It always seems to happen at the worst time. You are at the airport, in a café or waiting at a doctor's office, and someone asks you to send a document "as a PDF, under 2 MB". Your laptop is at home, and the file on your phone is a photo, a Word document or an enormous video. The good news is that modern phones can handle most file tasks if you know a few tricks.
Know what your phone already does
Before installing anything, check the built-in tools:
- Document scanning. Both iPhone (in the Notes and Files apps) and many Android phones (in Google Drive or the camera) can scan paper into a cropped PDF.
- Print to PDF. On most phones, opening the share or print menu and choosing "Save as PDF" turns a web page, email or document into a PDF.
- Photo format settings. iPhones save photos as HEIC by default. Setting the camera to "Most Compatible" saves new photos as JPG, which many websites accept more readily.
Handling common requests
"Please send it as a PDF"
For photos of documents, use the scanner rather than the normal camera. For a Word or Pages file, open it and use the share menu to export or print as PDF. Check the result before sending, as fonts and layouts sometimes shift.
"The file is too large"
Upload forms often limit files to 2, 5 or 10 MB. Photos straight from a modern phone can be several megabytes each, and scanned multi-page PDFs quickly add up. Options include reducing the scan quality, resizing images before combining them or running the file through a compression tool. Browser-based services such as FileOtter work in a phone's web browser, so you can compress a PDF or convert an image without installing an app.
"We can't open HEIC files"
If a website rejects an iPhone photo, convert it to JPG. Sharing the photo through the share sheet and choosing "Save as JPG" in some apps works, or use a browser converter. Changing your camera setting prevents the problem in future.
"Can you combine these into one file?"
Multiple scans or images often need to be merged into a single PDF. Many scanner apps let you add pages to one document. If you already have separate files, a merge tool in the browser can put them together in the right order.
Keep your files findable
Phones scatter files across Downloads, Photos, messaging apps and cloud folders. Create one folder in your Files app, such as "Docs to send", and save converted files there. Rename them with clear names, like "Passport-copy-2026.pdf", rather than "IMG_4823".
Watch out on public Wi-Fi
Converting and sending sensitive documents, such as ID scans or bank statements, over open café Wi-Fi carries some risk. Use mobile data or a trusted network where possible, and choose tools that clearly explain how they handle your files. Clear out the downloads folder afterwards so copies of sensitive documents are not left lying around.
Battery and storage tips
Large conversions, especially video, use battery and storage. If your phone is nearly full, conversions can fail without a clear error. Delete old downloads or offload big videos to cloud storage before starting. For video, it is often better to share a link from cloud storage than to try to shrink a long clip on the go.
Know when to wait
Phones are great for quick tasks, but some jobs are better done on a computer: editing complex spreadsheets, converting long reports with precise formatting or preparing documents for print. If the deadline allows, send a quick note saying you will provide the polished version later, and handle the urgent part from your phone.
Build a small mobile toolkit
A scanner, the share sheet's PDF option, a bookmarked browser converter and a tidy folder are enough for most situations. Set them up once, and the next time someone asks for "a PDF under 2 MB" while you are away from your desk, it will take two minutes instead of a panic.
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