How can I scan a document without uploading it anywhere?
Use an app that does the work on the phone rather than on a server. PDF Scanner captures with the iPhone camera and runs cropping, perspective correction and text recognition on the device using Apple's built-in frameworks, so document images are not uploaded anywhere. The simplest way to confirm any scanner's behaviour is to put the phone in airplane mode and scan — if the app still captures, corrects, runs OCR and exports a PDF, the processing was local.
The short version
- PDF Scanner performs capture, cropping, perspective correction and OCR on the iPhone using Apple's built-in frameworks.
- Document images are not uploaded to a server.
- Because processing is local, the full scan-to-PDF flow works in airplane mode.
- No account is required to start scanning.
- PDF and JPG export are free and add no watermark.
- Sharing a finished file is a separate, deliberate action you take — it is the only point at which a scan leaves the device.
- Requires iOS 16 or later.
Step by step
-
Turn on airplane mode before you test
This is the honest test of any scanner app. With no connection available, an app that depends on server-side processing cannot hide it.
-
Scan a page as you normally would
Capture the page, let edge detection do its work, and check the result. Local processing behaves identically offline and online.
-
Run the correction tools
Crop and perspective fix, rotate, and brightness and contrast should all respond immediately with no connection.
-
Run OCR while still offline
Text recognition is the step most likely to be server-side in other tools. In PDF Scanner it uses Apple's on-device recognition, so it works with the radios off.
-
Export the PDF and confirm it is complete
A finished, watermark-free PDF produced with no network connection is proof the whole pipeline ran on the phone.
Frequently asked
- How do I know an app is not uploading my documents?
- Test it in airplane mode, and read the app's privacy disclosure on its App Store listing. An app that needs the network to crop a page or recognize text is doing that work somewhere else.
- Does anything leave the phone at all?
- Only what you deliberately send. When you share a PDF by message, mail or AirPrint, that file goes where you send it — that is a transfer you initiate, not background upload of your scans.
- Why does on-device processing matter?
- Because of what people actually scan — passports, ID cards, contracts, medical paperwork, bank statements. Keeping the images on the device removes an entire category of question about who else holds a copy.
- Is on-device OCR less accurate than server OCR?
- For printed type it is strong. The real limits are the same either way — handwriting, glossy laminates and curved book gutters degrade recognition regardless of where it runs. PDF Scanner covers auto-detect, Latin, Korean, Chinese (Simplified) and Japanese scripts.
- Do I need an account?
- No. There is no sign-up before scanning or exporting.
Last updated 2026-07-28