# CSV Duplicate Remover

> Remove duplicate rows from a CSV, matching on every column or just a key you choose.

Removing duplicates from a CSV means deciding what counts as a duplicate. Match on every column, or name a key such as email so rows are treated as the same record even when other fields differ. You can keep the first occurrence, the last, or drop every row that was duplicated at all.

**URL:** https://convertto.tech/t/csv-deduplicator
**Category:** Data & Format Tools (https://convertto.tech/c/data-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your csv.
2. Enter or paste your match on columns.
3. Choose the delimiter.
4. Choose the keep.
5. Turn "First row is a header" on or off as needed.
6. Turn "Case sensitive" on or off as needed.
7. The result appears immediately — copy or download it.

## FAQ

### Should I match on the whole row or a key?

A key, when one exists. Matching the whole row treats two records for the same customer as distinct if any field differs by a character — matching on email or ID finds the duplicates that actually matter.

## Related tools

- [CSV Analyser](https://convertto.tech/t/csv-analyser): Profile a CSV: column types, missing values, ranges, distinct counts and outliers.
- [CSV Column Extractor](https://convertto.tech/t/csv-column-extractor): Pull selected columns out of a CSV by name or position, and reorder them.
- [CSV Merger & Joiner](https://convertto.tech/t/csv-merger): Join two CSV files on a shared key, or stack them, with inner, left and outer joins.
- [CSV Splitter](https://convertto.tech/t/csv-splitter): Split a CSV into chunks of N rows, or into separate files grouped by a column value.
- [CSV to Markdown Table](https://convertto.tech/t/table-to-markdown): Turn CSV, TSV or pasted spreadsheet data into a Markdown, HTML or reStructuredText table.
- [CSV Viewer & Table Converter](https://convertto.tech/t/csv-viewer): View CSV data as a sortable table and export it as JSON or a Markdown table.
- [Data Format Converter](https://convertto.tech/t/data-format-converter): Convert between JSON, YAML, XML, CSV, TSV and TOML in any direction, locally in your browser.
- [Excel to CSV Converter](https://convertto.tech/t/excel-to-csv): Export Excel sheets to properly quoted CSV.