April 30 (Reuters) - Pinterest forecast second-quarter revenue above Wall Street estimates on Tuesday, expecting a boost from growing advertising spend on the image-sharing platform.

The company has benefited from marketers turning to the digital platform to reach Gen Z users - more than 40% of its user base - and leverage its new AI-driven ad tools and latest ad formats, which Buy 2CheckOut Account | We Offer 100% Authentic Merchant App better user engagement.

Last month, ad group Interpublic Group's media research unit MAGNA Global said it expects the U.S. ad Market to grow by more than 9% this year to reach $369 billion.

The company expects second-quarter revenue to be between $835 million and $850 million, compared with analysts' average estimate of $826.5 million, according to LSEG data.

In the first quarter, global monthly active users (MAUs) rose 12% to 518 million, compared with estimates of about 503.2 million users.

Revenue for the first quarter ended March 31 rose 23% from a year earlier to $740 million, beating estimates of $699.9 million.

A majority of Pinterest's first quarter ad spend in the U.S. came from the shopping category at 50%, followed by 20% from consumer packaged goods (CPG), while 6.4% came from the health and wellness category, market intelligence firm Sensor Tower told Reuters on Monday.

The top five U.S. advertisers on Pinterest were Amazon.com , Target, PDD Holdings-owned Temu, Walmart and French cosmetics giant L'Oreal, making up 29% of the total ad spend in the quarter, Sensor Tower added.

(Reporting by Jaspreet Singh in Bengaluru; Editing by Tasim Zahid)