Skip to main content

Convert · browser workspace

Merge Excel Sheets into One - Combine Tabs

Convert messy .xlsx files into clean, machine-readable CSVs. Process locally in your browser with HappyCSV.

Preparing your private workspace…
How to use this tool

Quick start

Built for turning excel workbooks into portable csv files for analysis, imports, or automation.

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

Output: A UTF-8 CSV that is ready for spreadsheets, databases, and scripts.

  1. 1Upload an .xlsx or .xls workbook.
  2. 2Choose a sheet or export mode when prompted.
  3. 3Download the CSV and continue in your destination tool.

How to Excel to CSV

  1. 1Upload an .xlsx or .xls workbook.
  2. 2Choose a sheet or export mode when prompted.
  3. 3Download the CSV and continue in your destination tool.

Why Use This Tool?

  • ✓Convert messy .xlsx files into clean, machine-readable CSVs.
  • ✓A UTF-8 CSV that is ready for spreadsheets, databases, and scripts.
  • ✓Files are processed locally in this browser.
  • ✓Keep the source file and review the result before importing it elsewhere.

Frequently Asked Questions

What does this tool support?

A UTF-8 CSV that is ready for spreadsheets, databases, and scripts.

What are the processing limits?

Up to 100 MB per CSV, 20 MB per complex document; 250,000 rows, 1,000 columns, 2 million cells, and 128 MB output. Jobs stop after two minutes. Large files may need splitting.

Are my files uploaded?

No. File processing stays in your browser. Files are not automatically saved for the next visit.

Can I process multiple files?

Yes, up to 50 files and 500 MB combined, subject to the per-file and processing limits. Batch results download as a ZIP; errors identify any omitted files.