If you want to make professional-looking composites and collages out of your photos, Fotor is a good option. This all-purpose online photo editor has a lot of tools, including AI-based options for one-click photo optimization, background removal and object removal. It also can be used to make collages and export photos without a watermark, though you'll have to pay for the Fotor Pro subscription for full features. It's available for Windows, Mac, iOS and Android, so you can use it on whatever device you have.
Another good option is PhotoScissors. It's good at automatically selecting backgrounds and objects, which is handy for making photo composites. It's got bulk background removal, background replacement and support for hair and transparent objects. It's also got color and transparency controls, so it's good for making unusual and professional-looking composites.
Colorcinch is a simple interface that uses AI-powered effects to turn photos into various forms of art. It's got one-click background removal, collage creation and advanced control over elements through its layers panel. It's also got artistic masks, overlays and multi-style brushes, so it's good for personal and professional use.
Last, Pixlr offers a broad range of photo editing and design tools. That includes Pixlr Editor for serious photo editing, Pixlr Express for quick edits, and Pixlr Designer for templates and animations. Pixlr also has AI tools for background removal, face swapping and object movement, along with a collage maker and product shot creator. It's available on the web, desktop and mobile devices.