Go to PhotoJoiner and tap the green Create Collage button.However, while you’re working in PhotoJoiner, be prepared for pop-up ads that frequently take over the screen. Users on a budget will appreciate that this is a free app with no watermark. Some users have reported that it’s not very intuitive, and cropping images may be more difficult than other programs. It’s not the most robust photo editor, but if you only need to merge photos, it will do the job most of the time. Because it’s a web app, PhotoJoiner is OS agnostic and will work on any computer with a decent internet connection. PhotoJoiner is an online tool that allows users to combine pictures online for free without downloading any software.