You're on the way to a meeting, someone needs the proposal as a PDF, and the only copy is the DOCX on your phone. iOS doesn't have native Word-to-PDF unless you have the Word app.
Save the DOCX to Files
From Mail, Messages, or wherever the DOCX lives, share > Save to Files. Pick a folder you'll find again — Files > On My iPhone, or iCloud Drive.
Convert in Safari
Open Flint's Word to PDF in Safari. Tap the upload area, choose Browse, pick the DOCX from Files. Conversion runs server-side; the PDF downloads back into Files.
No app installs, no subscription, no signup.
Open or share the PDF
Tap the PDF in Files to preview, share it from the share sheet, or open in any PDF viewer (Books, Adobe Acrobat Reader, GoodReader). For email or messaging, share directly from Files — no need to open first.
When the Word app makes more sense
If you create or edit DOCX files daily on iPhone, the Word app's built-in PDF export is convenient. For one-off conversions where you don't otherwise use Word, the browser path is faster and adds no app to your phone.
FAQ
Is there a file size limit on mobile?
Same generous limit as desktop. Mobile network speed is more of a practical limit — Wi-Fi handles bigger files faster.
Will it work on cellular?
Yes — but large DOCX files upload slowly on 4G. Wi-Fi recommended for anything over 20MB.
Can I AirDrop the PDF?
Yes — tap and hold the PDF in Files, Share > AirDrop.
What about iPad?
Same flow. Safari + Files on iPad works the same way. The bigger screen makes it slightly less fiddly.
Phone, browser, PDF. Convert your Word to PDF without installing anything.