Image Toolbox is an open source Android app for social media creators

“For you, as a content creator, the tools that matter the most are batch processing, format conversion, the 61 built-in export presets sized for platforms like Instagram, X, and YouTube, background removal, and watermarking. The latter, background removal, comes in both automatic and manual modes, with a choice of models including MlKit, U2Net, RMBG, and BiRefNet.” It has many such tools, and is available both on the official Play Store (published by ProgiX), but also on the F-Droid store. See https://itsfoss.com/image-toolbox