CSV Deduplicator
Remove repeated CSV rows while preserving the first copy and valid CSV quoting.
How to use the CSV Deduplicator
What does the CSV Deduplicator do?
Remove repeated CSV rows while preserving the first copy and valid CSV quoting; It applies this page-specific rule: “Entire row matches” removes only records whose complete set of fields is repeated.
Which inputs does this tool use?
To remove repeated csv rows while preserving the first copy and valid csv quoting, enter CSV data, Input delimiter, Consider rows duplicates when, Deduplicated CSV; keep every value in the same example; where available, choose between Detect automatically, Comma (,), Tab, Semicolon (;), Pipe (|), Entire row matches to match the required format; select Remove duplicate rows when the values are ready; Start with a familiar case covered by this rule - The first matching row is kept - so the expected result can confirm the settings.
How should the tool result be read?
For a result intended to remove repeated csv rows while preserving the first copy and valid csv quoting, the first matching row is kept; read deduplicated csv together with the original csv data rather than as an isolated answer, and confirm that its units or structure match the intended use.
Which duplicate copy is kept?
When the goal is to remove repeated csv rows while preserving the first copy and valid csv quoting, the first occurrence remains and later matching rows are removed.
Can [email protected] match [email protected]?
When using the page to remove repeated csv rows while preserving the first copy and valid csv quoting, yes.
Limits and accuracy
When using this tool to remove repeated csv rows while preserving the first copy and valid csv quoting, capitalization and surrounding spaces are compared according to the selected options; the original formatting of the kept row remains unchanged; check the result in its intended destination before relying on it for important work; keep csv data until the output has been checked in its intended destination.
Choose what makes a row a duplicate
“Entire row matches” removes only records whose complete set of fields is repeated. Selecting a key column removes later rows with the same value in that column, which is useful for email addresses, IDs, or product codes.
The first matching row is kept. The header is preserved separately and never treated as a duplicate data row. Output fields are quoted only when CSV syntax requires it.
Capitalization and surrounding spaces are compared according to the selected options; the original formatting of the kept row remains unchanged.
Frequently asked questions
Which duplicate copy is kept?
The first occurrence remains and later matching rows are removed.
Can [email protected] match [email protected]?
Yes. Select “Ignore capitalization” when the chosen key should be case-insensitive.
Will quoted commas remain valid?
Yes. The file is parsed into fields and serialized back to valid delimited text.