One of the best ways to earn passive income online is by selling stock sound effects. Once you upload your sounds to major marketplaces, they can continue generating revenue for months or even years.
Start by recording everyday sounds, footsteps, rain, doors closing, or ambient noises. Clean up the recordings using audio editing tools and save them in professional formats like WAV or MP3.
Upload your files to platforms such as AudioJungle, Pond5, and Motion Array. Each download earns you a royalty, and the more sounds you publish, the higher your income potential.