DOCX vs PDF
Updated October 12, 2026
DOCX and PDF are both "documents", but they're built for different jobs. A DOCX file is a document you're still working on. A PDF is a document that's finished.
The short answer
- Send a DOCX when the other person needs to edit, comment or track changes.
- Send a PDF when the document should look exactly the same for everyone, print correctly, or not be changed casually.
Side by side
| DOCX | ||
|---|---|---|
| Made for | Writing and editing | Sharing, printing and archiving |
| Layout | Reflows; depends on fonts on each computer | Fixed; fonts usually embedded |
| Editing | Easy in Word, Google Docs, LibreOffice | Limited; best for comments and form filling |
| Track changes, comments | Built in | Comments only |
| Opens on any device | Needs a word processor or web app | Built into every browser and phone |
| Forms | Not designed for it | Fillable form fields |
| Standard | ECMA-376, ISO/IEC 29500 | ISO 32000 |
Common situations
| Situation | Send |
|---|---|
| A draft for a colleague to edit | DOCX |
| A contract or agreement to sign | |
| A resume or cover letter | PDF, unless the posting asks for Word |
| A school assignment | Whatever your teacher or course site asks for; PDF if either works |
| An invoice or receipt | |
| A template others will fill in and reuse | DOCX |
Converting DOCX to PDF
If you have Word, File → Save as → PDF gives a PDF that matches your screen. Without Word, our Word to PDF converter does it in your browser, without uploading the document. It uses metric-compatible fonts in place of Calibri, Cambria, Arial and Times New Roman to reduce layout changes, but line and page breaks can still differ. Why fonts change when you convert Word to PDF explains the details.
Going the other way
Turning a PDF back into an editable Word document is much harder, because a PDF stores the finished layout rather than paragraphs and styles. If you only need to change a few things, it's usually easier to comment on the PDF in the PDF editor, or to edit the original DOCX in the Word editor and convert it again.