Guides to private document scanning
Plain-language answers to the questions people actually have about scanner apps, sensitive documents, and keeping both under your control.
Do scanner apps upload your documents?
Where scans actually go, three ways documents leave your phone without you noticing, and how to verify what any scanner app does with your files.
Read the guide →How to redact a document on Android
Why a drawn black box fails, where text hides in a scanned document, and how to black out sensitive values so they are removed from the file itself.
Read the guide →How to back up scanned documents on Android
Why a new phone comes up empty after Google device transfer, what a backup of sensitive documents needs to contain, where to keep it, and how to restore it.
Read the guide →How to password protect a PDF on Android
Open passwords versus permissions passwords, the locks that are already broken, why free online tools upload the file first, and how to encrypt a scan on the phone.
Read the guide →How to reduce scanned PDF size on Android
Where the megabytes come from, why a JPEG quality slider often does nothing for a PDF, measured sizes at each export setting, and how to shrink a scan without uploading it.
Read the guide →The scanner these guides are written around.
Private, encrypted, and entirely on your device. Verified by a measurement you can reproduce.
