How to use this office tool
Upload one CSV or TSV file. The first row can be retained as a header, while duplicate data rows are removed using all field values.
#180 · CSV & Delimited Files Tool
CSV Duplicate Row Remover
Remove repeated CSV or TSV rows using normalized field values and download a freshly generated, injection-aware CSV file.
Office File Tool
Local browser processingrow
rows
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What this tool does
Rows are compared after optional whitespace trimming. The first occurrence is kept and a new CSV is generated with formula-injection protection when enabled.
Rows are compared after optional whitespace trimming. The first occurrence is kept and a new CSV is generated with formula-injection protection when enabled.
The comparison is exact after the selected normalization; similar spellings are not fuzzy-matched.
Supported formats
XLSX, XLS, CSV, and TSV are accepted where the operation supports them. Browser memory, parser support, and Excel worksheet limits apply.
| Format | Support |
|---|---|
| XLSX / XLS | Parsed locally; advanced workbook objects may not be preserved |
| CSV / TSV | Quoted fields supported; encoding is read by the browser |
Tips for better results
- Keep “Protect text values” enabled for safer CSV exports.
- Trim whitespace when spaces are accidental.
- Confirm whether letter case should distinguish records.
FAQ
Does the duplicate row remover keep the first occurrence?
Yes. The first row for each normalized full-row value is retained.
Can whitespace be ignored when comparing CSV rows?
Yes. Enable Trim cell whitespace to compare trimmed field values.
Is the header row included in duplicate detection?
The first row is kept separately when the header option is enabled.
Are quoted fields parsed before duplicates are checked?
Yes. The CSV parser resolves quoted delimiters and escaped quotes first.
How does CSV formula-injection protection work?
When enabled, exported values beginning with =, +, -, or @ receive a leading apostrophe.
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Processing summary
| Stage | Action |
|---|---|
| Input | Validated and parsed locally |
| Output | A newly generated file is downloaded |
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