Convert Excel to HTML Table

Yes. SheetJS parses CSV just as it does Excel – the same options (first row as header, skip empty rows, borders, striped, Bootstrap, responsive wrapper, row limit) all apply. The file extension drives the parser choice; everything downstream is identical.

No. All parsing and HTML generation runs in your browser. The only network call is the one-time fetch of the SheetJS library from a CDN – once cached, the tool runs fully offline. Your spreadsheet bytes never leave the device.

SheetJS handles Excel 2007+ (.xlsx, the modern Office Open XML format) and legacy .xls (the BIFF8 binary format from 1997-2003), plus .csv. Pivot tables, charts, conditional formatting, and macros are stripped – only cell values survive. Formulas are evaluated to their cached numeric / text result; the formula syntax itself isn’t included.

Two paths. With “Bootstrap classes” off (default) the tool emits an inline <style> block with bordered / striped CSS scoped to the table or to your custom Table ID – paste-and-done. With Bootstrap on, the tool emits class="table table-bordered table-striped" and assumes you’ve already linked Bootstrap CSS in your page (the downloaded standalone HTML file includes the Bootstrap CDN link automatically).

Hard cap 5 MB at upload time. Practical limit is whatever your browser can hold in memory – SheetJS reads the whole workbook into a JS object, so a 5 MB .xlsx with 100 K cells can use 50+ MB of RAM during parsing. Use the “Row limit” option to preview just the first N rows of huge sheets.

Cell values are preserved exactly. Cell formatting (colours, fonts, alignment, conditional formatting, merged cells) is dropped – the output is plain semantic HTML. If you need formatting, post-process with CSS, or use a CSS framework like Bootstrap. The tool prefers the formatted text (cell.w) over the raw value (cell.v) when present, so dates render as “2025-06-15” rather than the Excel serial number “45823”.

Yes. The five HTML-sensitive characters (&, <, >, ", ') are HTML-entity-escaped in every cell value before insertion into the output. So a cell containing <script>alert(1)</script> emits <script>alert(1)</script> – rendered as literal text, not executed.

Yes – free, unlimited, no signup, no watermark. The generated HTML is yours to use anywhere. Attribution to is appreciated but not required.