FairScan

An Android app to scan your documents —
simple and respectful.

Get it on: F-Droid · Google Play · GitHub

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FairScan is an Android app to scan documents quickly, easily and privately.

It's designed to be simple: users get a clean, shareable PDF in seconds, with no manual adjustments.
And respectful: open source, minimal permissions, no tracking, no ads.

• Website: https://fairscan.org
• Blog: https://fairscan.org/blog/

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Screenshots

Scan	Preview	Save & Share

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Features

• Clear, distraction-free interface
• Easy scanning process: scan → preview → share
• Automatic document detection using a custom segmentation model
• Automatic perspective correction
• Automatic image enhancement
• Fast PDF generation with no manual adjustments
• Fully offline – the app has no internet permission
• Minimal permissions
• Open source, GPLv3

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Compatibility

FairScan works on any device that:

• runs Android 8.0+
• has a camera

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Technical details

FairScan uses:

• Jetpack Compose for the UI
• CameraX for image capture
• LiteRT to run the custom segmentation model for automatic document detection
• OpenCV for perspective correction and image enhancement
• PDFBox-Android for PDF generation

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The segmentation model

FairScan uses a custom-trained image segmentation model to detect documents:
https://github.com/pynicolas/fairscan-segmentation-model

It's based on a fully public dataset that is available here:
https://github.com/pynicolas/fairscan-dataset

The build system automatically downloads the model using
download-tflite.gradle.kts.

Related blog posts:

• Making document detection more reliable
• Building a public dataset for FairScan

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Build

To build an APK:

./gradlew clean check assembleRelease

To build an Android App Bundle:

./gradlew clean check :app:bundleRelease

License

This project is licensed under the GNU GPLv3. See LICENSE for details.