DOC to DOCX
Free DOC to DOCX converter online. Upgrade legacy Word DOC files to the modern DOCX format instantly. No signup, no software install required. Convert up to 100MB free.
Drop your file here, or browse
Accepts: application/msword, .doc · Max 100MB (free)
Your files are encrypted with TLS and automatically deleted after conversion.
Simply upload your .DOC file and we'll convert it to .DOCX format — fast, free, and secure.
Fast & Free
Convert files up to 100MB at no cost. No account needed.
Secure
Files are encrypted and automatically deleted after conversion.
High Quality
Industry-leading conversion with no quality loss.
How to Convert DOC to DOCX
Upload Your File
Click the upload area above or drag and drop your .DOC file. We support files up to 100MB on the free plan.
Choose Output Format
Select .DOCX as your target format. Adjust any conversion settings if needed.
Download Your File
Click Convert Now and wait a few seconds. Once complete, download your converted file instantly.
About DOC to DOCX
FluidConvert's DOC to DOCX tool lets you convert .DOC files to .DOCX format quickly and easily, right in your browser. No software installation required — just upload your file, click convert, and download the result.
Our converter uses cloud-based processing to ensure fast, high-quality conversions. Your files are encrypted during transfer and automatically deleted from our servers after conversion, so your data stays private and secure.
Whether you're converting files for work, school, or personal use, FluidConvert handles it all. Free users can convert files up to 100MB with 10 conversions per day. Need more? Our Pro plan offers 1GB file sizes and 100 daily conversions.
Frequently Asked Questions
Is the DOC to DOCX free?
Yes! FluidConvert lets you convert .DOC files to .DOCX completely free, with no account required. Free users can convert files up to 100MB with 10 conversions per day.
How long does it take to convert DOC to DOCX?
Most files are converted in just a few seconds. Larger files may take a bit longer depending on file size. Our cloud servers handle the processing so your computer stays fast.
Do I need to install any software?
No. FluidConvert works entirely in your browser. Just upload your file, choose the output format, and download the result. Works on Windows, Mac, Linux, and mobile devices.
Is my file safe and private?
Absolutely. All files are encrypted during transfer using TLS. Your files are processed on secure servers and automatically deleted after conversion. We never access, share, or store your files.
What is the maximum file size I can convert?
Free users can convert files up to 100MB. Pro users get up to 1GB, and Business users can convert files up to 5GB. Upgrade anytime for larger file support.