Excel XLSX to HTML converter

XLSX to HTML writes table markup only, so Excel data becomes `<thead>` and `<tbody>` rows rather than a styled replica of the workbook.

Converted with Table engine · nothing stored
Free: 5 conversions a day · 5 MB each
Higher limits →

From real runs

What you get — and what changes

Element	Result	What happens
Table structure	Changed	The output was a single `<table>` with one header row and body rows, not a full HTML document with workbook chrome.
First sheet default	Changed	The API converted the Orders sheet and warned that the Lookups sheet was exposed internally but not written to the single-table format.
Merged headers	Changed	A merged report title became `<th>Q3 Orders</th>` followed by synthetic header cells named column_2 through column_5.
Escaped text	Kept	Cell text was escaped for HTML output, so angle brackets and ampersands are protected when present in worksheet data.
Dates and percentages	Changed	The tested date cells became ISO strings and the percentage cell kept its raw numeric value, matching tabular extraction rather than display formatting.
Formula results	Changed	Formula cells are represented by cached values, and the HTML output does not contain spreadsheet formulas or recalculation logic.
Excel styling	Lost	Cell colors, borders, number formats, column widths, charts, filters, comments, and frozen panes were not written into the HTML table.

Table structure Changed
The output was a single <table> with one header row and body rows, not a full HTML document with workbook chrome.
First sheet default Changed
The API converted the Orders sheet and warned that the Lookups sheet was exposed internally but not written to the single-table format.
Merged headers Changed
A merged report title became <th>Q3 Orders</th> followed by synthetic header cells named column_2 through column_5.
Escaped text Kept
Cell text was escaped for HTML output, so angle brackets and ampersands are protected when present in worksheet data.
Dates and percentages Changed
The tested date cells became ISO strings and the percentage cell kept its raw numeric value, matching tabular extraction rather than display formatting.
Formula results Changed
Formula cells are represented by cached values, and the HTML output does not contain spreadsheet formulas or recalculation logic.
Excel styling Lost
Cell colors, borders, number formats, column widths, charts, filters, comments, and frozen panes were not written into the HTML table.

Sample conversions

Orders worksheet

Input: 17,714-byte XLSX with a merged Q3 Orders heading, two order rows, ISO-like date cells, and a second Lookups sheet.
Output: 446-byte HTML started <table><thead><tr><th>Q3 Orders</th><th>column_2</th> and included <td>2026-09-10T00:00:00.000Z</td><td>0.375</td>.

Apostrophe in customer name

Input: Orders sheet row contained customer Bo O'Connor and total 99.99.
Output: The HTML body kept the apostrophe as text inside <td>Bo O'Connor</td> and did not add workbook-specific styles or classes.

A real Excel XLSX → HTML run

We converted our Excel XLSX sample (17 KB) with Table engine on 2026-09-11. It took 1 ms and produced a 517 B HTML file, 97% smaller than the input. The engine raised 2 warnings, listed below.

Input · sample.xlsx · 17 KB

Workbook with 2 sheets (Pipeline, Notes); first sheet 5 rows, 25 cells, 0 formulas

Sheets: 2
Sheet names: Pipeline, Notes
Rows: 5
Cells: 25
Formulas: 0
frozenHeader: no

Output · sample.html · 517 B

HTML fragment with 0 headings, 0 paragraphs, 1 table, 0 links, 0 images

Headings: 0
Paragraphs: 0
Tables: 1
Links: 0
Images: 0
Standalone document: no

Workbook contains multiple sheets; each sheet was exposed as its own IR table.
Only the first table was written to this single-table format.

First lines of the output

html

<table><thead><tr><th>company</th><th>stage</th><th>arr</th><th>owner</th><th>close_date</th></tr></thead><tbody><tr><td>Northwind Traders</td><td>Proposal</td><td>48000</td><td>R. Ayers</td><td>2026-10-14</td></tr><tr><td>Contoso Ltd</td><td>Negotiation</td><td>120000</td><td>P. Ng</td><td>2026-09-30</td></tr><tr><td>Fabrikam</td><td>Qualified</td><td>22500</td><td>R. Ayers</td><td>2026-11-02</td></tr><tr><td>Tailspin Toys</td><td>Won</td><td>64000</td><td>M. Okafor</td><td>2026-09-03</td></tr></tbody></table>

Options and when to change them

sheet: Pick the data tab before writing HTML from a workbook with multiple worksheets.
headerRowIndex: Use it when a title block appears above the real column names and should not become <th> text.
dateHandling: Keep date mode for machine-readable ISO text, or string mode when the worksheet's visible date wording matters.

Do it yourself

Python pandas

bash

python - <<'PY'
import pandas as pd
df = pd.read_excel("in.xlsx", sheet_name="Orders", header=1)
df.to_html("out.html", index=False, border=0)
PY

pandas writes different markup and may infer types differently, so compare dates and identifiers.

Excel XLSX to HTML by API or MCP

The HTTP API and the MCP server run the exact engine this page uses (Table engine); the response carries the same warnings the web converter shows. Check support first with GET /api/v1/pairs?from=xlsx&to=html.

curl

curl -X POST https://filetypeconverters.com/api/v1/convert \
  -H "Authorization: Bearer $FTC_API_KEY" \
  -F "file=@input.xlsx" -F "from=xlsx" -F "to=html" \
  -F 'options={"sheet":""}' \
  --output output.html

Options this engine accepts for Excel XLSX → HTML

Key	Applies to	Type	Default
sheet	Reading Excel XLSX	string
headerRowIndex	Reading Excel XLSX	number	0
dateHandling	Reading Excel XLSX	date · string	date

API reference

When this is the wrong conversion

Use /convert/xlsx-to-md when the target is a README, issue comment, or other Markdown surface.
Keep XLSX when the recipient needs formulas, workbook styling, charts, filters, or more than one sheet.

Excel XLSX to HTML questions

Is XLSX to HTML a full spreadsheet preview?

No. The converter writes a plain HTML table. It does not recreate Excel's grid UI, formulas, sheet tabs, or cell styling.

Are cell values safe for HTML insertion?

The serializer escapes HTML-sensitive characters in cell names and values. You should still place the table inside your own page template and CSS.

Why did the first row become table headers?

Our table engine treats the selected header row as column names. The conversion counts toward your daily or monthly allowance like every other, and the input is deleted within 24 hours.