If you want a watermark remover that's a good all-purpose tool for removing logos and other objects from photos and videos without degrading the rest of the image, Media.io is a good choice. The all-purpose media processing service has a dedicated Watermark Remover tool, but also offers other AI-based video, audio and image editing tools. Its interface is simple enough to use even if you don't have a lot of technical expertise.
Another tool worth considering is Object Remover, which is designed to remove a variety of objects from photos, including logos, text and people. The AI-powered tool lets you select the object with a brush tool and then delete it with a click. It can handle JPG and PNG files, and it protects data with HTTPS encryption.
If you want a more full-featured photo editor, Fotor offers a powerful online editor with AI automation for tasks like removing backgrounds and removing objects. It also has other tools like batch photo editing, photo optimization and a range of presets and filters. Fotor works on several platforms, so it's good for people who use different devices.