Convert DOC to DOCX Online
Turn Word files into Word output online. The service is free, requires no account, supports batch queues, and limits server uploads to 100 MB per file. The conversion runs on the server in an isolated request. Keep the original file while you review the converted copy.
Convert .DOC to .DOCX
Select a file to begin. Processing details and limits are listed below.
How to convert DOC to DOCX
- 1
Choose Word files
Add one or more Word files to the queue. The uploader keeps batch items separate.
- 2
Set the Word options
Set the available quality or format options, or keep the defaults for a first pass.
- 3
Convert and download
Run the queue and download the Word files individually or together as a ZIP.
Legacy Microsoft Word vs Microsoft Word Open XML document
| Spec | Legacy Microsoft Word | Microsoft Word Open XML document |
|---|---|---|
| MIME type | application/msword | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Format type | document | document |
| Standard | Pending review | ECMA-376 / ISO/IEC 29500 Office Open XML |
| First release | Pending review | 2007 |
| Browser support | Pending review | Google Docs, Office for the web, and other browser editors |
| Contents | Binary word processing format. | ZIP package of XML parts for paragraphs, styles, relationships, images, headers, and document settings. |
About Legacy Microsoft Word
Binary word processing format.
About Microsoft Word Open XML document
Editable, structured, widely supported by office suites, and much easier to revise than a fixed-layout PDF. Layout can shift between Word, LibreOffice, and web editors; fonts and complex objects may not render identically.
Format referenceWhy convert DOC to DOCX?
- Converting first can make layout review, approval, and downstream processing more predictable.
- A converted copy is useful when the original must remain untouched for records.
- Teams with different software can work from the same source without installing every editor.
- A separate output preserves the original while the converted copy moves into a different workflow.
Will quality change?
The document is rebuilt in Word, so layout fidelity depends on fonts, tables, columns, and complex objects. The original source remains the best reference for comparison.
Processing and limits
- Processing
- Server-side
- Engine
- LibreOffice and document tooling
- Maximum size
- 100 MB per file on the server.
- Batch support
- Yes, multiple files can be queued; completed results can be downloaded as a ZIP.
- Quality controls
- Options can adjust page range.
The file is processed on the server because the conversion requires a server-side engine or a utility operation.
- Layout can shift between Word, LibreOffice, and web editors; fonts and complex objects may not render identically.
- The output is re-encoded, so keep the original source as the archive copy.
- Browser-first paths depend on local codec support; unsupported cases fall back to the server.
Platform compatibility
The output format is supported by google docs, office for the web, and other browser editors. Desktop and mobile compatibility still depends on the specific application, so test critical files.
When not to convert
- Skip the conversion when the destination already accepts Word and no compatibility problem exists.
- For a one-off preview, a local viewer may be faster than creating a new delivery file.
- If Word support is uncertain on the destination device, test a sample before processing a large batch.
Frequently asked questions
- Can I convert Word to Word without installing software?
- Upload a Word file, choose the available Word options, run the conversion, and download the result. The tool is free, supports batches, and accepts server uploads up to 100 MB.
- Does Convert DOC to DOCX require an account?
- It is free, requires no account, and adds no watermark. Server uploads are limited to 100 MB per file, and browser-first paths are limited by device memory.
- Will quality change?
- The document is rebuilt in Word, so layout fidelity depends on fonts, tables, columns, and complex objects. The original source remains the best reference for comparison.
- Where is the file processed?
- Yes. This conversion uses a server-side engine, so the file is uploaded over HTTPS, processed in an isolated request, and removed after the result is produced.
- Can I convert several files at once?
- Queue multiple files, run them together, and download the finished results as a ZIP. Each server file is limited to 100 MB, and large batches may take longer.
- What can go wrong?
- Open the downloaded Word file in the application or database you plan to use, check the structure against the source, and keep the original until the output is approved.