DOC to DOCX Converter
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Supports: DOC
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Need help?DOC vs DOCX — Why Convert Your Old Word Files
If you have .doc files from Word 97–2003 and want them to behave like modern documents — smaller, more durable, and native to current Word, Google Docs, and Office 365 — converting to .docx is the recommended modernization step. The short version: for almost every everyday document you should move to .docx and only keep .doc if you must open the file in a pre-2007 word processor that can't read the newer format. This tool rewrites the legacy binary into the Office Open XML package without changing the visible content for typical text-and-image documents.
Side-by-side Comparison
| Property | DOC (legacy) | DOCX (modern) |
|---|---|---|
| File structure | OLE2 compound binary file (storages and streams) | ZIP package of XML parts (Office Open XML) |
| Specification | Microsoft [MS-DOC] binary format | ECMA-376 / ISO/IEC 29500 |
| Default in Word | Word 97 through Word 2003 | Word 2007 and every version since |
| Typical file size | Larger | Usually smaller (XML is ZIP-compressed) |
| Corruption recovery | Harder — damage to the binary can sink the whole file | Easier — XML parts can often be partially recovered |
| Macros (VBA) | Can embed VBA macros | Cannot — macro files use the .docm extension instead |
| Co-authoring / cloud | Limited; meant for the desktop era | Native to Google Docs, Office 365, OneDrive co-authoring |
| Best for | Opening in very old, pre-2007 software | Everyday editing, sharing, archiving, and collaboration |
When to Pick DOC
- You need to open or hand the file to a word processor older than 2007 that has no Open XML compatibility pack installed.
- A legacy line-of-business tool or template system specifically ingests the
.docbinary and rejects.docx. - You are matching an archive that is standardized on the older format and must stay byte-compatible with it.
When to Pick DOCX
- You want the smaller, more shareable file that modern Word, Google Docs, and Office 365 open natively.
- You are collaborating or co-authoring in the cloud, where
.docxis the expected format. - You want better odds of recovering content if the file is ever damaged, since the XML parts are individually readable.
- You are future-proofing an archive —
.docxis an open ISO standard, while.docis a retired binary format.
How to Convert DOC to DOCX
- Upload Your DOC File: Drag and drop your
.docfile onto the page or click "+ Add Files" to browse. You can queue several documents and convert them in one batch. - Pick a Compression Type: Leave it on "Screen (Best)" for the highest-fidelity result, or choose Ebook, Default, Prepress, or Printer if you have a specific size-versus-quality target. The defaults are tuned for everyday documents, so most users can skip this.
- Review the Output Format: The target is already set to DOCX — no extra format selection is needed for this conversion.
- Convert and Download: Click "Convert" and download your
.docxfile. No sign-up, no watermark.
Frequently Asked Questions
Will converting DOC to DOCX change how my document looks?
For ordinary documents — text, headings, tables, inline images, standard styles — the layout is preserved when it moves into the .docx package. The most likely sources of visual drift are very old files that lean on legacy WordArt, embedded OLE objects, or fonts that aren't present on the rendering machine. Open the converted file and skim it before discarding the original if the document is design-sensitive.
Does DOCX keep the macros from my DOC file?
No. The .docx format is defined as macro-free — VBA macros live in the separate .docm (macro-enabled) extension instead. Microsoft's own guidance is that saving to .docx strips the macro project. If your source .doc contains macros you need to keep, the conversion will drop them; in that case keep the original .doc or re-save it as .docm in Word. For most documents this is a benefit, since macro-free files are safer to share.
Why is the DOCX file usually smaller than the DOC?
DOCX stores the document as XML inside a ZIP container, so the markup is compressed on disk, whereas the older .doc is an uncompressed OLE2 binary. The exact reduction depends on how much text versus imagery the file holds — image-heavy documents shrink less because the pictures are already compressed — but for text-dominant files the .docx is typically the smaller of the two.
Will old versions of Word be able to open the DOCX I create?
Word 2007 and every later version open .docx natively. Word 2003 and earlier can't open it out of the box, but Microsoft published a free Compatibility Pack that adds Open XML support to those older releases. If you specifically need a file for pre-2007 software with no add-ins, that's the one case where staying on .doc makes sense — or convert the other way with our DOCX to DOC converter.
Is DOCX a real standard or just a Microsoft format?
Both. DOCX is the Office Open XML word-processing format, standardized as ECMA-376 (December 2006) and subsequently as ISO/IEC 29500. That open-standard status is part of why it's a safer long-term archive format than the legacy .doc binary, which Microsoft documents as a retired format for Word 97–2003.
Do I need to clean up the file after converting?
In our testing, a straightforward Word 97–2003 letter or report converts cleanly with no manual fixes — paragraph styles, tables, and inline images carry over as-is. The documents worth a second look are the complicated ones: heavy use of legacy drawing objects, linked OLE content, or form fields from old templates. For those, open the .docx once and confirm the affected sections rather than assuming a perfect round-trip.
What happens to my uploaded file after the conversion?
Your file is uploaded over an encrypted connection, converted on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. If you'd rather produce a fixed-layout copy for distribution instead of an editable one, you can also send the same source to our DOC to PDF converter.