PDF Mikata

Merge Several Excel Files into One CSV

To gather scattered Excel files into one for totals.

Your files are never uploaded. Everything is processed on this device.

  1. 1Choose Excel files
  2. 2Set how to merge
  3. 3Save as CSV
Done

🔒 Your files are never sent to an external server. Everything is processed safely inside this browser.

How to use

  1. Tap "Choose Excel files" and select all the .xlsx files to combine.
  2. Choose which sheets to use and how to treat the header.
  3. Tap "Merge and save as CSV" and save.

How it works

  • Data from several Excel files is stacked into one CSV, top to bottom.
  • This suits files with the same layout, such as monthly reports.
  • Adding "source file" and "sheet" columns shows where each row came from.

Notes

  • Only the stored cell values are used. Formatting and formulas are not included.
  • Excel files with different column layouts should be matched first.
  • Old .xls and password-protected files cannot be opened.

FAQ

Are my files uploaded anywhere?

No. Everything is processed inside the browser on your device.

Can I open the result in Excel?

Yes. It is saved as UTF-8 with a BOM so that Excel does not garble it.

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Guides for this tool

How to Merge Several Excel Files into One (as CSV, Works on a Phone)Combining Monthly Excel Files into a Yearly DatasetCombining All Sheets of One Excel FileKeeping the Header from RepeatingMerging Excel Files with Different ColumnsWhat to Do When Merging Fails or Looks GarbledMerging Excel Files Without Uploading Them

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