platform Tumblr.