You don't need to install an app or email the file to yourself to turn a Word document into a PDF on your phone. A modern mobile browser can do the whole job locally. Here's the shortest path on both iPhone and Android.
The quick version
- Open docx2pdf.app in Safari (iPhone) or Chrome (Android).
- Tap the drop area and choose your .docx file from Files, Google Drive, or wherever it lives.
- Tap Convert to PDF, then Download PDF.
- The PDF saves to your Downloads or Files app, ready to share.
On iPhone and iPad
Word documents on iOS usually live in the Files app, in iCloud Drive, or inside the Microsoft Word app. When you tap to choose a file, iOS opens the document picker — browse to the .docx and select it. After conversion, the downloaded PDF lands in Files → Downloads by default. From there you can tap the share icon to send it by Mail, Messages, or AirDrop.
On Android
On Android the flow is nearly identical in Chrome. The file picker pulls from your device storage and Google Drive. Converted PDFs save to your Downloads folder, and you can open or share them straight from Chrome's download bar or the Files app.
Because everything happens on the device, a weak or missing signal doesn't stop you — once the page has loaded, the conversion itself needs no connection.
If the file is large or full of images
Conversion runs on your phone's own processor, so a long, image-heavy document takes a little longer on an older device. If a big file feels slow, close other tabs to free up memory, and give it a few seconds after tapping Convert before assuming anything went wrong.