Merge Excel Files
Combine multiple Excel (.xlsx, .xls) and CSV files into one workbook. Union merge handles different column schemas automatically.
Use tool →Split CSV
Split large CSV files into smaller chunks by row count. Downloads as a ZIP archive with numbered parts ready to use.
Use tool →Convert Excel to CSV
Convert .xlsx or .xls files to CSV. Multi-sheet workbooks export as a ZIP with one CSV per sheet, preserving all data.
Use tool →CSV to JSON
Convert CSV files to JSON array format. Each row becomes an object with column headers as keys. Perfect for APIs and developers.
Use tool →Remove Duplicates
Remove duplicate rows from CSV or Excel files. Tells you exactly how many rows were removed before downloading the clean file.
Use tool →Transpose CSV
Flip rows and columns in a CSV file. Instantly transpose your data matrix — useful for pivot-style transformations.
Use tool →🔒 100% Private. All file processing runs entirely in your browser using JavaScript. Your files never leave your device.