CSV to XLS Converter
Convert CSV data into the legacy XLS spreadsheet format directly in your browser.
100% Client-Side Processing
All conversion happens in your browser. Your files are not uploaded to a server.
Workbook options
Line endings
Table of Contents
Learn more
What is this tool?
This tool reads a CSV file and converts it to XLS directly in your browser.
It helps you move from a plain delimited file into a structure that is easier to use in APIs, spreadsheets, or system-to-system workflows.
How it works
- Upload the CSV file.
- Confirm whether the first row contains headers and review the detected table preview.
- Generate the output and download the converted file.
Conversion settings
Delimiter detection
The tool automatically detects the most likely CSV separator so rows and columns are interpreted correctly.
Headers
If your CSV includes a header row, those names are used as JSON keys or as spreadsheet column headers.
Sheet name
You can choose the output worksheet name before downloading the generated workbook.
Common use cases
- Turning CSV exports into a format that is easier to review or import somewhere else.
- Preparing table data for scripts, integrations, or manual spreadsheet work.
- Normalizing files from third parties before using them in another workflow.
Frequently asked questions
The tool tries to detect that automatically and shows the interpreted structure in the preview.
No. Conversion focuses on the table data, not spreadsheet styling or advanced cell types.
Yes. The CSV is read and converted entirely in your browser.