How to remove duplicate rows from a CSV

Step-by-step approach

Decide whether a duplicate means all cells match or only an ID column matches.
For identical records, open CSV Duplicate Row Remover.
Inspect the removed count; identical records are compared after import.
If only a subset of fields should determine uniqueness, use a dedicated key-based workflow instead of deleting blindly.
Download the new dataset and compare a few representative rows.

Try the matching tool

Open Duplicate Row Remover to work on a local copy. Review the result before importing it elsewhere.

What this does not solve

Browser tools can validate known structures and transform available data, but cannot restore deleted or corrupted bytes, infer unknown business facts, or guarantee that a target system will import every field as intended.