Comparing two CSV files manually is painful. Thousands of rows, multiple columns, no easy way to see what changed, what is missing, or what does not match. Pirai AI's free CSV Comparator finds every difference, duplicate, and mismatch between two CSV files : handling up to 100,000 rows, entirely in your browser. No file uploads. No data leaves your device.
What the CSV Comparator Does
| Feature | Detail |
|---|---|
| File size | Up to 100,000 rows per file |
| Difference detection | Finds rows that exist in one file but not the other |
| Duplicate detection | Identifies duplicate rows within each file |
| Field analysis | Compares column structure between files |
| Export | Export detailed difference reports |
| Privacy | Runs entirely in your browser : no data uploaded or stored |
How to Compare Two CSV Files
- 1Open the CSV ComparatorGo to piraiai.com/pirai-csv-comparator (web version) or install the Chrome extension for use directly in your browser.
- 2Load your two CSV filesSelect or drag and drop your first CSV file into the left panel and your second CSV file into the right panel. Files are processed locally : nothing is uploaded.
- 3Review the comparison resultsThe tool shows differences side by side: rows only in File A, rows only in File B, duplicate rows, and field structure differences between the two files.
- 4Export the difference reportDownload a detailed difference report as CSV for further analysis or to share with your team.
Common Use Cases
| Use Case | What to Compare |
|---|---|
| Qualtrics survey validation | Compare exported Qualtrics response CSVs before and after data cleaning |
| Platform migration check | Compare question lists from two platforms to verify full migration |
| Data deduplication | Find and remove duplicate respondent records across two exports |
| Workflow task mapping | Compare Dev vs Prod Qualtrics workflow task field mappings (exported with Pirai AI tools) |
| Contact list validation | Compare XM Directory contact exports to find additions and removals |
| Survey codebook audit | Compare two versions of a survey codebook or data dictionary |
Privacy-first design
The CSV Comparator runs entirely in your browser using client-side JavaScript. No CSV data is uploaded to any server. No data is stored or logged. This makes it safe for research data, clinical data, and any sensitive information you need to compare.
Compare your CSV files free. Up to 100,000 rows. No upload required.
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Get Started
Open the CSV Comparator web tool or install the Chrome extension. Both are free with no account required.
For the full Pirai AI free tools suite, see the Qualtrics Toolkit. For Qualtrics workflow task field mapping tools, see the Dashboard Field Mapper.