Validate Supplemental Data Sources instantly. Compare CSV files with up to 100,000 rows, find duplicates, track field changes, and ensure perfect data matching before Qualtrics import.
Optimized processing with advanced progress tracking, memory-efficient algorithms, and version-to-version field change detection.
Your CSV files are processed entirely in your browser. No uploads, no storage, no data retention. We literally cannot access your files.
Your files contain a significant amount of data. Processing will be optimized but may take longer.
💡 Tip: Ensure you have sufficient RAM and consider closing other browser tabs for optimal performance.
Choose fields that uniquely identify records (like Email, ID, Participant_ID, etc.)
