What is an XLSX file?

XLSX is the default spreadsheet format for Microsoft Excel 2007 and newer, based on the Open XML standard.

Are merged cells supported?

Merged cells are expanded into individual cells with the content placed in the first cell.

Convert XLSX to Markdown tables online. Ideal for ChatGPT, Claude, and LLM data analysis. Clean GFM tables from Excel 2007+ files. Free, instant.

table_chart

XLSX

Max file size: 20MB ·

grid_on

Each sheet is converted as a separate section with its own header and table.

functions

Formulas are evaluated and their computed results appear in the Markdown output.

format_align_left

Cell alignment is preserved using GFM table alignment syntax.

Feature	mdstill	Standard Tools
Privacy	Files deleted after processing	Server-side storage
Table Fidelity	High-precision GFM	Broken text blocks
Output Quality	Semantic Markdown	Raw text dumps
Max File Size	20 MB	Usually 5-10 MB