Convert XLSX to CSV

with our secure online converter

Drag and drop your XLSX files here or click to upload.
You can specify multiple input files.

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Input file

Our API accepts one or multiple .XLSX files as input. This file extension belongs to Microsoft Excel.

Max file size for web uploads: 50 GB

Output file

The API will return a ZIP archive of .CSV files, one for each worksheet in the uploaded .XLSX files. The CSV files comply with our CSV specification.

How long does it take?

The conversion process takes between 15 seconds and multiple minutes. It depends on the size of the database.


Already 2,000+ satisfied customers with over 700,000+ databases successfully converted.

Conversion methods

Download the RebaseData client Java tool . To convert your database using RebaseData, run the following command:

java -jar client-0.0.5.jar convert --output-format=csv file.xlsx output-dir/

Replace file.xlsx with the path to the .XLSX file you want to convert.
The file will contain a CSV file, one for each worksheet in the uploaded .XLSX files. If something went wrong, contains the error message.

curl -F 'files[]=@file.xlsx' '' -o

Why use RebaseData?

  • Strong security.
  • Convert online without installing Microsoft Excel.
  • Works with Windows, Mac and Linux.
  • Use an API to convert your databases.
  • Professional support.


  • We don't guarantee for the success or correctness of the conversion
  • You are only allowed to convert your own database files
  • By using RebaseData, you agree to our general terms