Convert CSV to XLSX.
Turn a CSV into a proper Excel .xlsx workbook, ready to open in Excel, Google Sheets or Numbers.
How it works
- 01
Upload your CSV
Drop a file or pick one from your device. Private by default.
- 02
Convert faithfully
CSV becomes XLSX with a free, open-source engine — values preserved exactly, no paid API in the loop.
- 03
Download or hand off
Grab your XLSX, or open it in TranscriptAI to do more.
Values preserved exactly — no mangled IDs or zeros
Multi-sheet workbooks fully supported
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Free and open-source engine
Direct handoff to TranscriptAI
Your file is ready. Want to do more with it?
Open this file in TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items — automatically.
Common questions
Is it free?+
Yes — convert CSV to XLSX free. Paid plans add larger files, batch and priority.
Is my data private?+
Uploads go to a private bucket, are converted, and auto-delete after 1 hour. Files never touch a third-party converter.
Are leading zeros and IDs kept?+
Yes — cells are read as text, so codes like 007 and long IDs are preserved exactly, never converted to numbers.
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