#002 · Spreadsheet Cleanup Tool

Remove Duplicate Rows from Excel

Find repeated spreadsheet rows and create a cleaned workbook that keeps the first occurrence of each row.

Office File Tool

One spreadsheet
row
rows
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How to use this office tool

  1. Choose a spreadsheet and select the worksheet to clean.
  2. Set the header row and decide whether completely empty rows should remain.
  3. Run the duplicate scan, review counts, and download the new cleaned workbook.

What this tool does

The tool compares every cell in each data row and removes later rows whose complete normalized value sequence matches an earlier row.

All cells in a row form the duplicate key; the first matching row is retained

Rows are compared by displayed cell values. Hidden formatting differences do not make otherwise identical rows unique.

Supported formats

Files are processed in memory on this device. Large or structurally complex workbooks may require desktop spreadsheet software.

InputSupport
XLSX / XLSParsed locally with SheetJS CE
CSV / TSVSupported with delimiter-aware parsing
Limits25 MB per file, bounded preview, up to 500,000 used cells

Tips for better results

  • Make capitalization and whitespace consistent before deduplication.
  • Keep a backup when duplicate meaning depends on business rules.
  • Inspect the removed count before distributing the cleaned file.

FAQ

Which duplicate row is kept?

The first occurrence is kept and later rows with the same complete normalized value sequence are removed.

Does the header row participate in duplicate detection?

No. The selected header row and rows above it are retained, while duplicate checks apply to the data rows below.

Are rows with the same values but different formatting duplicates?

Yes. This tool compares displayed cell values, not fills, fonts, borders, or other formatting.

Can I remove duplicates based on only one column?

This version compares full rows. For one-column matching, extract that column first or use a dedicated key-column duplicate tool.

Will blank duplicate rows be removed?

Completely blank rows are handled according to the Keep empty rows option; repeated nonempty rows are deduplicated.

Processing details

Processing detailBehavior
Browser processingNo file upload
Preview5–100 rows
OutputNew generated file

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