XLSX to CSV converter
Convert XLSX files to CSV with TLS uploads and automatic deletion. Comma-separated plain-text tabular data.
Drop a XLSX file, or click to browse
Converts to CSV · runs live, right now
How it works
Drop your file
Drag a XLSX file in, or click to browse. No account needed to try it.
We convert it
Secure upload, converted to CSV in our sheet pipeline.
Download the result
Grab your CSV file immediately, or find it later in your dashboard.
Why convert XLSX to CSV?
CSV is a plain, uncompressed format — the file will likely be larger than the XLSX original, in exchange for maximum compatibility. The main reason to convert XLSX to CSV is compatibility: CSV opens cleanly in Excel, Google Sheets and most spreadsheet tools, while XLSX doesn't always. If you're sharing a file with someone else, sending it to a tool that expects a specific format, or archiving it for the long term, CSV is usually the safer target.
Format comparison
| XLSX | CSV | |
|---|---|---|
| Extension | .xlsx | .csv |
| MIME type | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet | text/csv |
| Compression | lossless compression | no compression scheme of its own |
| Category | spreadsheet | spreadsheet |
Common reasons to convert XLSX to CSV
- Importing data into a tool or script that only reads CSV
- Sharing a spreadsheet with someone who doesn't have XLSX's original app
- Maximizing compatibility with older or stricter tools that expect an uncompressed CSV file
What actually happens to your file
SheetJS reads the workbook and writes CSV from the first sheet only. Extra sheets are dropped. Formulas export as their last stored values, not the formula text, and cell formatting, charts, and merged-cell layout don't survive — CSV is a grid of values, not a spreadsheet.
Your file, handled carefully
Uploads use TLS in transit and AES-256 SSE-S3 at rest in production (when the production S3 credential gate is enabled), are processed in an isolated job, and deleted on the schedule you choose — as fast as immediately. We don't index, search, or share files between accounts. Read the full security model →
Frequently asked questions
Is converting XLSX to CSV free?
Yes — the Free plan includes 50 conversions every month, including XLSX to CSV. Paid plans raise that limit.
Will I lose quality converting XLSX to CSV?
CSV is comma-separated plain-text tabular data. We use the highest-quality encoder settings by default so visual or data loss is minimized.
Do you keep a copy of my file?
Files are deleted automatically based on your plan's retention options. Free accounts can keep results for 1h or 24h; Pro and above add options such as delete-immediately and 7 days.
What is XLSX?
Microsoft Excel's XML-based spreadsheet format.
What happens if a conversion fails?
You get a clear error message and the job is marked failed in your history — we never silently drop a file. Retry is one click. Monthly quotas count attempts (including failures) because processing starts as soon as the job is created.