Is there a scanner app that works offline?
Yes. PDF Scanner works with no internet connection because everything it does happens on the phone — edge detection and capture, cropping and perspective fix, brightness and contrast, OCR, and PDF or JPG export all run on the device using Apple's built-in frameworks. The only step that needs a connection is sending the finished file, and that is something you choose to do afterwards.
The short version
- Capture, cropping, perspective correction, contrast adjustment, OCR and PDF or JPG export all run on the iPhone.
- The app requires no network connection to produce a finished, watermark-free PDF.
- Document images are not uploaded to a server.
- No account is required, so there is no sign-in step that would need a connection.
- OCR is on-device and covers auto-detect, Latin, Korean, Chinese (Simplified) and Japanese scripts.
- Sharing or printing a finished file is the only step that involves a network or a nearby printer.
- Requires iOS 16 or later.
Step by step
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Put the phone in airplane mode
This proves the point rather than taking anyone's word for it — and it is also a genuine use case on a plane, in a basement archive, or abroad without data.
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Scan the pages you need
Edge detection and capture behave identically offline. Nothing waits on a server round trip.
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Correct and run OCR
Crop and perspective fix, rotate, brightness and contrast, and text recognition all respond immediately with the radios off.
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Export the PDF
A complete, unwatermarked PDF produced with no connection is the whole offline workflow, finished.
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Share it when you are back online
The file sits on the device until you send it. Reconnect and share by message, mail or AirPrint whenever it suits.
Frequently asked
- Does OCR need an internet connection?
- No. Text recognition uses Apple's on-device frameworks, so it runs in airplane mode like the rest of the pipeline.
- Why do some scanner apps stop working offline?
- Because parts of their pipeline run on a server — commonly text recognition, image enhancement or file conversion — or because they require you to be signed in to an account. Both create a dependency on a connection.
- Do I lose any features offline?
- The scanning workflow is complete offline. What you cannot do without a connection is send the file to someone, which is true of any file on any device.
- Is offline the same as private?
- They are related but not identical. Working offline proves the processing is local; the privacy claim that matters is that document images are not uploaded to a server, which is what makes the offline behaviour possible.
- Do I need an account to use it offline?
- No. There is no sign-up before scanning or exporting, so there is nothing to authenticate against.
Last updated 2026-07-28