XLSX / CSV Converter
Convert between Excel (XLSX) and CSV formats instantly
Drop an .xlsx file here or click to browse
About XLSX / CSV Converter
Convert Excel XLSX files to CSV or paste CSV to download as XLSX. Runs entirely in your browser — no files are ever uploaded to a server.
- Converts Excel XLSX files to CSV and back
- Sheet selector for multi-sheet XLSX files
- Live data preview table before downloading
- Paste CSV text directly without uploading a file
- All conversion done locally without server upload
Everything runs in your browser — your data never leaves your device.
Share:
How to Use XLSX / CSV Converter
- Choose a conversion direction: XLSX to CSV or CSV to XLSX
- Upload your file or paste CSV text in the input area
- Preview the converted data in the table below
- Click Download to save the converted file
Frequently Asked Questions
Is my data sent to a server?
No. All conversion happens locally in your browser using JavaScript. Your files never leave your device.
Are multiple sheets supported?
When converting XLSX to CSV, you can select which sheet to convert. CSV to XLSX creates a single sheet.
What is the file size limit?
There is no hard limit, but very large files (over 50MB) may be slow to process in the browser.
