Excel/CSV Sheet Duplicate Value Finder

Identify and highlight duplicate cell values across rows, columns, or sheets in Excel and CSV files.

1. File Selection

Upload Excel or CSV File (.xlsx, .xls, .csv)

Waiting for file upload...

2. Sheet Selection

Select Active Sheet:

3. Duplicate Criteria

Column-wise Detection Row-wise Detection Any Cell Detection Case Sensitive Matching

Min Content Length:

4. Row & Column Headings

First Row Contains Column Headings First Column Contains Row Headings Exclude Header Cells from Analysis

5. Skip Rows & Columns

Skip Rows (e.g. 1, 2 or 1-3): Skip Columns (e.g. A, B or 1, 2):

Duplicate Detection Results

Total Cells: 0 Unique Duplicates: 0 Duplicate Cells: 0

Upload a file to detect duplicates

Spreadsheet Preview

Duplicate cells are highlighted below. Click any result entry above to jump to its locations.

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Note: This is a static web page that runs locally in your browser — no data is sent to any server. If preferred, you can also download it as an HTML file and run it offline or clone from Web-Tools (MIT License).