# Excel to CSV / JSON - Convert xlsx to Markdown or HTML Online

> Free online Excel converter: open an xlsx, read every worksheet and export it as CSV, TSV, JSON, a Markdown table or HTML. Date serial numbers become dates.

- URL: https://qilingtools.com/en/excel-convert
- Category: Productivity (https://qilingtools.com/en/office)
- Tags: [Markdown](https://qilingtools.com/en/tags/markdown), [Converters](https://qilingtools.com/en/tags/convert), [Documents](https://qilingtools.com/en/tags/document), [Productivity](https://qilingtools.com/en/tags/office)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

When a spreadsheet has to feed a script, go into a document or land in a Git repository, what you actually need is the plain data. This tool parses xlsx right in the browser: pick a file, look through each worksheet, then choose an output format. The spreadsheet never leaves your machine, so company data is safe here.

## How to use

1. Choose an .xlsx / .xlsm file
2. Switch worksheets with the tabs above the preview
3. Pick CSV / TSV / JSON / Markdown / HTML, then copy or download

## Features

- Preview every worksheet, or download them all as one ZIP
- Dates are resolved from the cell format, so no 42507 serial numbers in the output
- CSV carries a BOM by default, so Excel opens non-ASCII text correctly
- JSON can use the first row as field names; Markdown and HTML paste straight into docs

## FAQ

### Can it open the old .xls format?

No. .xls is the Excel 97-2003 binary format, which has nothing in common with .xlsx. Open it in Excel, WPS or LibreOffice, save as .xlsx and come back.

### What happens to formulas?

You get the value the formula produced. Excel stores the computed result alongside the formula, so =SUM(A1:A9) exports as the number. Files written by scripts sometimes carry no cached result; those cells fall back to the formula text rather than exporting a blank.

### Why did a percentage become 0.123?

The cell really holds 0.123 and 12.3% is only a display format. Exporting the stored value keeps the numbers usable in code; add percent signs afterwards if you need them.

### How are merged cells handled?

They are flattened using the top-left value: the first cell keeps the content and the rest are empty, so the grid still matches CSV rows and columns. The preview tells you how many merged ranges there were.

### Is there a row limit?

No. Parsing walks the XML in order, so sheets with tens of thousands of rows work; only the preview is capped at the first 30 rows and 12 columns to keep the page responsive.

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