I'm not sure if this the place to ask, but is there a tool I can use to preprocess data before inserting to, let's say, Postgres and using this tool to visualis

I'm not sure if this the place to ask, but is there a tool I can use to preprocess data before inserting to, let's say, Postgres and using this tool to visualise it? For example, processing a csv file to rename or add columns, and modify cell values, so that it can be imported cleanly to the db.