QUICK ANSWERStart with the tool that matches your immediate input.
Open Batch File Renamer first when its stated purpose matches the result you need now. Use Clean CSV File only when it solves a separate next task.
This guide is for writers, office teams, students, and data workers. Start with Batch File Renamer when your immediate task is to use the Batch File Renamer to complete this file task privately in your browser. Move to Clean CSV File only when you also need to use the Clean CSV File 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 Clean CSV File solves a genuinely different next step.
Both tools sit in Documents & Files, but they handle different inputs or outcomes. Keeping those roles separate reduces repeated work and makes verification easier.