Why can't this tool produce an EPUB file directly in the browser?

EPUB files are ZIP archives that must contain OPF manifests, NCX navigation files, and conformant XHTML content. Reliably generating all of these from arbitrary spreadsheet data requires server-side tooling or a native app. This tool does the hard part — clean HTML export — and hands off the final packaging step to proven tools like Calibre.

Is my spreadsheet uploaded to a server?

No. SheetJS reads the file locally inside your browser. Your data never leaves your device at any point.

Which file formats are supported?

The tool accepts .xlsx (Excel 2007+), .xls (legacy Excel), and .csv files. Other formats such as .ods are not supported.

What does the downloaded HTML file contain?

A self-contained HTML file with all worksheets rendered as styled tables, a table of contents linking to each sheet, and inline CSS so it displays correctly in any browser or EPUB tool without external dependencies.

How do I convert the HTML to EPUB using Calibre?

Open Calibre, click "Add books" and select the downloaded HTML file, then click "Convert books". In the output format dropdown choose EPUB and click OK. Calibre handles the packaging automatically.

How do I convert using Pandoc (command line)?

Run: pandoc input.html -o output.epub. Pandoc will generate a valid EPUB 3 file from the HTML table structure. Add --metadata title="My Book" to set the e-book title.

Are charts and images from Excel included?

No. Only cell data (text and numbers) is exported. Embedded charts, shapes, and images are not part of the HTML output.

Is there a row or column limit?

There is no enforced limit, but very large sheets (thousands of rows) will produce a large HTML file and may take a few seconds to parse depending on your device.

Excel to EPUB Converter

Name: Excel to EPUB Converter
Availability: InStock
Author: Nham Vu

Upload an Excel or CSV file to view its data as a formatted table and download it as an HTML document ready for EPUB conversion.

Upload Spreadsheet

Click or drag a file here

.xlsx, .xls, .csv accepted

Notes

All sheets included in the HTML export
File never leaves your device
Open HTML in Calibre or Pandoc to finish EPUB

Finish the EPUB Conversion

Calibre (desktop, free)

Add the downloaded HTML via "Add books", select it, click "Convert books", choose EPUB as the output format, then click OK.

Pandoc (command line, free)

pandoc input.html -o output.epub

Sigil (EPUB editor, free)

Open Sigil, use File → Import → Import HTML to load the file, then save as .epub.

Sheet Preview

Upload a spreadsheet to preview it here

Supports .xlsx, .xls, .csv

Done!

Summary

Upload an Excel or CSV file to view its data as a formatted table and download it as an HTML document ready for EPUB conversion.

How it works

Click the upload zone or drag your .xlsx, .xls, or .csv file onto it.
SheetJS parses the workbook locally in your browser — no server upload.
Each worksheet is displayed as a formatted, scrollable table.
Switch between sheets using the sheet selector above the preview.
Click "Download HTML" to save a clean, self-contained HTML file.
Open the downloaded HTML in Calibre, Pandoc, or Sigil to produce an EPUB.

Use cases

Converting a reference spreadsheet into an e-book for offline reading.
Turning a product catalog or price list stored in Excel into an EPUB.
Archiving tabular research data as a portable e-book.
Preparing Excel content for import into Calibre or Sigil.
Sharing data-heavy spreadsheets as reader-friendly EPUB documents.
Generating a clean HTML snapshot of a CSV data export.
Previewing raw spreadsheet data before committing to a format conversion.
Creating accessible, reflowable e-book versions of financial tables.

Frequently Asked Questions

Last updated: 2026-06-25 · Reviewed by Nham Vu