Privacy first. Your files are processed entirely in your browser — we never see them.
CSV Deduplicator

Remove duplicates.
Keep your data clean.

Upload a CSV or spreadsheet and instantly remove duplicate rows. Configure by any column combination, preview every change in a before/after diff, then export the clean file. Zero server uploads.

✓ File never leaves browser
✓ Before/after diff
✓ Export CSV or Excel
Upload File LOCAL ONLY

Drop a CSV file here

Click anywhere or drag & drop. Max 50MB.

Choose File
.csv .tsv .txt (delimited)
Parsing file...
Your file never leaves this tab
Configuration —
Deduplicate by columns (select one or more)
Case sensitivity
Keep which duplicate
All columns selected
—
Total rows
—
Duplicates found
—
Unique rows
—
Reduction
Before — rows
Duplicates highlighted
After — rows
Duplicates removed
Ready to export
—