DOC to HTML moves the words and leaves the layout
You want the writing from a Word file on a web page or in a CMS.
The document text, and simple HTML if the file has it, is wrapped in a small HTML page. It is not a pixel copy of the Word layout.
When this DOC file should stay in the original app
Headers, text boxes, and SmartArt will not survive. Read the HTML before you publish it.
DOC to HTML without the extra promises
DOC to HTML sits on this site because DOC and HTML are not interchangeable, even when they look similar in a file list. You want the writing from a Word file on a web page or in a CMS. People meet DOC on old email attachments and on forms that were never updated. Writers move HTML into a CMS, or wrap extracted text so a browser can show it.
The document text, and simple HTML if the file has it, is wrapped in a small HTML page. It is not a pixel copy of the Word layout.
Read this about DOC before you upload
DOC is the Word format from before 2007. A few portals and older PCs still ask for it. Browsers cannot read a real Word 97 binary document, and they cannot write a certified legacy DOC with full styling.
If you still have the DOCX, keep it. DOC is a compatibility copy.
Read this about HTML before you send the download
The download has to be HTML, because that is the format the next step named. Writers move HTML into a CMS, or wrap extracted text so a browser can show it. Headings and paragraphs survive when the source was simple.
Expect a readable page, not a screenshot of the original document.
Keep, check, then delete
People lose time when they convert before they know which rule failed. Size, pixel dimensions, codec, font encoding, and layout are different rules. DOC to HTML only addresses the DOC to HTML step. You want the writing from a Word file on a web page or in a CMS. The document text, and simple HTML if the file has it, is wrapped in a small HTML page. It is not a pixel copy of the Word layout. Headers, text boxes, and SmartArt will not survive. Read the HTML before you publish it. The file stays in your browser and is not uploaded. The limit is 100 MB. Keep the original until the download has been opened in the program that will use it. Do the test with a short or simple file first when the real file is large. A one-page PDF, a single photo, or a one-minute clip will show you whether the output is the kind of file you needed. After that test looks right, run the real file once. Keep both the DOC original and the HTML download until the receiving person or the upload form accepts it. Document tools on this site carry words. DOC to HTML will not clone a brochure, a letterhead, or floating images. If the page has to look exact, export from Word, Google Docs, or LibreOffice. Use this download for a draft, a paste, or a simple handoff, and keep the file you can still edit.
Here is the decision for DOC to HTML. You start with DOC and you stop when a real program accepts HTML. If the other side truly cannot open DOCX, a simple DOC of the words can unblock them. It is a poor way to preserve a print layout, scripts, or a designed brochure. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
Headers, text boxes, and SmartArt will not survive. Read the HTML before you publish it.
A related step, if you still need one, is HTML to DOC.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.