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Data Deduplicator

Remove duplicate rows from CSV or plain-text data by any selected column. Choose case-sensitive or insensitive matching. Free, browser-based.

📊 Data & CSV Tools Free Browser-based

Tool

Mode

Case-sensitive matching

Input data

Deduplicate by column

Result

Deduplication Modes

Mode	Input	Deduplication Key
CSV	CSV with headers	Value in selected column
Plain text	One item per line	Entire line content

What Is Kept

When duplicates are found, the first occurrence of each unique value is kept and all subsequent duplicates are removed. The original row order is preserved.

'Is my data uploaded to a server?','a'=>'No. Everything runs locally in your browser using JavaScript. Your data never leaves your device.'], ['q'=>'Can I deduplicate by multiple columns?','a'=>'Currently one column at a time is supported. For multi-column dedup, use the CSV Editor to concatenate columns into one, deduplicate, then remove the helper column.'], ]" />