Step 1 / source
Choose the source
Drop one file here
Choose the one xlsx worksheet you want to turn into github-style markdown table.
Checking publication status...LOCAL TABLE CONVERTER / EXCEL TO MARKDOWN TABLE
Excel to Markdown Table
Export one bounded XLSX worksheet as an escaped Markdown table using stored cell values and the first row as headers.
Processed in this browserOne unencrypted .xlsx file up to 15 MB and 50 worksheets. The selected sheet supports one header row plus 50,000 records, 200 columns, 1,000,000 cells, and 20 MB output.
XLSX - one Markdown table
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One unencrypted .xlsx file up to 15 MB and 50 worksheets. The selected sheet supports one header row plus 50,000 records, 200 columns, 1,000,000 cells, and 20 MB output.
Plain-language method
How Excel to Markdown Table works
The browser reads stored values from one worksheet without recalculating formulas, uses row one as normalized headers, skips completely blank rows, escapes Markdown and HTML-sensitive cell text, and writes one table.
- 01Choose a valid source
Use a compact review worksheet whose first row names columns. Hidden sheets still count in workbook tab order.
- 02Review the conversion choices
Alignment changes Markdown layout markers only. Formula cells contribute their saved result when available.
- 03Inspect the separate result
The result ends in _nirmion_tools.md. Workbook styles, formulas, comments, charts, images, and merged-cell layout are not included.
Useful when
Practical jobs this tool handles
- Publish an approved worksheet excerpt in documentation.
- Create a README table from a review sheet.
- Share a compact value snapshot without a workbook.
Before converting
Check the source and destination rules
- Verify worksheet number and headers.
- Recalculate and save formulas first.
- Review width and readability in Markdown.
Know the boundary
Know what the destination format cannot keep
Markdown is a plain-text table, not an Excel renderer. Only stored cell values survive, and large worksheets may produce impractical documentation.
Quick answers
Questions before you convert
The conversion contract is deliberately explicit.
Are formulas executed?
No. Only saved results are read.
Are colours and widths copied?
No. Markdown has no workbook styling model.
Can several sheets be combined?
No. One explicit worksheet keeps the table contract reviewable.