Converting XLSX to HTML gives you the same content in a different container. It runs in your browser: nothing is uploaded, there is no queue and no size limit.
What changes when you convert XLSX to HTML
- Nothing in your content changes: only the container does. This is a fast, exact conversion.
When to convert, and when not to
Convert to HTML for publishing on the web. A web page.
Keep XLSX for spreadsheets people will edit. Excel's workbook: several sheets, formulas, formatting.
How to convert XLSX to HTML
- Drop your XLSX file on the converter above, or click to choose. Several at once is fine.
- Check the options if you need them: sheet name (blank = first).
- Click Convert, then Download. Nothing was sent anywhere, your browser did the work.
Questions
Is my XLSX file uploaded?
No. The conversion runs in your browser with WebAssembly. There is no upload endpoint on this site. You can open your browser's Network tab, or go offline after the page loads, and it still works.
Is there a file size limit?
No fixed one. The limit is your device's memory: a large data file on a phone is slower than on a laptop, but nothing is rejected for being big.
Is it free?
Yes, without an account, without a daily cap and without a watermark. Your device does the computing, so there is no server bill to pass on.
Will the quality drop?
No. HTML is lossless: the data content is stored exactly.
Can I convert several files at once?
Yes. Drop them all; each is converted in turn and you can download them one by one or as a single ZIP.
Which engine does the conversion?
Data engine (SheetJS, js-yaml, fast-xml-parser, smol-toml), compiled to WebAssembly and running in your browser. First use downloads about 0.9 MB, cached afterwards.