Why this is harder than it should be
Both iPhone and Android can open a PDF perfectly well — tap one in Mail, Files, or a downloads folder and it renders fine. What neither does natively is let you edit it. Viewing a PDF just means drawing fixed pages on screen; turning one into an editable Word document means pulling the text and layout back out and rebuilding it as a structured .docx file, which is a different job entirely.
Search the App Store or Play Store for "PDF to Word" and you'll mostly find apps that want a subscription after the first conversion, ask for access to your entire photo library or file system just to open one document, or both. None of that is necessary for what is, underneath, a fairly simple conversion.
The simplest method: use the browser you already have
A browser-based converter runs the conversion using the same web technology your phone's browser already has built in — no separate app, no install step, nothing to keep updated. Safari on iPhone and Chrome on Android can both do this. Altto works this way: it reads the PDF and rebuilds it as a Word document directly on your phone, in the browser tab, the same way it does on a laptop.
On iPhone (Safari)
- Open altto.co.uk in Safari.
- Tap the drop zone to open the file picker, then choose Browse to get to Files, iCloud Drive, or wherever the PDF is saved — or pick it straight out of an email or Messages thread if that's where it arrived.
- Tap Convert. The page does the work in the tab itself; you'll see a short progress bar rather than an "uploading" message.
- Save the result. Tapping the download prompt saves the
.docxfile into the Files app, from where it opens directly in Word, Pages, or Google Docs.
On Android (Chrome)
- Open altto.co.uk in Chrome.
- Tap the drop zone and choose the PDF from Downloads, Google Drive, or wherever it's stored on the device.
- Tap Convert and wait for the short progress bar to finish.
- Save the file when prompted. It lands in your Downloads folder, ready to open in Word, Google Docs, or any other editor installed on the phone.
The steps are close to identical on both platforms, because it's the same browser-based process either way — there's no separate "mobile version" of the tool to learn.
Why this beats most PDF apps
A dedicated app has to ask for permissions upfront — often full photo library or file system access — to be able to reach any file you might want to convert later. A browser tool only ever touches the one file you explicitly pick through the system file picker, and for a tool with no server in its conversion path, that file never leaves the phone either. There's also nothing to keep installed, update, or eventually uninstall once you don't need it — you just leave the tab.
Where mobile conversion hits its limits
A couple of honest trade-offs are worth knowing before you rely on this for something large or unusual:
- Very large files convert more slowly. A phone's processor is doing the work instead of a data-centre server, so a PDF running into hundreds of pages will take noticeably longer than a two-page letter.
- Scanned PDFs aren't supported. If a PDF is really a photo of a page rather than real text — a scanned form, say — converting it needs OCR (optical character recognition), which is a heavier job that browser-only tools don't do. For everyday PDFs that were generated digitally — invoices, letters, contracts, essays — this isn't a factor.
Related: if the PDF is also password-protected, the same on-device approach works — the password never leaves your phone either.
Common questions
Do I need to install an app to convert a PDF to Word on my phone?
Is it safe to convert a PDF on my phone's browser instead of an app?
Why does my phone's Files or Photos app let me view a PDF but not edit it?
Try it on your phone
Open the converter in your phone's browser and pick a PDF — no app, no account, nothing to install.