Data / Batch cleanup
CSV Merge & Deduplicate
Combine matching spreadsheet exports into one clean CSV, align columns by header, and remove repeated rows without uploading the source files.
Runs entirely on your deviceNo uploads, accounts, cookies, or personal tracking.
Source files
2–20 files · 25 MB each
Drop CSV or TSV files hereor choose them from your deviceHeaders are matched by exact text after trimming.
Files0
Rows0
Duplicates removed0
1. Add your data
Choose 2 to 20 CSV or TSV files.
2. Choose the result
Merge columns by header and choose whether to remove exact duplicate rows.
3. Save it locally
Review the totals and download one combined CSV.
About this tool
Use CSV Merge & Deduplicate without an upload
Combine matching spreadsheet exports into one clean CSV, align columns by header, and remove repeated rows without uploading the source files.
The operation runs in the current browser tab. Tool input is not included in aggregate analytics, and the standalone download makes no analytics requests.