Convert Excel Spreadsheet (Legacy) to HTML Online Free

Drag & drop your .xls file here, or click to browse

Converts to HTML on secure servers · first daily conversion free · no signup

Your first conversion each day is free. A $2.99 one-time Day Pass unlocks 24 hours and ends by itself.

Convert legacy Excel XLS spreadsheets to HTML to publish tabular data on the web, migrate old spreadsheet content to CMS platforms, and share data in any browser.

By ChangeThisFile Team · Last updated: March 2026

Quick Answer

ChangeThisFile converts your legacy Excel Spreadsheet to HTML using LibreOffice on our secure servers, exporting cell data, formatting, and table structure from the binary XLS format as a web-ready HTML file. Perfect for publishing legacy spreadsheet data online. Encrypted upload, automatic file deletion, completely free with no signup required.

First daily conversion free No signup required Encrypted transfer · Async jobs kept up to 24h Queued when needed Updated May 2026

Excel Spreadsheet (Legacy) vs HTML: Format Comparison

Key differences between the two formats

Feature	Excel Spreadsheet (Legacy)	HTML
Format type	Binary Compound File (.xls)	Web markup language
Specification	Microsoft BIFF binary format	W3C HTML Living Standard
Introduced	Excel 2.0 (1987)	1991
Primary use	Legacy data analysis and calculations	Web publishing and data display
Rendering	Spreadsheet application required	Any web browser, no software needed
Calculations	Live Excel formulas	Static computed values
Max rows	65,536 rows	Unlimited (static data)

When to Convert

Common scenarios where this conversion is useful

Publishing old XLS data to the web

Convert legacy XLS spreadsheets to HTML tables for embedding on websites and web portals, making the data accessible without requiring Excel.

Migrating legacy data to web platforms

Extract old XLS data into HTML format for import into modern web-based data management systems, wikis, and CMS platforms.

Intranet reporting from legacy files

Publish old XLS-based reports to intranet web pages so teams can view the data in a browser without needing legacy Excel installations.

Email marketing data tables

Convert XLS data tables to HTML for use in email marketing campaigns and newsletters through platforms like Mailchimp or HubSpot.

Historical data archival

Preserve historical XLS datasets as HTML for long-term browser-accessible archival that doesn't depend on legacy spreadsheet software.

Who Uses This Conversion

Tailored guidance for different workflows

Developers

Convert Excel Spreadsheet (Legacy) config files to HTML for compatibility with different tools or frameworks
Transform Excel Spreadsheet (Legacy) API responses to HTML for debugging, logging, or documentation

Validate the converted HTML output with a linter to catch any structural issues from the conversion

Watch for data type coercion (e.g., numbers becoming strings) when converting between Excel Spreadsheet (Legacy) and HTML

Data Analysts

Convert Excel Spreadsheet (Legacy) exports to HTML for importing into spreadsheet software, databases, or BI tools
Transform Excel Spreadsheet (Legacy) datasets to HTML for sharing with teammates who use different analysis tools

Check that column delimiters and quote escaping are handled correctly in the converted HTML file

Preview the first few rows of the HTML output to verify headers and data alignment

System Administrators

Convert Excel Spreadsheet (Legacy) configuration to HTML when migrating between infrastructure tools or platforms
Transform Excel Spreadsheet (Legacy) log exports to HTML for ingesting into monitoring or analysis systems

Back up the original Excel Spreadsheet (Legacy) config before converting, especially for production systems

Test the converted HTML in a staging environment before deploying to production

How to Convert Excel Spreadsheet (Legacy) to HTML

1

Upload your Excel Spreadsheet (Legacy) file

Drag and drop your .xls file onto the converter, or click to browse. Files up to 50 MB are supported for free.
2

Server-side conversion with LibreOffice

Your file is securely uploaded and converted on our servers using LibreOffice Calc headless, reading the binary XLS format and exporting cell data as structured HTML tables.
3

Download the result

Once conversion is complete, click Download to save your .html file. The uploaded file is automatically deleted from our servers.

Automate this conversion

Convert Excel Spreadsheet (Legacy) to HTML via API

Integrate this conversion into your pipeline with 3 lines of code. Free tier: 25 conversions/month.

curl -X POST https://changethisfile.com/v1/convert \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -F "file=@input.xls" \
  -F "target=html" \
  -o output.html --fail

const form = new FormData();
form.append('file', fileInput.files[0]);
form.append('target', 'html');

const res = await fetch('https://changethisfile.com/v1/convert', {
  method: 'POST',
  headers: { 'Authorization': 'Bearer YOUR_API_KEY' },
  body: form
});
const blob = await res.blob(); // your converted HTML file

Replace YOUR_API_KEY with your free key — no credit card needed.

Get a free API key

Frequently Asked Questions

Is the Excel Spreadsheet (Legacy) to HTML conversion free?

Yes, completely free. Convert XLS to HTML with no cost, no signup, and no watermarks.

What does the HTML output look like?

LibreOffice exports an HTML file with HTML table elements representing the spreadsheet. Cell formatting, colors, and borders are preserved as inline CSS styles.

Are XLS formulas included in the HTML output?

No. Formulas are evaluated before conversion and the HTML contains computed cell values only. HTML is a static format and cannot execute spreadsheet formulas.

Will all sheets in the XLS be exported?

LibreOffice typically exports multiple sheets in the HTML output. The active or first sheet is prioritized, with other sheets included as separate sections.

Will cell colors and borders be preserved?

Yes. Cell formatting including colors, borders, fonts, and number formats are preserved as inline CSS styles in the HTML output.

Is my file kept on your servers?

No. Files are automatically deleted immediately after conversion. Nothing is stored or retained.

Is the transfer secure?

Yes. Files are transferred over encrypted HTTPS connections. Your data is protected in transit.

What technology powers this conversion?

The conversion uses LibreOffice Calc headless on our servers. LibreOffice has extensive XLS binary format support and a reliable HTML export filter.

Can I use the output HTML table directly in a webpage?

Yes. You can extract the table from the output HTML and embed it in your own webpage, applying your own CSS to match your site's design.

What is the maximum file size?

Files up to 50 MB are supported for free conversion.

Related Conversions

Related Tools

Free tools to edit, optimize, and manage your files.

Data Prettify Data Validate Merge CSV

Read our guides on file formats and conversion

Ready to convert your file?

Convert Excel Spreadsheet (Legacy) to HTML instantly — free, no signup required.

Start Converting