Delimiter, quoting, row, and column boundaries are inspected separately.
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Data & developer
CSV Deduplicator & Duplicate Finder
Detects comma, semicolon, or tab delimiters, parses quoted fields, and keeps the first or last row by a selected column list. Case and surrounding-whitespace normalization are explicit options.
✓ Free✓ No account✓ In-browser
QUICK ANSWER
What does this tool do?
Find and remove duplicate CSV rows by selected columns.
APPLICATION AND DECISION GUIDE
CSV Deduplicator & Duplicate Finder: method and usage
Detects comma, semicolon, or tab delimiters, parses quoted fields, and keeps the first or last row by a selected column list. Case and surrounding-whitespace normalization are explicit options.
CSV, TSV, tabular, or delimited records with a consistent header and row shape Confirm the shape first with a small example containing no personal data.
row and column totals, normalized records, and locations of problematic cells
Practical steps
- Paste CSV with a header and enter key columns.
- Choose matching rules and which row to retain.
- Review duplicate counts and download the cleaned CSV.
header count, row width, quote escaping, and representative records opened in the target table
Verify schema, encoding, and data-loss assumptions in the target system.
Suitable use cases
- Cleaning email lists
- Deduplicating exported records
- Data-quality checks before merging
LEARN THE WORKFLOW
Guides for this tool
Safely Converting YAML, XML, JSON, and CSV in the Browser
A parsing, flattening, deduplication, and schema-validation workflow that avoids silent data loss.
Read guide →Reliable Scheduling with Cron and Unix Time
Prevent time zones, DST, field order, and second-vs-millisecond mistakes from breaking scheduled jobs.
Read guide →ABOUT THIS TOOL
Frequently asked questions
What input does CSV Deduplicator & Duplicate Finder accept?+
CSV, TSV, tabular, or delimited records with a consistent header and row shape Paste CSV with a header and enter key columns.
What does CSV Deduplicator & Duplicate Finder return?+
row and column totals, normalized records, and locations of problematic cells Delimiter, quoting, row, and column boundaries are inspected separately.
How should I validate CSV Deduplicator & Duplicate Finder output?+
header count, row width, quote escaping, and representative records opened in the target table
Does CSV Deduplicator & Duplicate Finder send or store input on a server?+
Tool input is processed in the active tab. Saving to the Workstation or transferring to another tool is a separate choice. Consider browser extensions and shared devices separately; the privacy page explains advertising and network connections.