500px (pronounced "five hundred px") is a global online photo-sharing platform that is a subsidiary of Visual China Group. It is based in Toronto, Ontario, Canada. It was co-founded by Oleg Gutsol and Evgeny Tchebotarev on October 31, 2009.

Evgeny Tchebotarev started 500px in 2003 on the social blogging website LiveJournal as a hobby, while he completed a business degree at Ryerson University (now Toronto Metropolitan University). At the time, 500 pixels was considered a good size for web display and was therefore the limit placed on photos submitted to the community for review. Once photographers submitted their photos, they were moderated, and only those of high quality would make it past the community's curators and be published on the site.

Tchebotarev joined forces with Oleg Gutsol and in early 2009, they began work on the mostly automated incarnation of 500px. Image size grew to 900 pixels but the name remained. The two launched the official site on October 31, 2009.

In 2009, the site had 1000 users, purely through word of mouth. By late November 2012, the site had more than 1,500,000 users.

500px's blog was named one of the best blogs of 2012, by Time magazine.

In July 2015, the company raised $13 million in Series B funding led by a strategic investor, the Visual China Group, and included participation from existing backers of the company.

In August 2015, the company launched a new version of its iOS app.

In November 2016, the company launched 500px Studio, which allows brands to access custom and on-demand photography from 500px's photographers after their launch of a global photographer directory.