Convert CSV Files to Excel XLSX via API
Convert CSV files to Microsoft Excel XLSX spreadsheets via REST API. Upload your CSV file as multipart/form-data and receive a formatted Excel workbook in response. Perfect for report generation and data export pipelines.
# Convert CSV file to Excel XLSX
curl -X POST \
https://api.convertfilefast.com/v2/convert/csv-to-xlsx \
-H "Authorization: Bearer YOUR_API_KEY" \
-F "file=@data.csv" \
--output output.xlsx
# HTTP 200 OK — Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheetAdvantages
Why use our API?
Complete and reliable solution for integration in any tech stack.
Excel-Ready Output
Receive a properly formatted XLSX file that opens directly in Microsoft Excel, Google Sheets, and LibreOffice Calc.
Simple Upload
Upload your CSV as multipart/form-data and receive the Excel XLSX binary in response. No configuration needed.
Column Formatting
CSV columns are mapped to Excel cells with automatic column width adjustment and header formatting.
Report Generation
Use in report generation pipelines to deliver data as Excel files to clients, stakeholders, and dashboards.
n8n & Automation
Convert CSV exports from databases or APIs to Excel in n8n workflows and send via email or save to Drive.
Zero Storage
CSV files are converted in memory and deleted immediately. Your data is never stored on our servers.
Start Converting CSV to Excel
Get your API key and convert CSV files to Excel XLSX in seconds. Free plan includes 10 conversions per month.
No credit card. 10 free conversions on Free plan.