Find and remove duplicate rows in CSV files online — match across selected columns and export a clean, unique dataset.
Free for files up to 5 MB and 10,000 rows. Files are processed in your
browser — nothing is uploaded to a server. No account required.
About CSV Deduplicator
Find and remove duplicate rows from your CSV data. Choose which columns to compare for deduplication and preview results before downloading.
Essential for cleaning CRM exports, mailing lists, product catalogs, and any dataset where duplicates cause problems.
Related tools
CSV Viewer — Free online CSV viewer to open, search, sort, and paginate large CSV files instantly in your browser — no upload required.
CSV Editor — Free online CSV editor to edit cells, add or delete rows and columns, with undo/redo and instant export back to CSV.
CSV Validator — Validate CSV files online — find missing values, cells that break their column's type, duplicate headers, and mojibake left by a bad export.
CSV Cleaner — Clean messy CSV files online: trim whitespace from every cell, drop rows that are entirely empty, and tidy header names — in one pass, in your browser.
CSV Sorter — Sort CSV files online by one or multiple columns, ascending or descending, with stable multi-key ordering and instant export.
CSV Merger — Merge multiple CSV files online — append rows or join on a shared key column to combine datasets without spreadsheets.