Remove Duplicate Rows

What is Remove Duplicate Rows?

Remove Duplicate Rows is a free, browser-based tool that helps you tidy up and standardize messy datasets. Strip duplicate rows from CSV or JSON. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

How to use Remove Duplicate Rows

1Paste or drop your data.
2Pick the cleaning rules to apply (the tool previews what changes).
3Copy or download the cleaned result.

Features

Previews changes before you apply them
Handles empty cells safely (never silently zeroed)
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Quick one-off cleaner jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

Used by

Data analysts
Operations teams
Researchers
QA engineers
Data cleaning teams
Analysts

Common errors

Rows are deleted before duplicates, blanks, or null-like values are measured.
Whitespace is left in headers, making joins and imports fail later.
Missing values are filled without checking whether blanks are meaningful.
Original data is overwritten before the cleaned output is reviewed.

How it works

1Reads the source data.
2Applies the selected cleanup rules to rows, columns, or values.
3Shows a result you can review before export.

Recommended workflow

1
Prepare the input
Clean obvious quality problems before analysis, imports, dashboards, or automation.
2
Run Remove Duplicate Rows
Review the preview, copy or download the result, and keep everything local in your browser.
3
Next recommended tool
Duplicate Analysis: Quantify exact and near-duplicates.
Open tool
4
Then continue with
Trim Whitespace: Trim leading/trailing whitespace in every field.
Open tool
5
Then continue with
Null Value Cleaner: Replace, drop, or report null/empty cells.
Open tool

Frequently asked questions

How do I use Remove Duplicate Rows?: Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Strip duplicate rows from CSV or JSON.
Is my data uploaded or stored anywhere?: No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
Is Remove Duplicate Rows free?: Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.
What's the maximum file size?: There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.
Do I need to install anything?: No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.