CSV Duplicate Row Remover
Remove duplicate CSV records by selected key columns or whole-row identity, keeping the first or last occurrence with explicit matching rules.
Start with your input
Edit the example or replace it with your own text.
Choose your options
These settings are optional. Keep the defaults to get started.
How to use CSV Duplicate Row Remover
- Paste CSV with unique headers and choose key columns.
- Set matching rules and decide whether the first or last matching record survives.
- Remove duplicates, then review the retained rows before replacing the source export.
Record identity is a deliberate choice
Two rows can differ in display name while referring to the same email or customer ID. Select the fields that establish identity for your dataset. An empty key array compares every column. Composite keys use an unambiguous tuple representation rather than a joined string, so delimiters inside cell values cannot cause accidental collisions.
Preserve original values in the retained rows
Trimming and case folding affect matching only; retained cell contents and header spelling stay unchanged. First mode preserves first-occurrence order. Last mode retains the last record for each key and orders those survivors by their positions in the source. Empty key values participate like ordinary values, so decide whether that behavior fits your dataset. Quoted multiline CSV is supported.
Example input
name,email,city Ada,ada@example.com,London Ada Updated,ada@example.com,Oxford Grace,grace@example.com,New York
Is this the same as removing duplicate text lines?
No. It compares parsed CSV records and selected cell values, so quoted newlines and delimiter characters do not split a record incorrectly.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.