De-Duplicator
Remove duplicate rows from CSV and Excel
Delete duplicates in your browser — no spreadsheet upload to our servers. Pick the columns that define a match; the first row is kept.
- 1File
- 2Columns
- 3Download
Drop a CSV or Excel file
or choose a file from your computer
Choose file.csv, .xlsx, or .xls
Keeps the first matching row, removes later duplicates.
Common questions
- Does this send my file anywhere?
- SafeRows is built so your spreadsheet is read in this browser, not sent to our servers for cleaning. Loading the site still fetches ordinary page files (HTML, scripts, styles) from hosting, like any website. We do not operate an upload API for CSV or Excel contents.
- Can my IT see this?
- Spreadsheet contents are not uploaded to SafeRows. IT may still see that you visited the site (network logs, device management, browser extensions).
- What happens if I close the tab?
- The file is held in that browser tab’s memory while you work. Closing the tab discards it in this tool. We do not keep a copy. If you downloaded a cleaned file, that copy stays wherever your browser saved it.
- How does keep-first dedupe work?
- You choose one or more columns that define a duplicate. Rows that match on every selected column are treated as duplicates. The first matching row is kept; later duplicates are removed. Matching ignores extra spaces at the start or end and is case-sensitive.
- Which file formats are supported?
- CSV and Excel: .csv, .xlsx, and .xls. For Excel files, only the first worksheet is used.