Find and eliminate duplicate rows from your CSV files in seconds. Everything runs in your browser � your data never leaves your device.
Client-side only � your data stays private.
Cleaned CSV will appear here...Load CSV and click Remove Duplicates
Three simple steps to remove duplicates from your CSV files.
Paste your CSV data directly into the input area or upload a file. Columns are auto-detected.
Select which columns to check for duplicates and whether to keep the first or last occurrence.
Preview the cleaned data and copy to clipboard or download as a new CSV file.
A CSV Duplicate Remover is a utility that identifies and deletes duplicate rows from a CSV file. Duplicates commonly arise from data entry errors, repeated imports, or merged datasets. Manually finding and removing them can be tedious, especially with large files.
This tool lets you check for duplicates based on all columns or a specific column, and choose whether to keep the first or last occurrence. Everything runs entirely in your browser, so sensitive data never leaves your device.
Ensure data accuracy
Duplicate rows skew analytics, reports, and database imports.
Reduce file size
Removing duplicates shrinks your dataset for faster imports.
Prepare clean imports
Databases reject duplicate primary keys � clean data prevents import errors.
Save time
No need to open a spreadsheet � deduplicate right in your browser.
Paste or upload your CSV, optionally select a column to check for duplicates (or leave it set to "All columns"), choose whether to keep the first or last occurrence, and click Remove Duplicates. The cleaned result appears immediately in the output panel.
When duplicates are found, "keep first" retains the earliest row and removes later duplicates. "keep last" retains the most recent row and removes earlier duplicates. Choose based on which version of the data you want to preserve.
Yes. Use the column dropdown in the sidebar to select a specific column. Rows with the same value in that column are treated as duplicates. Leave it on "All columns" to compare every field.
Yes. You can select one or more columns to define uniqueness. The tool removes rows where all selected columns have identical values. You can also choose to keep the first or last occurrence.
For a complete CSV workflow, explore our other free tools:
All processing happens in your browser. Your data never leaves your device.