DOC to DOCX moves the words and leaves the layout
People search this when Word on a new computer will not open an old .doc file.
A real legacy .doc file cannot be converted in the browser. If you upload a file that is already DOCX, this page only re-saves it. For an old .doc, open it in Word or LibreOffice and use Save As DOCX.
When this DOC file should stay in the original app
Do not expect this page to recover a Word 97 document. The button will stop and tell you to save as DOCX on a computer that can open the old file.
When DOC to DOCX is the right page
DOC to DOCX sits on this site because DOC and DOCX are not interchangeable, even when they look similar in a file list. People search this when Word on a new computer will not open an old .doc file. People meet DOC on old email attachments and on forms that were never updated. Use DOCX when someone must change the wording, not only read it.
A real legacy .doc file cannot be converted in the browser. If you upload a file that is already DOCX, this page only re-saves it. For an old .doc, open it in Word or LibreOffice and use Save As DOCX.
What you give up by leaving DOC
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.
What you gain, and do not gain, with DOCX
The download has to be DOCX, because that is the format the next step named. Use DOCX when someone must change the wording, not only read it. It stores paragraphs, basic headings, and tables well enough for drafts and letters.
The useful result is editable text. Pixel-perfect Word styling is a desktop export.
A test that matches the real file
Start from the question the other software asked. If it asked for DOCX, DOC to DOCX is the matching page. If it asked for something else, switch tools instead of hoping a similar extension will pass. People search this when Word on a new computer will not open an old .doc file. A real legacy .doc file cannot be converted in the browser. If you upload a file that is already DOCX, this page only re-saves it. For an old .doc, open it in Word or LibreOffice and use Save As DOCX. The limit is the part people skip, and it is the part that decides whether the download is usable. Do not expect this page to recover a Word 97 document. The button will stop and tell you to save as DOCX on a computer that can open the old file. 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. Check three things in the download: it opens, the DOC material you cared about is still there, and the file size or the layout is what the form described. A new extension alone is not those three things. If a portal, a teacher, or a client rejects the file, send them the original DOC as well when you are allowed to. DOC to DOCX is a convenience copy. It is not a new master. Document tools on this site carry words. DOC to DOCX 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 DOCX. You start with DOC and you stop when a real program accepts DOCX. If the other side truly cannot open DOCX, a simple DOC of the words can unblock them. A browser conversion into DOCX will not rebuild text boxes, headers, or a magazine layout from a PDF. 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.
Do not expect this page to recover a Word 97 document. The button will stop and tell you to save as DOCX on a computer that can open the old file.
A related step, if you still need one, is DOCX to DOC.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.