File Conversion
XLSX to CSV Converter
Convert a single-sheet Excel spreadsheet to CSV. Workbooks with more than one sheet are refused, not silently truncated — use ODS, Markdown, HTML or PDF instead.
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How to convert XLSX to CSV
- 1
Upload the .xlsx workbook.
- 2
The sheets are counted first: a workbook with more than one is refused rather than truncated.
- 3
Download the .csv file for a single-sheet workbook.
Notes on this conversion
The sheets are counted before anything is written, and a workbook with more than one is refused rather than truncated — the refusal names the count it found. That is a deliberate ruling: a CSV holds exactly one table, so a six-sheet workbook would otherwise come back as its first sheet with the other five dropped and no warning, which is a partial file wearing a green tick. To keep every sheet, convert to ODS, Markdown, HTML or PDF, the four routes measured to carry them. A single-sheet workbook has nothing to lose and converts as expected, though formulas still arrive as the values they last calculated, because a CSV stores text.
Specifications
- Max file size
- Up to 100 MB per file
- Processing speed
- Typically under 10 seconds
- Quality
- Optimized for best output quality
- Batch support
- Multiple files supported
Your Files Are Safe
All files are encrypted with 256-bit TLS during transfer. Uploaded files are stored temporarily and automatically deleted about an hour after upload. We never access, read, or share your files.
Frequently Asked Questions
What happens to a workbook with more than one sheet?
It is refused, and the refusal names how many sheets it found. A CSV holds one table, so converting a six-sheet workbook would keep the first and drop five without saying so — a partial file wearing a green tick — and that outcome was judged worse than a clear failure.
What should I convert to instead, to keep every sheet?
ODS, Markdown, HTML or PDF. Those four are the routes measured to carry every sheet, and they are the ones the refusal message itself points to.
Do formulas survive?
No, and they cannot: a CSV stores text. Each formula cell arrives as the value it last calculated. Converting to ODS instead keeps them as formulas.
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