CSV duplicate finder
Find repeated records by selected columns and download unique rows and duplicates.
Your results
CSV duplicate finder
Review repeated spreadsheet records using the columns that identify a duplicate in your dataset. Download the unique rows and duplicate report to investigate repeated entries. Choose keys carefully so unrelated records are not treated as the same item.
How to use this tool
- Choose a file, drag it into the upload area, import a public file URL, or paste your text below the upload options.
- Review the settings and create your result.
- Download and check the output before using it.
Supported input formats
CSVTSVTXT
Available settings
- Matching
Output and limitations
Find repeated records by selected columns and download unique rows and duplicates.
Comma-separated CSV with unique headers. The first occurrence is retained; every row in a duplicate group appears in the duplicate report. Blank keys are rejected rather than merged. Upload a UTF-8 file up to 5 MB or paste up to 12,000 characters. An uploaded file takes priority. Up to 10,000 rows and 100 columns. Formula-like spreadsheet cells receive a protective apostrophe.
Where are my files processed?
Selected files are processed in your browser. Importing a URL uses the download service to retrieve the remote file.
What if processing fails?
Check the supported formats and file limits, then try a smaller file. Keep an original copy. A clear error message will explain an unsupported input or an unavailable processing service.