ABF Guide · Practical workflow
How to remove duplicate CSV or line records without uploading the file
Duplicate removal is safest when you first decide what counts as the same record. Exact-line deduplication is simple; key-based deduplication can change meaning if columns are not chosen carefully.
Keep the original
Work on a copy so you can compare row counts and recover any record removed by mistake.
Define duplicate rules
Decide whether identical full lines are duplicates or whether specific columns define uniqueness.
Normalize cautiously
Whitespace or case normalization can help, but only apply transformations you understand and can reverse.
Check the result
Compare counts, inspect a sample of removed records and save the cleaned output under a new name.
Open the CSV / Line Deduplicator
Remove duplicate line records locally in the browser and copy the cleaned result.
Open the CSV / Line DeduplicatorCheck important outputs against your own source records before relying on them for operational, financial or customer-facing decisions.