CSV and Excel Merger
Merge multiple CSV and Excel spreadsheets into one table by aligning matching column headers. Export clean data to XLSX or CSV directly in your browser.
Excel or CSV · up to 20 files · you can select several at once
Tips
- Columns align automatically based on exact header names even if their order differs across files.
- Enable the source file column to track which document contributed each row of data.
- If products overlap across multiple files, remove duplicate entries afterward using a row deduplicator.
How to use it
- 1 Select or drag and drop your CSV and Excel files into the merger.
- 2 Review the row and column counts for each uploaded file and remove any unintended documents.
- 3 Choose your desired output format as either Excel spreadsheet or CSV file.
- 4 Click the merge button to combine the datasets and save the file to your device.
What you should know
E-commerce platforms, sales channels, and accounting software regularly export data as separate CSV or Excel spreadsheets. Combining these files manually by copying and pasting often corrupts records because column orders differ between exports. For instance, exporting product catalogs from independent storefronts like Shopify or regional platforms like Trendyol, the largest marketplace in Turkey, yields varying column structures. If one export lists prices in the third column and another places SKU codes there, blind pasting misaligns values. Proper header-based alignment ensures identical fields stack together regardless of position.
This tool reads up to twenty CSV or Excel files and merges their rows by exact header text. Columns present in only some files leave empty cells for rows where that field did not exist, preventing misaligned data. You can inspect row and column counts per file before merging, append an optional source filename column to track origins, and export the unified dataset as an XLSX or CSV file. All parsing runs locally in your browser memory without uploading raw records to external servers.
Frequently asked questions
What happens if column header names differ across files?
The merger matches columns by exact name. If one sheet uses Price and another uses Sale Price, they will become two separate columns; rename matching headers identically before merging or consolidate them afterward.
How does the tool handle multiple worksheets in an Excel workbook?
The tool processes only the first active worksheet in each uploaded Excel file. To merge multiple sheets from a single workbook, save each tab as an individual spreadsheet before adding them.
How are duplicate rows or products handled?
All matching rows are retained in the merged file as separate entries. If you have overlapping inventory or customer lists across files, run the exported file through a duplicate line remover to isolate unique items.
Guides
Articles and format references related to this tool.
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