Convert Excel workbooks to interactive web pages — without leaving Excel.

SpreadsheetConverter v12 is a Microsoft Excel add-in that turns your spreadsheet — formulas, formatting, charts, and all — into a self-contained HTML page that calculates in the browser.

This is the public beta. The add-in runs on your spreadsheet, never sends it to a server (apart from the conversion request), and produces a static HTML bundle you can host anywhere.

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What you get

• Formulas that calculate. SUM, IF, VLOOKUP, plus 380+ Excel functions compile to JavaScript that runs in the visitor's browser.
• Cell formatting preserved. Number formats, colours, borders, conditional formatting, merged cells.
• Widgets. Drop-downs, sliders, checkboxes, and date pickers wired to your formulas.
• Self-contained output. Your spreadsheet becomes a bundle of HTML, JavaScript, and assets — download it as a zip and host it on any web server, S3, or GitHub Pages, or send the zip by email.

What's in the beta

The v12 beta has the full feature set of the long-running v11 product, rebuilt on a new .xlsx-based engine. Use the beta when you want:

• To try the new .xlsx-based conversion pipeline.
• The full SpreadsheetConverter feature set with no local installation needed — it runs as a Microsoft 365 add-in.
• To report a bug or limitation before v12 ships to AppSource.

The v11 release at spreadsheetconverter.com remains the established, generally-available product; v12 is still in public beta.

Get started

Open Excel on your desktop, click Add-ins on the Home ribbon, search for spreadsheetconverter, and click Add. A Convert to Web button appears on the ribbon. Full steps are on the install page.