CSV Deduplicate
Remove duplicate CSV rows by whole row or by a selected column and show how many records were removed.
CSV to ExcelExcel to CSVCSV to JSONJSON to CSVMarkdown TableCSV DeduplicateRemove Empty RowsTransposeSort by ColumnSelect ColumnsSplit CSVMerge CSV
Upload Files
Upload one file. Processing stays in the browser.
Active input: -
Paste Input
Paste CSV, JSON, or Markdown table content directly.
Settings
Result Preview
Load data first and generate a result. The preview will appear here.
How to use
Upload or paste CSV input.
Choose whole-row deduplication or select a column key.
Preview the resulting table and download the deduplicated CSV.
Best for
Deduplicate email lists, phone numbers, or order IDs.
Clean duplicate records before sending out bulk exports.
Quickly validate merged list quality.
FAQ
Which record is kept when deduplicating by column?
The first occurrence is preserved by default.
Can I see how many rows were removed?
Yes. The results area shows how many duplicates were removed.
Does it support non-English headers?
Yes, as long as the header row parses correctly.