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DOCX to HTML converter

Convert Word documents to HTML

No watermarkFree & unlimited
All processing happens in your browser. No data is sent to any server.

Word documents are already XML underneath, and Mammoth reads that XML with a bias towards meaning rather than appearance. A paragraph styled Heading 2 becomes an h2, a numbered list becomes an ol, a Word table becomes a table element, and direct formatting such as typeface and point size is deliberately discarded. The page wraps the result in a complete HTML5 document with a small inline stylesheet, so what you download is one file that opens correctly on its own, with no folder of assets beside it and no stylesheet to link.

Key facts about DOCX to HTML converter

Key facts about DOCX to HTML converter
ConverterMammoth 1.12, which maps Word styles to semantic tags instead of trying to reproduce the visual layout.
Output shapeA full HTML5 document: doctype, lang attribute, UTF-8 charset, viewport meta and an inline style block.
Built-in stylingA Segoe UI and Arial stack, 1.6 line height, an 800 px centred column, and bordered tables with a grey header row.
ImagesInlined as base64 data URIs, so the file is self-contained but roughly a third larger than the binary originals.
Document titleAlways the literal string Converted Document. Edit the title element if the page will be published.
Word formatting droppedFonts, point sizes, text colours, highlighting and custom paragraph spacing are not carried into the markup.
Headers and footersNot emitted. Running heads, footer text and page-number fields have no equivalent in a flowing HTML page.
HyperlinksPreserved as anchor elements with their targets intact, unlike the PDF route where links are flattened.
Structure keptHeadings, ordered and unordered lists, tables, bold, italic, superscript and footnote references.
Input acceptedThe .docx package only. Legacy binary .doc files are a different format and are not read.
ModeFile upload only; there is no paste box, because a .docx is a ZIP archive rather than text.
Opens natively inAny browser, any code editor, and any CMS or static-site pipeline that accepts an HTML fragment or file.

What happens to your file

The Word file is read into an ArrayBuffer and unzipped by Mammoth in this browser tab. Every XML part, every paragraph of text and every embedded picture is processed by JavaScript running on your own device, and the finished HTML string is wrapped in a Blob for download. Nothing is posted to a server, which matters more here than on most conversions because the readable content of a contract or report would otherwise be transmitted in full. Reset the tool or close the tab and the extracted text is gone.

About this tool

  1. 1

    Add the Word file

    Drop a .docx onto the panel or click to open the picker. Several documents can be converted in one run.

  2. 2

    Convert

    Mammoth walks the document XML and emits semantic HTML, which is then wrapped in a standalone page.

  3. 3

    Download the .html

    Save the single file, or take a batch as one ZIP built locally, and open it in a browser to check it.

  4. 4

    Edit before publishing

    Replace the placeholder title, and move the inline style block into your own stylesheet if the page goes live.

Specs & compatibility
Input and outputTakes .docx (the Office wordprocessingml type) and returns the HTML as a blob with the text/html type, named after the file you dropped in.
EngineMammoth 1.12.0 maps the Word styles onto HTML elements and the page wraps the result in a full HTML5 document with its CSS inlined.
ModesFile mode only: DOCX to HTML has no paste box, so the DOCX arrives through the picker or a drag and drop and the HTML comes back as a download.
Batch and capsTwenty DOCX files per run at 500 MB each; several HTML results are zipped in page memory as converted-html-files.zip.
Browser and deviceDOCX to HTML needs only the File API, a Blob download and the parser already in the bundle, so every current browser behaves the same and the page keeps working with the network off.
  • Style the document properly in Word before converting. Mammoth reads styles, so a real Heading 1 becomes an h1 while text that is merely large and bold stays an ordinary paragraph.
  • Expect the file to be bigger than the .docx when it contains photographs, because base64 encoding adds about a third to every embedded image.
  • If you are pasting the output into a CMS, take only what is inside the body element. The doctype, head and style block are there for standalone viewing.
  • Footnotes become links to a list at the end of the document, which reads well on the web but does not match the page-bottom placement Word used.
  • Run the result through a formatter or a linter before committing it, since Mammoth emits compact markup with no indentation.
  • Move an article or manual written in Word into a static-site generator or a CMS without hand-retyping the structure.
  • Get clean semantic markup out of a document so a developer can restyle it, rather than inheriting Word exported markup full of spans.
  • Produce a browser-readable copy of an internal report for people who have no Office licence on their machine.
Mammoth converts meaning rather than appearance, on the reasoning that Word visual choices rarely translate well to a flowing web page. Headings, lists, tables and emphasis survive; typeface, point size, colour and manual spacing do not. The file is then styled by a small built-in stylesheet, which is why every converted document ends up looking consistent rather than looking like its original.
No. Every picture Mammoth finds is encoded as a base64 data URI and written directly into the img tag, so the download is a single self-contained file you can email or open from anywhere. The trade-off is size: base64 adds roughly a third to each image, so an illustrated document produces a noticeably larger HTML file than the .docx it came from.
Not here. The binary .doc format predates the Office Open XML package and has an entirely different internal structure that Mammoth does not read. Open the document in Word, LibreOffice Writer or Google Docs and save it as .docx, then convert that file. The picker rejects anything that is not a .docx before conversion starts.
Yes. Anchors are emitted with their href targets intact, so links to websites and email addresses remain clickable in the HTML output. This is one place the HTML route beats the PDF route from the same source, because rasterising a document to PDF pages removes the link annotations entirely and leaves only the visible text.
Very. All of it lives in one style element in the head, covering the body font stack, the centred 800 px column, heading spacing, table borders and image sizing. Delete that block and link your own stylesheet, or keep only the markup inside the body element and drop it into an existing template that already has a design.
Comments are not emitted into the output. Tracked changes are ambiguous in any automated conversion, so the safe practice is to open the document in Word, accept or reject every revision, and save a clean copy before converting. That way the HTML unambiguously reflects the text you intend to publish rather than a mixture of drafts.

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