QUICK ANSWERStart with the tool that matches your immediate input.
Open Add Image Watermark first when its stated purpose matches the result you need now. Use Batch Image Watermark only when it solves a separate next task.
This guide is for creators, marketers, designers, and website owners. Start with Add Image Watermark when your immediate task is to use the Add Image Watermark to complete this file task privately in your browser. Move to Batch Image Watermark only when you also need to use the Batch Image Watermark to complete this file task privately in your browser.
The goal is not to run two tools automatically. It is to finish the first narrow task, inspect its result, and then decide whether Batch Image Watermark solves a genuinely different next step.
Both tools sit in Image & Design, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.