Duplicate Finder
Find and highlight duplicates without deleting anything.
A read-only audit of your data: see every duplicate group, how many times each value repeats, and exactly which rows are involved. Export the report or download a copy of the workbook with duplicates highlighted.
- Price
- Free
- Your files
- Never uploaded
- Runs
- In your browser
or drag it here
.xlsx, .xls, .csv · up to 50 MB · processed locally, never uploaded
Excel and spreadsheet files only. Export from Google Sheets as .xlsx or .csv.
Files stay on your device
What it does well
- Duplicate groups sorted by frequency with row references
- Highlighted XLSX export using real conditional formatting
- Near-duplicate detection that catches typos and spacing differences
How to use Duplicate Finder
- 1
Upload your file and choose the sheet.
- 2
Select the columns to check for duplication.
- 3
Browse the grouped report, sorted by occurrence count.
- 4
Export the report or the highlighted workbook.
Watch a walkthrough
Common problems and fixes
Every row is reported as unique.
You are checking a column that contains a unique ID. Deselect it and check the business columns instead.
The highlighted export opens without highlighting.
Some viewers ignore conditional formatting rules. Open it in Excel or LibreOffice, or export the plain report instead.
Frequently asked questions
More clean & format tools
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