Tiny Toolkit

CSV to Excel Converter

Convert a CSV file or pasted CSV data to a downloadable Excel (.xlsx) spreadsheet in your browser. Column headers from the first row are preserved as bold header cells. Useful when you need to hand off CSV data to someone who works in Excel, or when a system requires .xlsx rather than plain CSV.

All processing happens in your browser. No data is sent to any server.

Frequently Asked Questions

How do I use this tool?
Paste your CSV data into the text area, or drag and drop a .csv file onto the box. A preview table appears showing the first 10 rows. Click Convert to Excel to download the spreadsheet as an .xlsx file.
What if my CSV has quoted fields that contain commas?
The tool parses RFC 4180-style CSV, including quoted fields that contain commas, double quotes, and newlines. These are handled correctly in both the preview table and the Excel output.
What is the output filename?
The downloaded file is named export.xlsx. You can rename it after downloading.
Is there a row or column limit?
Excel supports up to 1,048,576 rows and 16,384 columns. In practice, very large CSV files may take a moment to convert, but there is no artificial limit imposed by this tool.

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