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Supports .xlsx, .xls, .csv files. Parallel processing merges up to 4 files simultaneously for lightning speed.
Optimized for large files - processes up to 100MB in seconds
Data Preview
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- Advanced multi-row header detection (supports merged cells in headers)
- Preserves original column positioning and alignment exactly as in input files
- Intelligent column matching across multiple sheets
- Merged header cells in input files remain merged in output
- Missing values under any column are filled with zero for consistency
- Dark blue headers only - no background colors in data rows
- Blank columns are automatically removed from output
- The preview reflects the exact structure of the final merged Excel file
- Parallel Processing: Processes up to 4 files simultaneously
- Optimized Algorithms: Uses pandas for fast data handling
- Memory Efficient: Processes files in chunks to handle large datasets
- Fast Merging: Optimized merge algorithms for speed
- Real-time Processing: Shows progress during file processing
- Background Cleanup: Automatically cleans up temporary files
Performance Tips
For best performance: 1) Keep files under 10MB each, 2) Limit to 20 files per batch, 3) Close other applications during large merges.
- For best results, ensure your Excel files have consistent header structures
- The tool can handle up to 100MB of Excel data per batch
- Complex formatting and formulas may not be preserved in the merged output
- Large files may take longer to process - please be patient
- If you encounter issues, try splitting very large files into smaller ones
- Always verify the merged data matches your expectations before use
- Keep a backup of your original files before processing
- Multi-row headers are fully supported and preserved
Frequently Asked Questions (FAQs)
1. What types of Excel files can I merge using this tool?
You can merge any Excel files such as attendance sheets, salary sheets, registers, bank statements, MIS reports, or custom internal reports. The tool is designed to handle different formats, column orders, and structures, not just identical templates.
2. Do all Excel files need to have the same columns or format?
No. Files do not need to follow the same format. The tool intelligently detects headers, aligns similar columns, and merges data logically. However, extremely unstructured files may require manual review after merging.
3. How does the tool handle different or multi-row headers?
The tool automatically scans the file to identify the actual data headers, even if: • There are title rows • Headers span multiple rows • Cells are merged Non-data rows like titles or notes are ignored or handled separately during the merge.
4. Will the original data in my Excel files be changed?
No. Your uploaded files are never modified. The tool only creates a new merged Excel file, keeping all original data intact.
5. What happens if some columns exist in one file but not in others?
The tool creates a combined structure that includes all detected columns. If a column is missing in a particular file, the corresponding cells in the merged output will remain blank for those rows.
6. Is this tool suitable for large or professional datasets?
Yes. The tool is built for real-world business data, including multi-sheet files, varying formats, and large datasets. Still, users should always review the merged output before using it for reporting or compliance purposes.