Convert OpenDocument Text to HTML Online Free

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

Converts to HTML on secure servers · 1 free a day, files up to 25 MB · no signup

Your first conversion each day is free (files up to 25 MB). A $2.99 one-time Day Pass unlocks 24 hours and ends by itself.

Convert OpenDocument Text to HTML for seamless web publishing, CMS integration, and extracting LibreOffice document content into the open web.

By ChangeThisFile Team · Last updated: October 2026

Quick Answer

ChangeThisFile converts your OpenDocument Text document to HTML using LibreOffice on our secure servers, exporting headings, paragraphs, lists, tables, and inline styles as structured web-ready HTML. Ideal for publishing LibreOffice documents to the web or CMS platforms. Encrypted upload, automatic file deletion, free for one conversion a day with no signup required.

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

OpenDocument Text vs HTML: Format Comparison

Key differences between the two formats

Feature	OpenDocument Text	HTML
Format type	XML word processing container (.odt)	Web markup language
Specification	ISO/IEC 26300	W3C HTML Living Standard
Primary use	Document editing (LibreOffice, OpenOffice)	Web publishing and display
Rendering	Office application required	Any web browser, no software needed
Styling	Paragraph styles and character styles	CSS classes and inline styles
Content flow	Page-based layout	Reflowable web layout
Interactivity	Macros and form controls	JavaScript and web APIs

When to Convert

Common scenarios where this conversion is useful

Publishing LibreOffice documents to the web

Convert ODT documents written in LibreOffice Writer directly to HTML for publication on websites, blogs, and online platforms.

CMS content import

Import ODT document content into WordPress, Ghost, Drupal, or any HTML-accepting CMS by converting to HTML first.

Open-source documentation workflows

Many open-source projects write documentation in ODT and convert to HTML for web-based documentation portals and wikis.

Email campaign content

Extract rich formatted text from ODT documents into HTML for use in email marketing platforms and newsletter tools.

Web accessibility and reach

Convert ODT content to HTML so it can be read by anyone with a browser, without requiring LibreOffice or any office software installed.

Who Uses This Conversion

Tailored guidance for different workflows

Developers

Convert OpenDocument Text config files to HTML for compatibility with different tools or frameworks
Transform OpenDocument Text 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 OpenDocument Text and HTML

Data Analysts

Convert OpenDocument Text exports to HTML for importing into spreadsheet software, databases, or BI tools
Transform OpenDocument Text 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 OpenDocument Text configuration to HTML when migrating between infrastructure tools or platforms
Transform OpenDocument Text log exports to HTML for ingesting into monitoring or analysis systems

Back up the original OpenDocument Text config before converting, especially for production systems

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

How to Convert OpenDocument Text to HTML

1

Upload your OpenDocument Text file

Drag and drop your .odt 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 headless, exporting the ODT content through LibreOffice's HTML filter.
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 OpenDocument Text 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.odt" \
  -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 OpenDocument Text to HTML conversion free?

Your first conversion each day is free, with no signup and no watermark, for files up to 25MB. For more conversions the same day or files up to 100MB, a one-time $2.99 Day Pass unlocks unlimited conversions for 24 hours. No account or subscription is needed.

What does the HTML output look like?

LibreOffice generates a complete HTML file with inline CSS styles preserving paragraph formatting, fonts, headings, lists, and tables from the ODT document.

Will ODT heading styles become HTML heading tags?

Yes. Heading 1, Heading 2, and other ODT heading styles are converted to the corresponding h1, h2, and other HTML heading elements.

Can I paste the converted HTML into a CMS?

Yes. You may want to clean up verbose inline styles before pasting if your CMS uses its own stylesheet — but the structure and content will be accurate.

Will tables be preserved as HTML tables?

Yes. ODT tables are converted to HTML table elements with cell content and basic formatting preserved via inline styles.

Is my file kept on your servers?

Only briefly. Files up to 15MB are deleted as soon as the converted file is sent back; larger files run as a background job and are deleted automatically about a day later.

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 headless on our servers. LibreOffice's native ODT format support ensures accurate and complete HTML export.

How are images in the ODT handled?

Images from the ODT are typically output alongside the HTML as separate files, with the HTML referencing them as relative paths.

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.

PDF Merge PDF Split PDF Compress Data Prettify Data Validate Merge CSV

Read our guides on file formats and conversion

Ready to convert your file?

Convert OpenDocument Text to HTML instantly — free, no signup required.

Start Converting