500px offers a Suggested Keywords feature that automatically analyzes uploaded photos and recommends relevant tags to help photographers make their images more discoverable. The feature is available on both the mobile app and web uploader.

According to 500px's official support documentation, 'Suggested Keywords are keywords that we automatically recommend to add to your photo during the upload process.' A separate 500px blog post confirms that 'when you upload a photo to 500px, a list of suggested keywords appears based on the people, objects, and location in your photograph,' referencing AI-driven image understanding. Photographers can accept the suggestions with a tap or click, or add their own keywords. The feature was first introduced on mobile and later expanded to the web.