How to use
- 1
Upload your Master File (File A) and Comparison File (File B).
- 2
Select the Unique Key column (e.g., ID, Email) for both files.
- 3
Click "Compare Now" to analyze the data.
- 4
View matches, missing entries, and new records in the dashboard.
- 5
Export the Missing Data report to a new Excel file.
Key Features
- Find Matches, Missing (in A not B), and New (in B not A) records
- Fuzzy matching (ignores whitespace and case sensitivity)
- Optimized for large files (10k+ rows)
- Privacy-focused: All processing happens in your browser
- Export detailed reports to Excel
Frequently Asked Questions
Is my data secure?
Yes. All file processing happens locally in your web browser. No files are ever uploaded to a server.
Does it support fuzzy matching?
Yes, the tool automatically trims whitespace and ignores case sensitivity when comparing keys.