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Merge Excel Files - Combine XLSX Workbooks

Merge multiple Excel (.xlsx) files into one master file. Combine workbooks and sheets in your browser. Files stay on your device.

Quick start

Built for upload multiple files and stack them into one large master file.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A new file or report produced locally in your browser.

  1. 1Choose a supported file or use sample data when available.
  2. 2Set the options shown for this workflow.
  3. 3Process the file locally, inspect the result, and download a new copy.
Preparing your private workspace…

How to Merge Files

  1. 1Select multiple Excel (.xlsx) files to upload
  2. 2Tool automatically extracts data from the first sheet of each file
  3. 3Download one combined master CSV file

Why Use This Tool?

  • ✓Combine Workbooks - Merge up to 50 Excel files at once
  • ✓Auto-Header Matching - Aligns columns automatically
  • ✓No Copy-Pasting - Save hours of manual work
  • ✓processed locally in your browser - Financial data never leaves your device
  • ✓Works on Mac & Windows - Browser-based compatibility

Frequently Asked Questions

Can I merge Excel and CSV files together?

Yes. You can mix .xlsx and .csv files in the same batch. The tool handles both formats correctly.

Does it merge all sheets?

Currently, it merges the *first* sheet of each Excel workbook. To merge all sheets from one workbook, use the "Excel to CSV" tool first.

Do columns need to be in the same order?

No. We match columns by name, so even if "Email" is column A in one file and column Z in another, they will align correctly.