Medium, the website that gives individual writers a platform and in recent years started its own online magazines, offered voluntary buyouts to all of its editorial staff on Tuesday as it announced it was scaling back its journalism.

During a monthly all-hands meeting conducted by videoconference, the staff members were also told that Siobhan O’Connor, the vice president for editorial since 2018, would be leaving the company.

Evan Williams, a Twitter co-founder who started Medium in 2012, explained in a long email to the staff after the meeting that Medium was “making some changes” to its publishing strategy. He said Medium would reduce the budgets of the publications run by the company and redirect resources to supporting independent writers on the platform.

Medium has struggled to find its footing with independent journalism. It began as a blogging platform, allowing anyone to publish, with the goal of building “a new model for media on the internet.” In 2017, the company laid off a third of its workers — 50 people — after Mr. Williams decided to turn away from ad-driven content. In 2019, the company ramped up its own journalism efforts with the introduction of OneZero, a tech and science publication, which was followed by others, including GEN (politics and culture), Elemental (health) and Zora (women of color).